New project I have some ???s

[M5-]

I guess this will be an introduction as well as a request for some help. I picked up this 65 stepper a few months ago as I've had my eye on it for several years and the guy finally put it up for sale so I bought it. All and all the truck is pretty solid as it has spent its entire life in Montana. My questions are currently related to the engine. I'll tell you what I have and maybe you guys might be able to figure it out.

The original build sheet is in the seat and it lists the engine code as "UH" which from my research means the truck came with a 292. On the build sheet there is a line entry "4L25AD Optional 170 HP engine" as well as one for the 4 speed which it has. I can't find any reference to a 170 HP engine any place. To further complicate the issue the casting number on the block is 38877178 which can be a Buick/Olds/Chev/Pont/GMC 230-250 from 62-78. Clearly the engine is not a 292 and to verify that I checked the block stamping which is F0414TF which should mean its a 250 built on the 14th day of April in Flint. The date code on the block is D 12 5 which should mean the block was cast on the 12th day of April either 1965 or 1975. The last 6 digits of my VIN are 143503 which I would think means the truck was built in late 65 almost 66. GM switched to the 250 in 66 could they have installed a 170 HP 250 back in 65?. If my engine was a 250 from 1975 it should have the integral head/intake manifold. So I thought OK I'll just look up the head casting number but all I can find on the head is 4888F7. Where should I be looking for the head casting number?

Thats probably enough questions at once. If anybody can help me out that would be fantastic. Here are some pics.


Thx
Paul

[M5-]

Couple more pics

M5

[raycow]

Unless someone did a lot of parts swapping, that is a believeable looking 1965 engine. It has open PCV and a Rochester model B carb. Naturally, I would very much like to see a pic of the passenger side below the pushrod cover. Actually, I just need to see a pic that shows the fuel pump and the mount.

Assuming for the moment that it's not a 292, the most likely explanation is that a PO swapped it in because he needed an engine and this 230 was available. No production 250s were built as early as April 1965, and no production 250 from this time period was rated at 170 hp.

I believe the build sheet, assuming you matched it to the truck's VIN. If you know that code UH means a 292, then 170 hp is about right for the 292 in those days. I am still looking for a brochure from around 65 that lists hp ratings, and I will post here as soon as I find one.

Lastly, if you can't find a casting number anywhere on the outside of the head, I think the next best place to look would be under the valve cover. If you are wanting the casting number to find out if it is an integral head, it isn't.

A more interesting mystery (at least to me) is why the valve cover, pushrod cover, and intake manifold are yellow and the block and head are green.

Ray

[raycow]

Here ya go - 170 hp from 1964.

http://www.oldcarbrochures.com/main.php?g2_itemId=47905

Ray

[M5-]

Thanks for the help, its starting to maybe make some sense. Could it be the original 292 top end on a 1975 250 bottom end maybe?

I wish I was at home right now and I would post some more pics but I'm at work and I'm leaving town till Wednesday. As far as the green and yellow thing goes I'm thinking farmer with John Deere stuff. Somebody has been into the engine at some point for sure as there is orange silicon all over the place. I'm not too familiar with these engines but to me the rocker plates on the side look like 230/250 size not the taller 292 ones. I will post a pic when I get a chance. The stamping code next to the distibutor also points to 250 being that it ends with code TH or at least thats what I've read in a few places including the LMC catalog which I wouldn't take to the bank. The casting number on the block decodes to 250 as well from what I have read.I found the page below on here and that's where I got the UH thing from to match to the build sheet. I'm sure the build sheet is original but I haven't tried to get it out as it looks like it's about as delicate as an ancient scroll from an Indiana Jones movie, I'm afraid it'll turn to dust.

Maybe when I get home I'll pull the rocker cover and see what it has for a head.

Thanks again
Paul

[M5-]

Here's a few more pics to help with the ID. I can get whatever pics will help.

Thx Paul

[M5-]

OK

I pulled the rocker cover and the head casting number is 3864886 which codes out to a 230 head. The Date code is D 13 5 which is a reasonable match to the block date code. Again my confusion is with the TF (Supposed to be a 250) Suffix code on the block plate and the UH code on the build sheet meaning 292.

Thx Paul

[ljackson]

Here is some good info on engine ID. http://67-72chevytrucks.com/vboard/s...d.php?t=412949

[M5-]

From looking at your link everything points to a 65 230 except the TF code on the suffix plate. Are there any decent sources for decoding the suffix plate with a bit more accuracy other than the LMC catalog?

