Join Date: Aug 1998
Location: Waldorf Md. USA
Depending on the piston, the "450" heads will give you a lot higher compression ratio, possibly too high for pump gas. You said that they had 2.02 / 1.50 valves ?? I am not even sure it is possible to put 2.02 valves in those heads. I will have to look at one on Monday, but I did not think there was enough room to do it without really hacking into the side of the chamber.
That being said, depending on your total combination and what you are trying to accomplish .... we tried them on a circle track 355 a few years ago. They made gangbuster torque coming out of the turns, but ran out of steam about half way down the straight, probably around 4800 rpm or so if I remember correctly. That was with the stock size 305 valves. We tried them because the class was limited to a flat top, 4 valve relief piston and with the 305 heads we could get 11 to 1 compression.
So if you are looking for a low rpm stump puller thay would probably be ok. But if you plan on spinning the engine up in the rpm's, forget it.
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner
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