question about cometic head gaskets and compression?
#1
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I am looking into getting some .040 cometic head gaskets but i noticed they said they are for a 3.910 bore but they will still work fine for a stock bore ls1 right? Also what kind of scr and dcr would i have with these and a set of tea 5.3 heads that have been milled .015? I have tried the search but i cant find the cr calculator. thanks for your help guys.
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Yes, they're perfect for stock bore. You can go bigger on gasket hole than bore size, just not smaller.
SCR for a ~60cc chamber on a LS1 would be in the 11.4/11.5 ballpark, assuming no piston notching.
My TEA 5.3 heads were milled .020" to achieve 59cc and with .040" Cometics and some piston flycutting I'm at 11.5.
Can't comment on DCR without knowing what cam you're running.
SCR for a ~60cc chamber on a LS1 would be in the 11.4/11.5 ballpark, assuming no piston notching.
My TEA 5.3 heads were milled .020" to achieve 59cc and with .040" Cometics and some piston flycutting I'm at 11.5.
Can't comment on DCR without knowing what cam you're running.
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#4
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Originally Posted by Thimble
Yes, they're perfect for stock bore. You can go bigger on gasket hole than bore size, just not smaller.
SCR for a ~60cc chamber on a LS1 would be in the 11.4/11.5 ballpark, assuming no piston notching.
My TEA 5.3 heads were milled .020" to achieve 59cc and with .040" Cometics and some piston flycutting I'm at 11.5.
Can't comment on DCR without knowing what cam you're running.
![Cheers!!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cheers.gif)
SCR for a ~60cc chamber on a LS1 would be in the 11.4/11.5 ballpark, assuming no piston notching.
My TEA 5.3 heads were milled .020" to achieve 59cc and with .040" Cometics and some piston flycutting I'm at 11.5.
Can't comment on DCR without knowing what cam you're running.
![Cheers!!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cheers.gif)
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Originally Posted by quiet_storm98
o ok thanks i will be running a 231/233 .612/.598 111+2 cam..i figure that i will have to flycut so im guessing my cr will be a lil lower then yours
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Originally Posted by quiet_storm98
I have tried the search but i cant find the cr calculator. thanks for your help guys.
Compression Calculator
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Originally Posted by brad8266
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#9
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Originally Posted by brad8266
That DCR is close to where tuning becomes very important to prevent knock retard. As long as you can tune it good you will be ok like that.