Have you pulled the cap since you replaced it, and looked at the rotor? I've seen the wrong rotor sold with the HEI cap. Make sure it looks like the old one. I remember fiddling with my rotor to get it on correctly, back when I was running the OEM 454.
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2004 AllegroBay 34XB Nov 2017 Banks, Front & Rear Trac bars, Konis
Sold:'83 Revcon Prince 31' FWD GM Performance 502 w/Edelbrock MPFI, Thorley Tri-Ys & Magnaflows, 4L85E 4 spd. Tested to exceed 100 mph.
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