Do you have the pistons already ...?



You need the cc of the pistons .
The cc size of the chamber on the heads.
Your not building a max effort drag engine ,so advertized cc ratings for both of those will be close enuff for your application ,no need to get exactly precise.

Once you find those numbers ,you can make a close guess as to what the static compression of the engine will be.
I looked around online and did not see the cc of the chamber for the heads listed.You might want to do some searching for those numbers ,maybe even call GM if all else fails.


Pat knows alot about these engines ,he does this stuff everyday ,listen close to what he talks about!!!!


One other thing to take into account for static compression and that is the deck height of the block,usually a undecked block will have the pistond down in the bore some ,instead of whats called a 0 deck height ,this will chang the static compression numbers some.
Pat may be able to tell you the standard numbers of what these pistons are below the deck if your block has not been decked.

If the block was just decked to straighten it ,you may need to wait untill the pistons are installed to get this number.If the block has been 0 decked then use that figure to determine static compression.

If you look at the static compression calculator it will list all the specs you need to determine what you have,make a list of these and write them down,they come in handy during the build and for future reference.