Thx

[M5-]

After a quick check my starter has 3 bolts if that helps anybody.

Thx Paul

[Martin64]

Except for the John Deere color scheme, that motor is pretty much identical to the 230 I currently have in my truck.

[raycow]

Originally Posted by M5-

Here's a few more pics to help with the ID. I can get whatever pics will help.

From your pics, the engine is either a 230 or 250, and the casting date nails it as a 230. A 292 would have the fuel pump located to the rear of the mount instead of in front of it. As for the TF suffix, GM often used the same code for multiple years, which is why you sometimes need the casting date in order to insure positive identification.

On the evidence of your build sheet, it is almost a certainty that the truck had a 292 as built. That engine probably failed at some point and the owner decided it was more expedient or cost-effective to replace it instead of doing a repair or rebuild.

The one aspect that still has me puzzled is the yellow external parts. While the valve cover and manifold could have been transferred from the 292, the pushrod covers would have been too tall to fit a 230. Do you think the truck might have had three engines during its lifetime?

Ray

[M5-]

Well I'm convinced it's had at least 2 engines. The Old Car Brochures link isn't working right now but if I remember when I read it after you posted it the 170 HP 292 had some revolutionary aluminum main bearings or something like that which I suspect failed in short order hence the replacement.

I replaced the valve seals this weekend which really reduced the smoking. The motor hasn't really been run in 5 or 6 years. I'm just kinda trying to decide what to do engine wise. I have quite a few options open to me from stock 350 to turboing the 230, a 6.0 L Lq4 LS based engine, a 377 Keith Black stroker or several different big blocks. A buddy of mine has probably 20 motors sitting around all I have to do is pick one. If the six was a 250 I'd more inclined to throw a turbo on it and do a simple blow thru system for a while as everybody has a small block. Keeping the original six would have been pretty cool but I don't think this is the original six although it may be a period correct 230.

Paul

[M5-]

I clipped the following list from another site and like all the sites the TF code doesn't show up till the 66 model year and only in the trucks. I'ts a 250 with HD 4 spped transmission which my truck has. Sooo I'm pretty convinced my block is from 65. My VIN being so high, 43000 or so I'm starting to think maybe I have a truck with one of the first 250's ever built. Maybe I'm just on crack. LOL

Paul






engine codes
Same as with the other figures, these are condensed from a few Chilton's manuals and dont encompass nearly all of the codes out there. Some codes also apply to more than one model or model year.

1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982

1962
Chevy II/Nova
H - 194cid w/3-speed manual
HB - 194cid w/3-speed, heavy duty clutch
HF - 194cid w/Powerglide
HG - 194cid w/Powerglide

1963
Chevy II/Nova
H - 194cid w/3-speed manual
HB - 194cid w/3-speed, heavy duty clutch
HF - 194cid w/Powerglide
HG - 194cid w/Powerglide
HL - 194cid w/3-speed manual (Taxi)
HM - 194cid w/Powerglide (Taxi)

trucks
N - 230cid w/manual trans
ND - 230cid w/Powerglide
NE - 230cid w/manual trans
NE - 230cid w/TH350
PG - 292cid w/manual trans
PK - 292cid w/Powerglide

1964
Chevy II/Nova
BT - 230cid w/Powerglide
BU - 230cid w/Powerglide, PCV
H - 194cid w/manual trans
HB - 194cid w/manual trans, heavy duty clutch
HF - 194cid w/Powerglide
HL - 194cid w/manual trans (taxi)
HM - 194cid w/Powerglide (taxi)
HT - 194cid w/manual trans, PCV (taxi)
HU - 194cid w/Powerglide, PCV (taxi)
LP - 230cid w/3-speed manual
LR - 230cid w/manual trans
OK - 194cid w/3-speed manual
OM - 194cid w/3-speed manual, heavy duty clutch
OQ - 194cid w/3-speed manual (Taxi)
OR - 194cid w/Powerglide
OT - 194cid w/Powerglide (Taxi)
PV - 230cid w/3-speed manual
PX - 230cid w/Powerglide

