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The factory jetting is surprisingly close. I think factory center is 62 or 63. I've run them on stock ish 383 to roller cam 512's, with either track or dyno tuning. The highest center jet I've used are 65s.



can't recall what I pulled out of them I think they were 64-66's? I had 68's in it for the last cam/cpmbo (548/540 solid) Ran killer and not "gasey" at all. Outboards were stock w/ stock vaccuum springs. It did have a slight stumble if you goose it from 3k but from a dead stop it was lights out, especially when the Meth was on. I jumped up to 70's becuase this combo has more cam, more compression and much better heads. But you are right...I've had several friends run 11's in heavy b-bodys w/ almost stock units.