Quote:
Originally Posted by 71455Formula
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those won't work for the OP application
The common "rectangle port" heads are the ones found on LS3, L92 & L99 engines
Some people mistakenly refer to all of the rectangle port castings as "LS3" cylinder heads, that come with huge 2.165" intake valves (LS3 are hollow stem, L92, L99 are solid)
The heads that are in the RHS link are LS7 cylinder heads, for small bore 3.90" -up (LS1 5.7L-up), the 4.8L engine that the OP has is only 3.78" bore
While the LS7 heads are a rectangle port, they are a different size rectangle port as compared to "LS3" cylinder heads (see pic)
You would need to run a LS7 intake manifold with the RHS cyl. heads
hope this clears up any confusion
Jeff