Chevelle/Malibu
BE - 230cid w/Powerglide
BL - 230cid w/Powerglide
BM - 230cid w/Powerglide, AC
BN - 230cid w/Powerglide, exhaust emissions control
BP - 230cid w/Powerglide, PCV, AC
G - 194cid w/manual trans
GB - 194cid w/manual trans, heavy duty clutch
GF - 194cid w/manual trans
GG - 194cid w/manual trans, heavy duty clutch
GH - 194cid (taxi)
GJ - 194cid w/manual trans
GK - 194cid (taxi)
GK - 194cid AC
GL - 194cid w/manual trans, heavy duty clutch, AC
GM - 194cid AC
GN - 194cid w/manual trans, heavy duty clutch, AC
K - 194cid w/Powerglide
KB - 194cid w/Powerglide
KC - 194cid w/Powerglide (taxi)
KD - 194cid w/Powerglide (taxi)
KH - 194cid w/Powerglide, AC
KJ - 194cid w/Powerglide, AC
LL - 230cid w/manual trans, AC
LM - 230cid w/manual trans
LN - 230cid w/manual trans, AC

Biscayne/Bel Air/Impala/Caprice
A - 230cid w/manual trans
AE - 230cid w/manual trans, heavy duty clutch
AF - 230cid w/manual trans, AC
AG - 230cid w/manual trans, AC, heavy duty clutch
B - 230cid w/Powerglide
BQ - 230cid w/Powerglide, AC

trucks
N - 230cid w/3-speed manual
ND - 230cid w/Powerglide
NE - 230cid w/4-speed HD
PG - 292cid w/manual trans
PK - 292cid w/Powerglide

1965
Chevy II/Nova
LP - 230cid w/manual trans
OK - 194cid w/manual trans
OM - 194cid w/manual trans, heavy duty clutch
ON - 194cid w/3-speed, heavy duty clutch
OQ - 194cid w/manual trans (taxi)
OR - 194cid w/Powerglide
OT - 194cid w/Powerglide (taxi)
PA - 230cid
PC - 230cid
PI - 230cid
PV - 230cid w/3-speed manual
PX - 230cid w/Powerglide

Chevelle/Malibu
AA - 194cid w/manual trans
AC - 194cid w/manual trans, heavy duty clutch
AG - 194cid AC
AH - 194cid w/manual trans, heavy duty clutch, AC
AK - 194cid (taxi)
AL - 194cid w/Powerglide
AN - 194cid w/Powerglide (taxi)
AR - 194cid w/Powerglide, AC
CA - 230cid w/manual trans
CB - 230cid w/manual trans
CC - 230cid w/Powerglide
CD - 230cid w/Powerglide, AC

Biscayne/Bel Air/Impala/Caprice
FA - 230cid w/manual trans
FE - 230cid w/manual trans, heavy duty clutch
FL - 230cid w/manual trans, AC
FF - 230cid w/manual trans, AC, heavy duty clutch
FM - 230cid w/Powerglide
FR - 230cid w/Powerglide, AC
FK - 230cid w/manual trans (taxi)
FP - 230cid w/Powerglide (taxi)

trucks
TA - 230cid w/3-speed manual
TE - 230cid w/Powerglide
TG - 230cid w/4-speed manual
UH - 292cid w/manual trans
UT - 292cid w/Powerglide

1966
ChevyII/Nova
OK - 194cid w/manual trans
OM - 194cid w/manual trans, heavy duty clutch
ON - 194cid w/3-speed, heavy duty clutch
OQ - 194cid
OR - 194cid w/Powerglide
OS - 194cid w/Powerglide, PCV (taxi)
OT - 194cid
PC - 230cid exhaust emissions control
PG - 230cid w/Powerglide, exhaust emission controls
PI - 230cid w/Powerglide, exhaust emission controls
PV - 230cid w/manual trans
PX - 230cid w/Powerglide
ZV - 194cid
ZW - 194cid
ZX - 194cid w/Powerglide, exhaust emissions control
ZY - 194cid exhaust emissions control

Chevelle/Malibu
AA - 194cid w/manual trans
AC - 194cid w/manual trans, heavy duty clutch
AG - 194cid AC
AH - 194cid w/manual trans, heavy duty clutch, AC
AK - 194cid w/manual trans
AL - 194cid w/Powerglide
AN - 194cid w/Powerglide
AR - 194cid w/Powerglide, AC
AS - 194cid exhaust emissions control
AT - 194cid exhaust emissions control, AC
AU - 194cid w/manual trans, exhaust emissions control
AV - 194cid w/manual trans
AW - 194cid w/manual trans, exhaust emissions control
AX - 194cid w/Powerglide, exhaust emissions control
AY - 194cid w/Powerglide, exhaust emissions control, AC
AZ - 194cid w/Powerglide
BL - 230cid w/Powerglide, exhaust emissions control
BM - 230cid w/Powerglide, exhaust emissions control, AC
BN - 230cid exhaust emissions control
BO - 230cid exhaust emissions control, AC
CA - 230cid w/manual trans
CB - 230cid w/manual trans
CC - 230cid w/Powerglide
CD - 230cid w/Powerglide, AC

