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FWIW My Challenger has a 650DP on it, stock cam, manifolds, Performer RPM & I've got 64's in front.. But I opened the PVCR .002 so it runs about the same A/F ratio under power but it's leaner & cleaner in cruise mode.. Personally I left the 76's in the rear, when your in the throttle enough to bring in the secondaries you probably want fuel so why lean it out 6 jet sizes?
The secondaries came with 70s from the factory. Hell, I run 70s in the primaries of my 600 single feed, with a plate in the rear on my 318 with a warm cam, so I figure a big block would most likely prefer a bit more secondary jetting.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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