determing engine block numbers

[72 K20]

OK ! Here are some more numbers !!

VO403TDS Flint April 03rd TD "S"? Are you sure??? Verified, TDS
35 sideways 3970018 C318 S


K1212CDD St. Catherines, Ontario December 12th CDD is a 72-85 car line code used on 267, 305 and 350
14010203 canada G





V0802TWA Flint August 2nd TWA is a 74 C60/6000 350 160hp 2bbl
5.0LG 14093627
5G1

The numbers on the left are from the pad behind the left head (1,3,5,7,) and vice versa
__________________
Thanks,
Tom

[bruceman1968]

Tom,
3970018 is prob. 3970010 which is the 350
14010203 is a 80-85, 305
14093627 with suffix code TWA is a 89, 305, 175hp, 700 trans, L-03, TBI, vin H, from a 10 or 20 C or K

[72 K20]

Thank you Bruceman !!

I bought the TBI 305 as a 350,, oh well. I'll stick it in something,, it's a good running motor.

The '80 350 will probably be the motor for my C20,,, I just don't think the 305 will do what I want it to do,,,, the truck has the 3:54? gears and I am planning on running a 700R4. I'm planning on it being a daily driver with the occaisional trailer towing. Maybe the 305 might work with a 268H cam,performer intake, Q-jet,big rams horns and dual exhaust.

Thank You all very much for the information !!!
Take care !! Tom

[bruceman1968]

Tom, I did notice that the date code for the TDS motor is C318 which is march 31 1978. When there is a discrepancy like that casting date trumps engine ID stamp, so call it a 1978, 350 and build away.

[slikside]

Subscribed.
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[72 K20]

Thank you Bruceman !!
I have to get my shop finished before I'll be doing much of anything ! LOL !!

I think I kind of hyjacked this thread and I apolagize to the original poster for that.

Tommys72,, did you get the answers you were looking for ?

[tommys72]

you didnt hijack it, no worries man. you needed questions answered too. and honestly, with the holiday i didnt even look into it any farther. now ive pulled the seat out to put in a new carpet, but im actually gonna look at the engine again now with that pic being put up....thats an awesome pic

[Longhorn 70]

May I please hijack for a while? I have one I need too. Bought a motor and just want a bit more info on it. Looks like a 350 that the bottom end may have been rebuilt. Just guessing as it has brass freeze plugs in it with factory paint color over them.

EDIT: After power washing and letting it dry, there is Orange under the Blue.......

It's another 3970010
It is an auto trans crank in it. Thanks guys for the help.

[bruceman1968]

1977, 350, 165hp, 4bbl

[doubleb's69]

Originally Posted by 72 K20

SSTim
Thank You for the results ! I'm pretty positive on the S in the TDS code and Bruceman1968 could be right,, the engine has a sticker on the valve cover from a local shop that has long been out of business suggesting that it is not original to the truck.

The K1212CDD is probably a 305,, it has an aluminum Q-jet intake and this seems right for one of the so called "high output 305 ". I will have to tear it down to see what it is. I know that the cam is flat on several lobes so it is ready for a rebuild whatever it is.

The TO527CLB is in my 72 C20,,the truck came with a 402 but I didn't think it was original to this truck. Either way,, it's a big block and will be coming out.

The K1212 CDD was pulled out of an 88 van and has TBI on it with the pan mounted dipstick.
This is the motor I wanted to build for the C20. I sure think that GM could have come up with a better code system.

Prime example The LS3,, 71 or 72 402,,,,, or the LS3 vortech. How about the LT-1 ?

If it warms up some I will try to get some casting numbers off of these small blocks to zero in on the year,, that will probably tell us what they are.

I thank you all for the information and discussion !! I will be looking forward to future postings in this thread !!!

Take care everyone !!!
Tom

LT1 would be CRT, CTB, CTR, CTU, or CTC. Right now there is one on Des Moines Craigslist dressed up like an LT1 short block for $250. There is also a guy in Altoona selling a LT1 780CFM Holley and a set of LT1 rods and pistons. I hate being broke. The 1970 LT1 is my favorite engine.
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[Longhorn 70]

Originally Posted by bruceman1968

1977, 350, 165hp, 4bbl

Thanks BruceMan. That's what I found too. That is what it origanally was. I found I'll have to tear it down to find out what it really is now.

Thanks again,

vince.