Biscayne/Bel Air/Impala/Caprice
FA - 250cid w/manual trans
FE - 250cid w/manual trans, heavy duty clutch
FF - 250cid w/manual trans, heavy duty clutch, AC
FK - 250cid w/manual trans (taxi)(police)
FL - 250cid w/manual trans, AC
FM - 230cid w/Powerglide
FP - 250cid w/Powerglide (taxi)(police)
FR - 250cid w/Powerglide, AC
FV - 250cid AC
FY - 250cid exhaust emisssions control
FZ - 250cid exhaust emissions control (taxi)
GP - 250cid w/Powerglide, exhaust emissions control
GQ - 250cid w/Powerglide, AC, exhaust emissions control
GR - 250cid w/Powerglide, exhaust emissions control (taxi)

Olds F-85
F - 250cid 1bbl

Firebird, Tempest - OHC
ZG - 230cid w/auto trans, 1bbl
ZK - 230cid w/manual trans, 1bbl
ZM - 230cid w/auto trans, 1bbl
ZN - 250cid w/auto trans, 1bbl
ZS - 230cid w/manual trans, 1bbl

trucks
TA - 250cid w/manual trans
TE - 250cid w/Powerglide
TF - 250cid w/4-speed HD trans
SV - 250cid emission controls
SW - 250cid w/Powerglide, emission controls
SX - 250cid w/4-speed HD trans
UH - 292cid w/manual trans
UT - 292cid w/Powerglide
VQ - 292cid w/manual trans, emission controls
VR - 292cid w/Powerglide

1967
ChevyII/Nova
OK - 194cid w/3-speed manual
OM - 194cid w/manual trans, heavy duty clutch
OR - 194cid w/Powerglide
PC - 250cid w/manual trans or OD
PI - 250cid w/Powerglide, exhaust emission controls
PL - 250cid w/Powerglide, exhaust emission controls
PV - 230cid w/manual trans
PV - 250cid w/manual trans or OD
PX - 250cid w/Powerglide, exhaust emission controls
ZX - 194cid w/Powerglide, exhaust emission controls
ZY - 194cid exhaust emissions control

Camaro
FB - 250cid (COPO 9627)
FM - 250cid w/Powerglide
FR - 250cid w/Powerglide, AC
GP - 250cid w/Powerglide, exhaust emission controls
GQ - 250cid w/Powerglide, AC, exhaust emission controls
LA - 230cid w/manual trans
LB - 230cid w/manual trans, AC
LC - 250cid w/manual trans, exhaust emission controls
LD - 230cid w/manual trans, AC, exhaust emission controls
LE - 230cid w/Powerglide
LF - 230cid w/Powerglide, AC
LG - 230cid w/Powerglide, AC
LH - 230cid w/Powerglide, AC, exhaust emission controls
LI - 230cid w/manual trans
LK - 230cid
LN - 250cid w/manual trans
LO - 250cid w/manual trans, AC
LP - 250cid w/manual trans, exhaust emission controls
LQ - 250cid w/manual trans, AC, exhaust emission controls
LR - 250cid w/Powerglide
LS - 250cid w/Powerglide
LT - 250cid w/Powerglide
LU - 250cid w/Powerglide

Chevelle/Malibu
BB - 230cid w/manual trans, heavy duty clutch, AC
BC - 230cid w/manual trans, heavy duty clutch
BL - 230cid w/Powerglide, exhaust emissions control
BM - 230cid w/Powerglide, exhaust emissions control
BN - 230cid w/manual trans, exhaust emissions control
BO - 230cid w/manual trans, exhaust emissions control
CA - 230cid w/manual trans
CB - 230cid w/manual trans, AC
CC - 230cid w/Powerglide
CD - 230cid w/Powerglide, AC
CM - 250cid w/manual trans or OD
CN - 250cid w/manual trans, AC
CO - 250cid w/manual trans or OD, exhaust emissions control
CP - 250cid w/manual trans, AC, exhaust emissions control
CQ - 250cid w/Powerglide
CR - 250cid w/Powerglide, AC
CS - 250cid w/Powerglide, exhaust emission controls
CT - 250cid w/Powerglide, exhaust emission controls, AC

