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I've seen one in person (and was able to drive it, although it was somewhat detuned) and know of a few others. The only thing special on the heads are the valve springs. Otherwise they are stock 66 273 parts. There are probably several cams out there that can be used in place of the original (I believe there are specs in the TSB, which I have here).



thats what i heard about the 273 heads, so if I used the 318 heads with good VS and a cam simular to the D dart, intake,carb and headers the 318 should make approx 318 HP with nothing more then a cam swap and 4brrl intake and carb..



What you have to do is experiment with the heads and know someone with a flowbench. You can get a larger valve without the shrouding. you can do a lot of work with bowl blending, port matching and smoothing,. The key is to get the maximum velocity.

We have numbers that show the 920's flow as well or even better than the 302's with a little work. there's a couple of Stock Eliminator racers that run 273s that stop by now and then. As far as that cam, you'd be best off to run with a 4 speed. If not you'll need a fairly loose converter.