360 no power on acceleration

[furrystump]

I know you have been offered a ton of very good advice so far. Car guys are a suspicious group,trust but verify! Did you confirm the dampener mark is correct gor TDC. You don’t need a degree wheel. Buy or make a piston stop. Place a piece of tape over the tdc mark on the dampener about 3 inches long. Mark sure you can still see the mark. Install the piston stop and turn the engine over by hand until it stops. Make a mark on the tape. Turn it back the other way until it stops again. Make another mark on the tape. Halfway between the two marks is true TDC. A crude measurement but close enough to see if the dampener is way off.

 

[barog]

I used Lokar throttle and kickdown equipment on my 67 273/904 combo and it has performed flawlessly. I installed mine at the suggestion of my transmission builder.

Thanks for the confirmation.

 

[barog]

I know you have been offered a ton of very good advice so far. Car guys are a suspicious group,trust but verify! Did you confirm the dampener mark is correct gor TDC. You don’t need a degree wheel. Buy or make a piston stop. Place a piece of tape over the tdc mark on the dampener about 3 inches long. Mark sure you can still see the mark. Install the piston stop and turn the engine over by hand until it stops. Make a mark on the tape. Turn it back the other way until it stops again. Make another mark on the tape. Halfway between the two marks is true TDC. A crude measurement but close enough to see if the dampener is way off.

I will add this to my list of things to verify.
Thanks for including the details of how to do it.

 

[AJ/FormS]

Alright here are the compression readings, I cycled the engine 4 revolutions.
1- 130
2- 144
3-140
4-135
5-140
6-137
7-138
8-140

Does anybody not think these are highly unusual numbers for a 285/285/112 SUMMIT cam in an 8/1 360.
Mr Wallace says to get numbers that high would require an Scr of nearly 10/1 with a fast rate cam, never mind a Summit...... Those are about the right numbers for a stock cam.
Something isn't making sense........................................

 

[nm9stheham]

I agree with your numbers AJ. But what we don't know is if the replacement pistons were standard flat top types, .100-.110" in the hole, or if they were a higher compression flat top, like some KB's. Unless the OP can find more info on the pistons in his engine, we can't know the answer. This goes back to furrystump's note of 'trust but verify'; unless 100% solid info is know or directly measured on the cam timing, damper 0 mark, and items like the pistons, then we can't do much more to say 'For sure it is this'.

 

[340dartley]

Does anybody not think these are highly unusual numbers for a 285/285/112 SUMMIT cam in an 8/1 360.
Mr Wallace says to get numbers that high would require an Scr of nearly 10/1 with a fast rate cam, never mind a Summit...... Those are about the right numbers for a stock cam.
Something isn't making sense........................................

It has been my experience that many compression testers are inaccurate. I usually worry less about total pressure and pay more attention to how the cylinder numbers compare to each other.