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.

Edit:
https://www.thirdgen.org/techbb2/sho...hreadid=236508
https://www.thirdgen.org/techbb2/sho...hreadid=262473

 

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?