Yea the power was not 300HP or even close though.ĪPT was set at 2.5 turns out on the Q jets.īest MPG from my 350's will come from a Q jet iron intake manifold. Granny 4 speed in that one 22+ MPG in the city. Q jet and Curve kit like the above on an iron Q jet intake. Next up was the heavy 1/2 ton GM truck of around the same year and same power plant 76cc smog head 350" stock rebuilder cam. Smog heads do NOT ruin the MPG of the SBC it is the tune that ruins the MPG.Ģ Different vehicles tweaked on one was a mid 1980's Surburban 350" bone stock other than adding a recurve kit in the distributor all timing in by 2200 rpm and 38 total NO vacuum advance Q jet carb and Q jet iron intake 18 MPG that was a mix of city and highway.
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