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Jul 21st, 2025 | | | | Joined: Oct 2020 Posts: 2 Moderated | | Moderated Joined: Oct 2020 Posts: 2 | I'm pondering on rebuilding a 292 I have.
It will go in a ton Chevy square body.
Mated to a 4L80, in place of a diesel.
I have a good block.
Four barrel intake.
Will have dual cast iron headers.
This is torque build, not worried about gitty up and go ability.
Your input would be much appreciated.
I know the usual inline part sources.
Figuring on going .30 over, with high test pump gas compression pistons, and valve job and getting the crank turned.
I'd like a cam source, valve train input, piston sources, etc.
Vroom Vrooms and Boom Booms.
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | GM made propane Pistons, don't know present availability. Delta Cams in the Seattle area has hood recommendations.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Mar 2010 Posts: 1,659 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,659 |
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Jul 2013 Posts: 388 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 388 | 12bolt.com has a good variety of build parts including several different cams, some pistons, rods, valves, etc. I went through him for the majority of my build... he has a wealth of knowledge and would give you good info if you reached out to him.
As far as the propane pistons mentioned above, when I did my rebuild earlier this year, those were scarce and not currently produced so prices when found were quite high, almost to the point of what new aftermarket high compression pistons were. | | |
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