Should I mill these heads?
Should I mill these heads? I have a set of ported 799s going onto my LS2 with a ASA cam. Should I mill these heads first? I do not want ptv clearance issues. Cam is .525/.525 226/236. Milling .025 will bring it down to right around 61cc, bringing the CR up to almost 11.5. What would you do?
I cc'd the chambers today and they are 67cc after the port work. At .006" = 1cc, shaving .030" will bring the chambers to 62cc, giving me 11.26 compression. Anyone see any piston-to-valve clearance issues with this?
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Something to thing about; if you went to the .040 Cometic gasket, you could mill less and still get the same added compression you desire. The other thing this will do is add quench which helps protect against detonation. Tight quench is a great thing for a NA motor. Oh, and as for your original question, I don't think you'll have PtV issues at all with that cam. Intake duration is typically the main thing to concern yourself with. Now, the only way to make sure is to measure.
No, what he's saying is that the back cutting of the valves, and port work increased the chamber size.
No, what he's saying is that the back cutting of the valves, and port work increased the chamber size.
i'm still new to all of the heads and such. so porting the innards of the heads also affect the cc overall, meaning for example 799 heads be 64cc and if i do a home-port job such as removing the lump and bulleting the intake valve area that the overall cc would go up some? sorry for the threadjack btw COSTIGAN86
ah ok. so it brought the cc from 64cc to 67cc and now that he milled the heads 0.020" they're now around 63.75cc-ish?
i'm still new to all of the heads and such. so porting the innards of the heads also affect the cc overall, meaning for example 799 heads be 64cc and if i do a home-port job such as removing the lump and bulleting the intake valve area that the overall cc would go up some? sorry for the threadjack btw COSTIGAN86
i'm still new to all of the heads and such. so porting the innards of the heads also affect the cc overall, meaning for example 799 heads be 64cc and if i do a home-port job such as removing the lump and bulleting the intake valve area that the overall cc would go up some? sorry for the threadjack btw COSTIGAN86
I am running the howards vs ASA cam with PRC 243/799 Stage 1 heads Milled .030 with .045 cometic gaskets on a LS1.
My PTV was .083 intake and .125 Exhaust
Just FYI, but I would always check.
My PTV was .083 intake and .125 Exhaust
Just FYI, but I would always check.