65 Barracuda daily driver

JDMopar said
I looked around and the only info I could find was that they are older Sealed Power pistons, which are the same a TRW. They are forged, but I couldn't find any specs as far as compression height. Depending on the CC's of your heads, my WAG on compression is maybe 8.5 - 9.0. After all the work you've done, if it runs good enough to put a smile on your face....it's got enough compression, lol.

:thumbsup:

I just like to have an idea of what I'm dealing with and I'm always curious to learn something new. It's a '69 block, so the stock pistons should have been not that far in the hole.

mosleyme said
Bring piston to top dead center, measure how far down in the hole. Then need to look up piston to get dish (or measure). Need compressed thickness and bore of gasket (published by gasket mfg). Need measured volume of combustion chamber. Then it is all math from there. Anything else is guessing.

You do not know if the block has been decked. You do not know if the heads have been milled.

My guess - flat tops with valve notches, block probably not decked, open chambers - 9:1-ish

The bores are 0.30 over, otherwise all stock and neither heads nor block have been decked. The 675 heads are supposed to be around 68cc from the factory. The gaskets are gonna be Fel-Pro 8553 PT, which are advertised as Manufactured Thickness .0468" - .0572". I couldn't find much on the pistons online, but supposedly they are equivalent to a TRW L2329F, which has a compression height of 1.759". Technically it should be very close to a stock '69 318 when done, so that would be around 9.2:1.