Biscayne/Bel Air/Impala/Caprice
FA - 250cid w/manual trans
FE - 250cid w/manual trans, heavy duty clutch
FF - 250cid w/manual trans, heavy duty clutch, AC
FL - 250cid w/manual trans, AC
FM - 250cid w/Powerglide
FR - 250cid w/Powerglide, AC
GP - 250cid w/Powerglide, exhaust emission controls
GQ - 250cid w/Powerglide, AC, exhaust emission controls

Olds F-85
F - 250cid 1bbl

Firebird, Tempest - OHC
ZG - 230cid w/auto trans, 1bbl
ZK - 230cid w/manual trans, 1bbl
ZL - 230cid w/auto trans, 4bbl, exhaust emission controls
ZM - 230cid w/auto trans, 1bbl
ZN - 250cid w/auto trans, 1bbl
ZS - 230cid w/manual trans, 1bbl

trucks
SV - 250cid w/manual trans, emission controls
SW - 250cid w/auto trans, emission controls
SX - 250cid w/4-speed HD trans
TA - 250cid w/manual trans
TC - 250cid w/manual trans
TD - 250cid w/4-speed trans
TE - 250cid w/auto trans
TF - 250cid w/4-speed trans
TS - 250cid w/TH350, emission controls
UH - 292cid w/manual trans
UR - 292cid w/manual trans
UQ - 292cid w/TH350
UT - 292cid w/Powerglide
VQ - 292cid w/manual trans, emission controls
VR - 292cid w/Powerglide

1968
ChevyII/Nova
BA - 230cid w/3-speed manual
BB - 230cid w/manual trans, heavy duty clutch, AC
BC - 230cid w/manual trans, heavy duty clutch
BD - 230cid w/3-speed manual, AC
BF - 230cid w/Powerglide
BH - 230cid w/Powerglide, AC
CB - 250cid w/manual trans or OD
CM - 250cid w/3-speed manual
CN - 250cid w/3-speed manual, AC
CQ - 250cid w/Powerglide, exhaust emission controls
CR - 250cid w/Powerglide, AC

Camaro
BA - 230cid w/3-speed manual
BB - 230cid w/3-speed manual, AC, heavy duty clutch
BC - 230cid air conditioning
BD - 230cid w/3-speed manual, AC
BE - 230cid w/3-speed manual (export)
BF - 230cid w/Powerglide
BH - 230cid w/Powerglide, AC
BL - 230cid (COPO 9801)
BR - 230cid w/Powerglide (export)
CM - 250cid w/3-speed manual
CN - 250cid AC
CQ - 250cid w/Powerglide
CR - 250cid w/Powerglide, AC

Chevelle/Malibu
BA - 230cid w/manual trans
BB - 230cid w/manual trans, heavy duty clutch, AC
BC - 230cid w/manual trans, heavy duty clutch
BD - 230cid w/manual trans
BF - 230cid w/Powerglide
DF - 230cid w/Powerglide
GH - 230cid w/Powerglide
BH - 230cid w/Powerglide, AC
CM - 250cid w/manual trans or OD
CN - 250cid w/manual trans, AC
CQ - 250cid w/Powerglide
CR - 250cid w/Powerglide, AC

Biscayne/Bel Air/Impala/Caprice
CA - 250cid w/manual trans
CJ - 250cid w/manual trans, heavy duty clutch
CK - 250cid w/manual trans, heavy duty clutch, AC
CN - 250cid w/manual trans, AC
CQ - 250cid w/Powerglide
CQ - 250cid w/Powerglide, exhaust emission controls
CR - 250cid w/Powerglide, AC
CR - 250cid w/Powerglide, AC, exhaust emission controls

Olds F-85
VA - 250cid 1bbl
VB - 250cid 1bbl
VE - 250cid 1bbl
VF - 250cid 1bbl

Firebird - OHC
ZK - 250cid w/manual trans
ZN - 250cid w/auto trans
ZD - 250cid w/manual trans, Sprint option
ZE - 250cid w/auto trans, Sprint option

