[Jason Oldfield]

I've heard very good things about these heads, and considered putting them on my 383 cid small block. But, I was advised against it since that motor only has a stock cast iron 4-bolt block, which wasn't really made to take 750+ hp, which is easily attainable with those heads. The cost difference to put together a motor using those 18° heads vs. a set of standard 23° heads is minimal. So, if you have the block and other components that can take the extra power, I'd go with them.

Good luck, and let us know which direction you go...