LS2 uses the 243 heads the same as the LS6 but without the sodium filled exhaust valves. The 2002 LS1 also will have an LS6 intake which is about a $350 item on the used parts market. The LS1/LS6 both have a 78mm throttle body while the LS2 will have a 90mm TB. The mentioned parts are interchangeable, except the obvious facts that you cannot put a 78mm TB on a 90mm intake and vice-versa. The LS6 is the best flowing, power building intake made from the factory for a 5.7L engine, 15-20hp higher than a 2001 or earlier LS1. The LS6 intake can be distinguished by the flat floor on the botton surface of the intake. If its not flat, its not an LS6 intake.
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