Quote:
Originally Posted by zz430camaro
I would say with a cam that size 11.25 or 11.5 would be Ok. You can mill the heads 0.030 and run the stock gasket for about 11.29 compression. Or run a cometic .045 gasket to get a better quench area plus mill the heads .025 or 0.030. I think Bo White runs a larger TSP cam with their 13 degree heads and milled his 0.030 with no issues. You can put the heads on the motor with no head gaskets and mearsue piston to valve clearance and figure back from there how much you room you have to play with (measued PTV clearance - amount milled + head gasket = new PTV clearance. The beauty of E85 is you can run high compression so if you are serious about using it, get it up to like 11.5 if you can, shit with good E85 you can probably run 12.0.
every 0.006" you mill off the heads will get you 1cc less combusion chamber volume.
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Great info, thanks. 11.5 is the goal i was thinking of going for but was not sure if I could mill that much to get to 11.5. I wanted the heads milled with a valve job done before i have it pulled apart so the car isnt down too long. So measuring the PTV before would be tough. But if that ends up being the only way then i will do what is necessary
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2013 SS M6, TSP Stage 3 231/246 cam kit, TSP Trunion upgrade, Cold Air Inductions CAI, VMAX PTB, TSP 1 7/8 Long tube headers and high flow cats, Corsa Xtreme ZL1 Catback exhaust, Elite E2-X Catch can, Trick Flow Gen-X 255 heads milled 0.025 and valve job, GPI rod mod and ported intake, ID850 injectors,ZL1 fuel pump, Flex sensor and E-85, Mantic 9000 and 1LE 3.91 diff 512rwhp/462rwtq
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