Tempest - OHC
ZK - 250cid w/manual trans
ZN - 250cid w/auto trans
ZO - 250cid w/manual trans, Sprint option
ZE - 250cid w/auto trans, Sprint option

trucks
PC - 250cid w/manual trans
PF - 250cid w/4-speed HD trans
PV - 250cid w/manual trans
PW - 250cid w/3-speed trans
PX - 250cid w/4-speed trans
TA - 250cid w/manual trans
TC - 250cid w/manual trans
TD - 250cid w/manual trans
TE - 250cid w/auto trans
TF - 250cid w/4-speed trans
TL - 250cid w/manual trans
TT - 250cid w/Powerglide
U3 - 292cid w/manual trans
UH - 292cid w/manual trans
UM - 292cid w/manual trans
UN - 292cid w/manual trans
UO - 292cid w/Powerglide
UP - 292cid w/3-speed trans
UQ - 292cid w/3-speed trans
UR - 292cid w/manual trans

1969
ChevyII/Nova
AM - 230cid w/manual trans
AN - 230cid w/torque drive
AN - 230cid w/Powerglide, exhaust emission controls
AO - 230cid w/TH350
AP - 230cid w/AC
AQ - 230cid w/Powerglide, AC
AR - 230cid w/TH350, AC
BB - 250cid w/Powerglide, exhaust emission controls
BB - 250cid w/torque drive
BC - 250cid w/Powerglide, AC
BC - 250cid w/torque drive
BD - 250cid w/TH350
BE - 250cid w/manual trans or OD
BF - 250cid w/AC
BG - 250cid w/TH350, AC
BH - 250cid w/TH350, AC

Camaro
AM - 230cid w/manual trans
AN - 230cid w/Powerglide
AO - 230cid w/TH350
AP - 230cid AC
AQ - 230cid w/Powerglide, AC
AR - 230cid w/TH350, AC
BB - 250cid w/Powerglide
BC - 250cid w/Powerglide, AC
BD - 250cid w/TH350
BE - 250cid w/manual trans
BF - 250cid AC
BH - 250cid w/TH350, AC

Chevelle/Malibu
AD - 230cid w/TH350
AM - 230cid w/manual trans
AN - 230cid w/Powerglide, exhaust emisssion controls
AO - 230cid w/TH350
AP - 230cid w/manual trans, AC
AQ - 230cid w/Powerglide, AC
AR - 230cid w/TH350, AC
BB - 230cid w/manual trans, heavy duty clutch, AC
BB - 250cid w/Powerglide
BC - 230cid w/manual trans, heavy duty clutch
BC - 250cid w/Powerglide, AC
BD - 250cid w/TH350
BE - 250cid w/manual trans or OD
BF - 230cid w/Powerglide
BF - 250cid w/manual trans, AC
BH - 250cid w/TH350, AC

Biscayne/Bel Air/Impala/Caprice
BA - 250cid w/manual trans
BG - 250cid w/manual trans, AC
BJ - 250cid w/Powerglide (taxi)(police)
BL - 250cid w/Powerglide (taxi)(police)
BO - 250cid w/Powerglide, AC
BO - 250cid w/Powerglide, AC, exhaust emission controls
BP - 250cid w/manual trans (taxi)(police)
BQ - 250cid AC

Olds F-85
VA - 250cid 1bbl
VB - 250cid 1bbl
VE - 250cid 1bbl
VF - 250cid 1bbl

Firebird - OHC
ZC - 250cid w/manual trans
ZF - 250cid w/auto trans
ZH - 250cid w/manual trans, 230hp Sprint option
ZL - 250cid w/auto trans, 215hp Sprint option

Tempest - OHC
ZC - 250cid w/manual trans
ZF - 250cid w/auto trans
ZH - 250cid w/manual trans, 230hp Sprint option
ZL - 250cid w/auto trans, 215hp Sprint option

Blazer/Jimmy
PC - 250cid
PD - 250cid
PE - 250cid

trucks
PA - 250cid w/3-speed manual
PB - 250cid w/manual trans
PC - 250cid w/manual trans
PD - 250cid w/TH350
PE - 250cid w/manual trans
PF - 250cid w/3-speed manual
PG - 250cid w/3-speed manual
PH - 250cid w/TH350
PI - 250cid w/manual trans
PJ - 250cid w/manual trans
PK - 250cid w/manual trans
PL - 250cid w/4-speed manual
PN - 250cid w/manual trans
PP - 250cid w/manual trans, emission controls
PQ - 250cid w/manual trans, emission controls
PW - 250cid w/auto trans
PX - 250cid w/auto trans
PY - 250cid w/Powerglide
PZ - 250cid w/4-speed manual
QA - 250cid w/manual trans
RA - 292cid w/Powerglide
RB - 292cid w/TH350
RC - 292cid w/Powerglide
RD - 292cid w/TH350
RE - 292cid w/manual trans
RG - 292cid w/manual trans
RH - 292cid w/manual trans, emission controls
RI - 292cid w/manual trans
RJ - 292cid w/manual trans
RM - 292cid w/Powerglide, emission controls
RN - 292cid w/TH350, emission controls
RV - 292cid w/manual trans, emission controls
SJ - 292cid w/manual trans

