compression calculation PLEASE
compression calculation PLEASE 408
4.030
4.00
-2cc pistons
gm mls head gaskets
317 heads 71-72
texas giant cam
i belive its like 11.5ish but i have no idea... just wondering if i would pick up some power with a smaller chamber and bigger valves...
car made 484/462 through an ls6 intake and ported 317's
great power but ya know we can always use more
4.030
4.00
-2cc pistons
gm mls head gaskets
317 heads 71-72
texas giant cam
i belive its like 11.5ish but i have no idea... just wondering if i would pick up some power with a smaller chamber and bigger valves...
car made 484/462 through an ls6 intake and ported 317's
great power but ya know we can always use more
Last edited by 98mysticZ; Dec 14, 2009 at 11:00 PM.
408
4.030
4.00
-2cc pistons
gm mls head gaskets
317 heads 71-72
texas giant cam
i belive its like 11.5ish but i have no idea... just wondering if i would pick up some power with a smaller chamber and bigger valves...
car made 484/462 through an ls6 intake and ported 317's
great power but ya know we can always use more
4.030
4.00
-2cc pistons
gm mls head gaskets
317 heads 71-72
texas giant cam
i belive its like 11.5ish but i have no idea... just wondering if i would pick up some power with a smaller chamber and bigger valves...
car made 484/462 through an ls6 intake and ported 317's
great power but ya know we can always use more
Do you know how far your pistons are in or out of the hole? With them out .005" and entering the chambers as 71cc, you're right about 11.1:1. That cam would love some more compression!
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
i dont know how far out of the hole they are they are off the shelf diamond pistons for the 408 just dont remember the part number....... and i figured it would love more compression... how much would i need to mill these to get them in a good range or should i just get a set of like stage 2.5 ls6 heads?
TECH Apprentice
Joined: Oct 2007
Posts: 301
Likes: 20
Use the compression ratio calculator at Ross Pistons' website, it's near the top of the page:
http://www.rosspistons.com/products/formulas.php#
It's the most accurate I've found and easy to use.
http://www.rosspistons.com/products/formulas.php#
It's the most accurate I've found and easy to use.
Do you remember if the block was decked or not? That could help us find out if the piston is out of the hole or not.
Check you piston to valve clearance before you shave your heads.
Check you piston to valve clearance before you shave your heads.
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Verdad Gallardo ok well i dont know if it was decked or not... atleast i dont belive i was charged for it... i had it buily by a local shop called E.T. automotive in garland texas.... i guess i will have to call and see if they still have the paper on my build
