Piston Question

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Piston Question

Post  Rich Osmond on March 6th 2013, 4:25 pm

All - Hopefully a straight forward question for the experts on here. I recently bought a 532 A-head engine only to discover the block had several cranks through the main cap bolts holes (bummer...). Anyway, I am building an entire new short block for the A-heads and would like to reuse the rotating assembly out of the cracked block in another block utilizing Eddy CJ heads.

Question - Is this as simple as checking piston to valve clearance and having a new relief (or reliefs) cut? The parts are nice and hate to see them go to waste if I can use them. Thanks for your help!!

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Re: Piston Question

Post  bbf-falcon on March 6th 2013, 4:54 pm

If the pistons are FLAT tops I cant see why not as long as the correct size reliefs are cut and checked before assembly.

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Re: Piston Question

Post  Rich Osmond on March 6th 2013, 4:56 pm

Yes, should have mentioned they are flat gas ported Diamond pistons with a single (intake) valve relief. Thanks!

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Re: Piston Question

Post  Lem Evans on March 6th 2013, 4:58 pm

What comp ratio are you looking for? Flats w/A460 heads may not have much.

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Re: Piston Question

Post  Rich Osmond on March 6th 2013, 5:04 pm

Nothing too high as I will run it on E85 and street drive it. I may have calculated it wrong but came up with ~ 12.6:1 estimating a second valve relief of ~3cc's, .005" down in the hole and a .040" gasket thickness. Lower would actually be better.

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Re: Piston Question

Post  bbf-falcon on March 6th 2013, 6:20 pm

Rich Osmond wrote:Nothing too high as I will run it on E85 and street drive it. I may have calculated it wrong but came up with ~ 12.6:1 estimating a second valve relief of ~3cc's, .005" down in the hole and a .040" gasket thickness. Lower would actually be better.

I would say you are fairly close.

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