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I don't have the answer ... just a comment on what I ran into.
I'm running HEI with R46SZ plugs gapped at .45 - pretty hot plug but it runs better. I had the R45 plugs and it was kinda rough, we gapped them at .60 with no change, and the plugs were kinda damp... went to the hotter R46SZ plug and have not had any problems... now I also haven't checked mileage but I'll get around to that.
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Jason
Hawaiian-J
70 Longbed, 307, Edelbrock Carb 1404, Edelbrock Intake 2101, Dual Roller Timing chain and gears, 214/214 cam, Comp Roller Rockers, dual Flowmasters.
1999 Chevy Tahoe
2004 Mini Cooper S
71 BMW 2002 - Sold
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