[1Bad62Pro/Street]

Chevy Six Cylinder Casting Numbers
http://67-72chevytrucks.com/vboard/s...d.php?t=356268

Stovebolt Casting Numbers

Try the Casting Number Lookup Tool!
http://www.adchevy.com/tools/castinglookup/

Casting # Make Year Displacement
1970 Chevrolet 64 - 67 292
2135412 GMC 46 - 54 248, 270
2192402 GMC (Military) 302
2193980 GMC 52 - 54 302
2324002 GMC 55 248
2324003 GMC 55 - 63 270
2324004 GMC 55 - 62 302
2404929 GMC 55 - 63 270
289890 Chevrolet 63 - 77 292
328518 Chevrolet 73 - 77 292
328572 Chevrolet 73 - 76 250
328575 Chevrolet / Buick / Oldsmobile / Pontiac 68 - 84 250
328576 Chevrolet / Buick / Pontiac 68 - 76 250
328578 Chevrolet 73 - 84 292
328880 Chevrolet 63 - 77 292
329990 Chevrolet 63 - 77 292
352194 Chevrolet 73 - 84 292
358825 Chevrolet 66 - 76 250
3629703 Chevrolet 50 - 52 235
364909 Chevrolet / Oldsmobile 75 - 79 292
3660439 Chevrolet 41 235
366855 Chevrolet / Buick / Oldsmobile / Pontiac 66 - 84 250
3692703 Chevrolet 50 - 52 235
3692708 Chevrolet 50 - 52 235
3692713 Chevrolet 50 - 52 235
3693374 Chevrolet 42 - 49 235
37001481 Chevrolet 53 - 55 235
3701946 Chevrolet 53 235
3703414 Chevrolet 54 - 56 261
37127 Chevrolet 73 - 76 250
3733340 Chevrolet 55 - 57 261
3733813 Chevrolet 58 261
3733946 Chevrolet 54 - 55 235
3733949 Chevrolet 53 - 55 235
3733950 Chevrolet 54 - 55 261
3737012 Chevrolet 55 - 57 261
3738307 Chevrolet 58 - 62 235
3738365 Chevrolet 60 - 62 261
3738476 Chevrolet 58 - 62 235
3738813 Chevrolet 55 - 63 261
3739365 Chevrolet 58 - 62 261
3739716 Chevrolet 58 - 62 235
3759365 Chevrolet 59 261
3764476 Chevrolet 58 - 62 235
3769716 Chevrolet 58 - 62 235
3769717 Chevrolet 59 - 62 261
3769925 Chevrolet 58 - 62 261
377127 Chevrolet / Oldsmobile / Pontiac 73 - 79 250
377129 Chevrolet 73 - 84 292
3773949 Chevrolet 54 235
3777178 Buick 68 - 76 250
3782856 Chevrolet 62 - 67 194
3782858 Chevrolet 62 - 67 194
378307 Chevrolet 60 - 62 235
3783949 Chevrolet 53 - 54 235
3788378 Chevrolet 62 - 74 292
3788406 Chevrolet 62 - 69 230
3788514 Chevrolet 62 - 70 153
3788813 Chevrolet 55 - 59 261
3789404 Chevrolet 63 - 76 292
3789412 Chevrolet 63 - 66 292
3789716 Chevrolet 63 - 72 292
3792852 GMC 62 - 66 194
3792858 Chevrolet 62 - 67 194
3821970 GMC 67 - 72 292
3833057 Chevrolet 62 - 70 194
3833067 Chevrolet 63 - 70 194
3833340 Chevrolet 55 - 57 261
383340 Chevrolet 55 - 57 261
3835253 Chevrolet 42 - 53 216
3835309 Chevrolet 42 - 49 235
3835335 Chevrolet 42 - 49 235
3835353 Chevrolet 48 - 52 216
3835363 Chevrolet 54 235
3835374 Chevrolet 42 - 49 235
3835491 Chevrolet 54 235
3835497 Chevrolet 42 - 53 216
3835527 Chevrolet 51 216
3835692 Chevrolet 50 - 52 235
3835794 Chevrolet 42 - 53 216
3835846 Chevrolet 53 235
3835849 Chevrolet 42 - 53 216
3835894 Chevrolet 53 216
3835911 Chevrolet 53 - 55 235
3835917 Chevrolet 54 - 55 235
3835946 Chevrolet 53 235
3835949 Chevrolet 54 235
3836012 Chevrolet 55 - 57 261
3836223 Chevrolet 55 - 57 235
3836233 Chevrolet 55 - 57 235
3836340 Chevrolet 55 - 57 261
3836386 Chevrolet 55 - 57 235
3837004 Chevrolet 55 - 57 235
3837012 Chevrolet 55 - 57 261
3843363 Chevrolet 53 - 55 235
3850817 Chevrolet 62 - 78 230, 250
3851656 Chevrolet 63 - 72 292
3851659 Chevrolet 63 - 76 292
3851859 Chevrolet 63 - 72 292
3854036 Chevrolet / Oldsmobile / Pontiac 62 - 76 230, 250
3855914 Chevrolet 63 - 66 292
3855987 Chevrolet 63 - 71 292
3855991 Chevrolet 63 - 70 230
3856233 Chevrolet 55 235
3858190 Chevrolet 54 - 55 235
386855 Chevrolet 74 - 77 250
3877178 Chevrolet / Buick / Oldsmobile / Pontiac / GMC 62 - 78 230, 250
3879875 Chevrolet 62 - 70 194
3886061 Chevrolet 63 - 66 292
3890011 Chevrolet / Buick / Oldsmobile / Pontiac 68 - 72 250
3890013 Chevrolet 68 - 72 250
3892858 Chevrolet 64 - 67 194
389770 Chevrolet 42 - 51 216
3897702 Chevrolet 42 - 53 216
3921770 Chevrolet 66 - 76 292
3921967 Chevrolet 64 - 69 230
3921968 Chevrolet / Oldsmobile 64 - 76 230, 250
3921970 Chevrolet 63 - 76 292
4001133 Chevrolet 76 - 80 292
6107326 GMC 39 - 52 228
6107328 GMC 53 - 54 248
828575 Chevrolet 72 - 77 250
8335794 Chevrolet 42 - 53 216
837751 Chevrolet 42 - 49 235
838101 Chevrolet 37 216
838710 Chevrolet 37 - 38 216
838941 Chevrolet 39 216
839132 Chevrolet 40 216
839400 Chevrolet 41 216
839751 Chevrolet 42 - 46 235
839770 Chevrolet 42 - 51 216
8397715 Chevrolet 42 - 49 235
839910 Chevrolet 42 - 51 216
839931 Chevrolet 42 - 49 235
8994256 Chevrolet 64 - 77 292
93403466 Chevrolet 75 - 83 250
93403467 Chevrolet 75 - 84 292
93406004 Chevrolet 75 - 84 292
9787437 Pontiac 66 - 67 230
9790043 Pontiac 68 - 69 250
9795066 Pontiac 68 - 69 250
9890043 Pontiac 68 - 69 50

