i have the formula,s but my math sucks so i need help please. 2 possiable combos . 21cc dish piston 039 head gasket thickness with a 64cc combustion chamber and or with a 72cc combustion cahmber . dont know piston to deck clerance but a round about close figure will do. sbc 427 stroker . please give speculation for both head combo,s . thank you :confused:

Originally posted by motown/malibu:
i have the formula,s but my math sucks so i need help please. 2 possiable combos . 21cc dish piston 039 head gasket thickness with a 64cc combustion chamber and or with a 72cc combustion cahmber . dont know piston to deck clerance but a round about close figure will do. sbc 427 stroker . please give speculation for both head combo,s . thank you :confused: Just go here & download Pat's calculator, It is very precise.
Not only that there are a few things here you should be able to learn from ;)

When you get done you can thank Pat Kelley :D
Pat's Site (http://cochise.uia.net/pkelley2/index.html)

Or you can go here:
KB (http://kb-silvolite.com/calc.php)

Or here:
Ross (http://www.rosspistons.com/calculator.php)

Typing may be involved :rolleyes:

ok thanks i have some figures from those sites and i mainly wanted to check them with some one elses figures to see if i was correct or not .. so this topic is stil open . tahnk you

Originally posted by motown/malibu:
ok thanks i have some figures from those sites and i mainly wanted to check them with some one elses figures to see if i was correct or not .. so this topic is stil open . tahnk you If you are building a 427 SBC in my opinion "round about" really don't cut it :D
but here are some numbers for you.

Assuming an uncut deck & unbored block,, you are going to be about .025 down with most piston & rod combos.
If the deck is cut to 9.00 with most you will be at zero.
This is all assuming again you are using a standard deck block,,,I hate assumptions :(

Using the same 4.200x.039 gasket with these two scenarios the static compression will be 9.11 & 9.76 or 9.55 & 10.27

yes standard block 9.00 deck i came up with 9.10 and 10.20 so i guess i wasnt far off thanks mike