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Ok, Edelbrock Performer RPM aluminum heads. Talked to Vic Edelbrock Jr. and told me that all of their Performer RPM series will shift at 6500 all day. I shift mine at 6 grand with zero valve float. It's all about the total combination. Cheers

I went with Eddelbrock Performer RPM aluminum heads from 452's. WOW!! Big difference. 484 cam, Performer intake, 750 DP Holley double roller chain. Cheers