One difference is the clutch diameter. It's not unusual to see an LT1 assembly code ground and restamped as a ZR1 by changing out the clutch. I looked at a 1972 ZR1 that was prepared this way, no ZR1 engines, grind and restamp the LT1 code and change the clutch.
Last edited by TimG; 09-05-2025 at 12:46 AM.
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