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If were talking just cost. The LT5 and LT4 probably have a closer price point than you think. Most of the parts are the same. The LT5 and LT4 use the same high pressure fuel pump and injectors. Same Low side pump.
The LT5 and LT4 use the same cylinder heads.
The LT5 and LT4 use the same pistons but with different rings and same rods I do believe.
The LT5 has an AFM-less valley plate.
The LT5 has different crank
The LT5 has a different camshaft.
The only major difference is the 2650 supercharger And secondary port fuel system with small injectors. Running off the same fuel pump that supplies fuel to the high-pressure pump.
Unlike the LS9 that thing is just holy crap expensive on everything.
So totally up to GM.
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