[raycow]

OK, here's a cheap and dirty way to settle the 230/250 question.

Pull the plug on #1 and turn the crank by hand until the timing mark is on 0. Drop a pencil in the plug hole and mark it at the edge of the hole. Turn the crank exactly one half turn and mark the pencil again. The distance between the two marks is the stroke - not exactly, because of the angle, but it should be close enough.

Not to state the obvious, but make sure to use a pencil that's long enough so it doesn't get lost in the cylinder.

Ray

[M5-]

Well I haven't had time to do the pencil test but I did pull the seat out of the truck and got a better look at the build sheet. If I'm reading it right the seat must be from a different truck as it states the color of the truck as turquoise where it's obviously yellow. That explains quite a bit. Unfortunately the serial number on the build sheet is ruined so I can't read it all but what I can see doesn't really match any of the numbers in my vin.

All this is leading me to think that the engine in there is in fact the original motor and is a 250 even though the truck is titled as a 65. The engine was cast in either mid April 65 or 75 and the head is a 230 65 version. I have 04 Duramax that is an LLY but they also made an LBZ in 04. Because my LLY is early production it still has the LBZ tranny. GM has been mixing and matching for years and they still do it.

Being that the truck probably wasn't assembled till May of 65 I'm leaning towards it being one of the first 250 trucks ever produced. My vin shows it as the 43000 and something off the line in Janesville in 65. It'd be really nice to find some early production numbers someplace.

M5

[DPowers]

If only they could talk....
Nice looking truck by the way as well.