The problem with putting later model heads from a 350 onto a 283 is that the much larger combustion chambers will kill the compression on a 283. It will drop to likely 7 or 7.5-1. This is one of the reasons that the HO305 heads are widely used when upgrading a 283. The HO305 heads have 1.84 intake valves as opposed the the 1.74 intake valves in the old Power Pak heads, plus they have aprox 58cc combustion chambers.
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Originally Posted by James903
Just curious about heads for a 283. I still have the original 283 in my truck and it has surprisingly really good compression. I've considered leaving it in and putting a different cam, intake, and carb. I've heard people using 305 heads and I was wondering if I could use a set of 1.94s I have off of a 350 on it? They have newer valve guides. I've heard old 283 heads don't handle the newer fuel that well. I don't know the casting # off hand. I also have a set of double hump 2.02 heads, but I figure they would be better on a 350. My guess is I could use them but the compression will be different??
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Originally Posted by James903
Maybe I will try the 1.94s with the bigger cam. I kinda like the idea of a couple extra mounting holes on the front in the newer heads. I'm actually more curious how much better the 283 will run with some of the mods (carb,intake,cam,and different heads)
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