Post your cruising rpms @60mph

[eray92]

Post your set up,

383 small cam headers intake q-jet 3" exhaust
200-4r
3.08
29.4" tires 255/45/20

Getting roughly 16.5 mpg

Rpm@60= 1300 roughly
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[bilfman]

454 781 heads
Edelbrock 750 and Performer
Headers
Torque ground cam and roller rockers
4L80E
3.73
32" tires
1850@60

[jitteryguy]

don't have the tach hook'd up yet but it sound's like 12000 at 60 MPH, I need overdrive and a 3.73 gear bad !

[TwoFiftyShifter]

Stock 305 smokes and burns oil. 31 inch tires. SM465 creeper box with 3.08 gears. 2000 at 60
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[INSIDIOUS '86]

26.5 tires and 3:73 gears and th350. 3000rpm at 60mph 3500 at 70mph which is where I cruise at haha. I need a nice 200r4
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[slugish]

Originally Posted by INSIDIOUS '86

26.5 tires and 3:73 gears and th350. 3000rpm at 60mph 3500 at 70mph which is where I cruise at haha. I need a nice 200r4
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Yea, I had 373 gears & a 350 3 sppeed at one time , & youre right on at 3000 rpms at 60 mph . Too steep for me , put in a 3.08 ,didnt like the performance , ended up with A 342 (BOUT 2500-2600 RANGE AT 60) Still not great over 70 , but I got tired of throwjng money at ring & pinions , plus the labor of someone else doing the work. Oh well you live & learn . I did a lot of things to my truck before I GOT ON THIS FORUM . yOU ARE SMART IF YOU GET ADVICE ON THIS FORUM, LIKE A LOT OF YOU ARE DOING, BEFORE YOU MAKE YOUR MODIFICATIONS

[Mikec10]

28" tires 3.73 gears and a nv3500, roughly like 2200-2500 rpms around 70-75

[izzy_Britton]

Stock 305
Edelbrock 1406
700r4
No clue rear gears
235/75/15
1750 @ 60
1950-2000 @ 72
about 22 mpg

[eray92]

My 200-4r was free ha, I have an older friend and he can not stand o/d auto trannies. He is a hot rod guy and... MOPAR. Any way I'm thinking of swapping gears to raise my rpms. I think 1200-1400 is too few rpms for a first gen sbc.

Keep posting them up!
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[Keith Seymore]

Originally Posted by eray92

My 200-4r was free ha, I have an older friend and he can not stand o/d auto trannies. He is a hot rod guy and... MOPAR. Any way I'm thinking of swapping gears to raise my rpms. I think 1200-1400 is too few rpms for a first gen sbc.

Keep posting them up!
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Tell him about the MOPAR A833 manual overdrive trans that you could get in these trucks....

http://www.customclassictrucks.com/t..._transmission/

K

[eray92]

Originally Posted by Keith Seymore

Tell him about the MOPAR A833 manual overdrive trans that you could get in these trucks....

http://www.customclassictrucks.com/t..._transmission/

K

I didn't know that, I think he has a couple of these laying around. Right now he is building a t-bucket powered by a 283 with corvette intake with 2 4 barrels and a Saginaw 4 speed.

I have 2 sets if gears, 3.08 and 4.56. Everyone says no to 4.56 but my rpms will be at 2100 at 60 and furthest I drive the truck is like 45 miles and the speed limits are 55 around here.
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[Skunksmash]

At 65mph I'm only doing 1400 RPM so at 80:

87
TBI 5.7L
2.73's
700R4
.7 final drive gear
80mph@1800 RPM
17mpg Highway 14 city

I used to think something was wrong with my RPM gauge.

