I know they are older, yet years ago they were pretty good. But I cant find any data on these heads. I have the LT1 stage 3 heads, and I was curious if anyone had flow numbers and chamber volume.
Also, is there room for improvement on these heads if done by them by the CNC machine?

 

Hey Steve, what's up? I'm running them also, and my stock short block Y-body is trapping 119+ mph. So, they must flow pretty well.

Here's a chart with CNC Heads listed. Not 100% ure if they are our heads.

http://www.fierolt1.com/lt1_lt4_headflow.htm

 

I have the CNC Cylinder Heads (Pinellas, FL) LT4's, purchased in 1999. Intake flow is very good, approaching 300cfm @ 0.700", with their ported LT4 intake bolted on. The intake actually improved flow, unlike many other combinations my shop has flowed. But the exhaust side is very weak, because they appear to have hogged the ports out too much, leaving them pretty much "unfixable". When my shop, an I tried to contact Pete at CNC about the exhaust problem, he refused to talk to us or answer e-mails.

 

i don't think they are in business anymore from what i've heard,but i did hear they had a good product.

 

Thanks guys, I am pretty happy with them. I am sure lloyd could fix or at least work the exhaust down the road.
I am curious as to what the chamber size is. I hear anywhere from 56-58cc.
I may try to measure them in my shop here.
I am changing my FelPro 1074 (.039) to the Impala SS (.029) gasket and just want to make sure I dont go to far in to 11to1 compression. I am at 10.9 SCR right now.