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: Holley 800cfm stock jetting? JC70SS Oct 2nd, 04, 5:28 PM Does anyone know what it is?? Also is the stock jetting ok to run on a 454 with 781's? By the way it is the holley 800cfm with manual choke and mech secondaries (8740)? -Joe Rmchevelle Oct 2nd, 04, 6:57 PM The Holley website gives stock jetting for all their carbs. It's in pdf format. JIM Oct 4th, 04, 5:25 AM Are you sure about that list# (8740)?? Could it be 4780? If so, stock jetting was 72/76 with 6.5 PV primary and 8.5 PV secondary. A 4780-1 = 70/76 6.5/6.5 A 4780-2 = 70/85 6.5 pri/ no sec PV JR m71 Oct 4th, 04, 6:28 AM my 800dp had 71/85's in it factory. no rear power valve. JC70SS Oct 5th, 04, 3:46 PM Yep I meant 4780. I think it is 4780-7 to be exact. | ||