ZL-1, what Hp do you think it will make

[EZ Nova]

First gen, you right, these are just big air pumps really. BUT how can a PORTED sq port, BBc with 13-1 comp, 715 lift cam, 2.25 valve and 475 inches make "about" what a 1969 L-88 make with headers and a cam swap? Yet max out a Holley Hp1000 carb by 6600 RPM? Yet the other motor, with far less work and parts, made well over 700Hp

here are some numbers for you:

.200 .300 .400 .500 .600 .700 .800
int. 157 242 284 328 347 359 366

Exh. 130 169 196 227 258 261 268

Yes these heads are BETTER than BB2 PLUS with CNC option!

Those are THRU "198" intake with no pipe on exh port on Superflow SF-600 bench with a 4.350 fixture. We're "trying" something far different with these heads then what is considered normal! I would never have put the $$$ into these heads if it wasn't for the shop going good for ALL labour on this engine, I wouldn't have done it.

[EZ Nova]

Well, finally got it to a better dyno and with some better data. But I think we're at THE LIMITS of the block? Were down a bit of power! But all in all, I'm pretty satisfied with the results