It's only the bore diameter that prevents them from working on any engine smaller than 6.0 liters. The heads also require a different intake but otherwise fit on all LSx engines. You don't even need different headers so long as you start with a 1-3/4" primary tube design header.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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