SHovV

Tony, what do the I and E runners cc when you're done with the program you used on this Z for Amerkin?

Tony @ Mamo Motorsports

Good question.....if you have followed my career you would know I value efficiency as much as peak flow.....these heads have only a modest increase in cc's. I will pour a few runners on a head Im working on now and report back but my guess is 275 cc's or so on the intake....90-95 on the exhaust. The exhaust is opened up more percentage-wise than the intake but that's not by accident.....more so by design....it needs to be larger to help the Exh to Int relationship be closer to optimal.

I will be in touch in a few days with the numbers.....Im out of town right now....heading home this weekend

Cheers,
Tony

Whis9

How much was milled off the heads?

95vettski

Hi Tony,
What size bore did you attain those figures with?

Tony @ Mamo Motorsports

Large bore of course (4.125)....you have to flow the LS7 stuff on a large bore to get representative results for that typo of head. It was designed with a larger bore motor in mind obviously and needs the real estate to properly clear the valves.

Radiused entry on the intake and a 1.875 pipe that is shaped like the first 8-9" of a typical header (curved down and close to the head). Its not a short straight pipe coming off the head (I call those cheater pipes....LOL). It simulates real world applicable conditions in the way it directs the air.


Good question....not a whole lot....with a thinner gasket and a few cc's shaved off the heads we set the CR around 11.7 to 1 going from memory.....I know I'm close cause Dennis didn't want to push it any higher on 91 and didn't plan on E85 or splashing race gas.


-Tony