ls1 intake
#3
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Take a look at this thread http://www.performancetrucks.net/for...d.php?t=357424. Also, take a look at this thread http://www.performancetrucks.net/for...d.php?t=392089. With a 4.8 L, you are nowhere near the potential of the truck manifold, even with ported heads and a bigger cam. The truck manifold outperforms the LS1 manifold for an engine of that displacement. If you were doing a conversion putting the 4.8 into a car with a low hood line, that would be a different motovation and a different story.
Steve
Steve