I think I've read somewhere about different flexplates being required for different i.e. older transmissions behind these engines. No firsthand experience here though. LS1 Tech has a special section devoted to retrofit/putting LS engines in cars that never came with them. It's called Conversions/Hybrids I think. Bet you can find the answer to your issue there.
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'65 Tempest 467 3650# 11.30@120.31
Last edited by Scott65; 08-18-2021 at 06:29 AM.
Reason: Correction
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