[Rubble]

Originally Posted by Keith Seymore

Tell him about the MOPAR A833 manual overdrive trans that you could get in these trucks....

http://www.customclassictrucks.com/t..._transmission/

K

I have the same tranny in my 82 K25, 6.2/833/208/3.73.. It's howling a bit in OD,but it still gets 20mpg on highway in 3rd at 60 mph. Not bad for a 6" lift on 35s . 22-2300 @ 60. I like this tranny better than the 465, lot shorter throws too..
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[TwoFiftyShifter]

Originally Posted by izzy_Britton

Stock 305
Edelbrock 1406
700r4
No clue rear gears
235/75/15
1750 @ 60
1950-2000 @ 72
about 22 mpg

3.42

[TwoFiftyShifter]

My father had an 87 short bed 2WD, 4 speed manual with OD. He loved it.

[Ski-me]

Just tested out this morning:

60 MPH
1,600 RPM's
350/700r4
4.10 gears
35" Tires

70 MPH
1,900 RPM's

[cleansquare]

60 mph
350 with vortec heads
4L80e
4.10

2000 rpm
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[Blackpony]

Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5...
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[eray92]

Originally Posted by Blackpony

Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5...
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No need to come in here and make us feel bad! Haha
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[Skunksmash]

Originally Posted by Blackpony

Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5...
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How much would you say that your conversion cost you, in the end? I'm trying to gather up data on what I should pay for my 5.3 swap next year.

[Blackpony]

Originally Posted by eray92

No need to come in here and make us feel bad! Haha
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Hehe

Originally Posted by Skunksmash

How much would you say that your conversion cost you, in the end? I'm trying to gather up data on what I should pay for my 5.3 swap next year.

Ehhh I probably have around 4k in it. My biggest expense though was I bought the parts little by little as I had the cash and found a deal. I completely rebuilt my engine, new pistons, rods, crank, cam, springs etc. it was a new engine when I installed it. Also I bought a fully built trans and new converter. If you go 5.3 take out and can get say an engine and trans with the accessories and wiring, you should easily come under 2k total. I was just picky and wanted the aluminum 5.7 rather then an iron block so they tend to me a bit more expensive.
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[Skunksmash]

Originally Posted by Blackpony

Hehe



Ehhh I probably have around 4k in it. My biggest expense though was I bought the parts little by little as I had the cash and found a deal. I completely rebuilt my engine, new pistons, rods, crank, cam, springs etc. it was a new engine when I installed it. Also I bought a fully built trans and new converter. If you go 5.3 take out and can get say an engine and trans with the accessories and wiring, you should easily come under 2k total. I was just picky and wanted the aluminum 5.7 rather then an iron block so they tend to me a bit more expensive.
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Yeah I could get an all aluminum 5.3, but the difference in weight is only 40lbs. Still might do it, don't know. Putting spark plugs in aluminum heads may not be stress that I want in my life. Unless they got smart and started making that part iron. Then again, maybe the iron blocks still have aluminum heads...

[Blackpony]

Originally Posted by Skunksmash

Yeah I could get an all aluminum 5.3, but the difference in weight is only 40lbs. Still might do it, don't know. Putting spark plugs in aluminum heads may not be stress that I want in my life. Unless they got smart and started making that part iron. Then again, maybe the iron blocks still have aluminum heads...

They actually make an all iron ls engine. cant remember the year but it is a 6.0 and usually they are in 2500 hd trucks. There should be no reason to change plugs but maybe every 2-3 years unless you drive a bunch. 50k on a set of plugs is normal life. There is 0 difference in putting plugs in an aluminum head over an iron head. Our shop car gets new plugs every 2-3 passes down the track. With 1300 hp you have to keep fresh plugs in so you dont burn up the engine. we are yet to have an issue. Also the aluminum block is around 65-70 lbs lighter then its iron counter part.

[79Betty]

79
350 quadrajet
All stock
4.10's
35x12.50's
10 city 13 highway @ 2500 rpm
Would get better if i'd keep my foot out of it lol
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[Keith Seymore]

Sorry to be joining so late, but I've been away on business and haven't been driving the truck.

Looks like about 1900 rpm; 4.3L V6, MY6 manual overdrive trans (.73 ratio), 3.73 rear axle, P235/75R15 tires.

K