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Can anyone find the flow numbers for the cylinder heads that are used on the ZZ4? According to Sallee Chevrolet, if you put a if you take the 355 HP ZZ4, and put in an LT-4 Hotcam w/1.6 rockers, you upgrade the output to 395 horsepower and 425 pounds of torque. So i am wondering what would be the difference if i used Edelbrock Performer cylinder heads. Edelbrock has the flow numbers for their heads on their website, but i can't find the flow numbers anywhere for the heads used on the ZZ4?
http://www.chevyhiperformance.com/te...98/index4.html
IIRC they're the L98 heads, shown in the link article.
You can get a GMPP porting option on those, which is supposedly pretty good.
I have a link somewhere for that data, but I'll have to dig around to locate it. Maybe someone else has it more readily at hand.
Flowing only 199cfm at 0.600 lift, it would be almost impossible to get 395hp out of ZZ4 heads and .525: lift - you would have to run right at the maximum to do it......
The ZZ4 with its base cam makes 355 HP, according to Sallee Chevrolet, installing the larger LT-4 HotCam adds 40 HP, so i am guessing if i had the Edelbrock heads on with the LT-4 Hotcam, i should see just over 400 HP?
