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Long block or shortblock? You will want to figure out what heads so you order the correct whipple. Ls3 and Ls7 style heads take different blowers because of the different port shapes.
427 LSX with PRC 285CC LS7 heads
ECS Ysi Setup
Made 914rwhp on ~11psi.
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Nick
Corvette Z06 -1200ish rwhp
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