Peak RPM for best torque, fuel efficiency? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bud45 · 07-02-2008, 04:24 PM

I have a 1965 283 transplanted into my 1969 GMC longbed p/u, which still uses three-on-the-tree original transmission and (I think) 3.73 rear gears, with 265.60x15 tires, pumped to 36-38 psi, cold...and have peaked & tuned on it, but I haven't found one thing that interests me: at what RPM would the engine be the happiest for peak torque for best M.P.G?

I've googled for the specs on these engines and haven't found anything yet- ideas, please?

07-02-2008, 04:24 PM	#1
bud45 Registered User Join Date: Nov 2004 Location: Satsuma, AL Posts: 72	Peak RPM for best torque, fuel efficiency? I have a 1965 283 transplanted into my 1969 GMC longbed p/u, which still uses three-on-the-tree original transmission and (I think) 3.73 rear gears, with 265.60x15 tires, pumped to 36-38 psi, cold...and have peaked & tuned on it, but I haven't found one thing that interests me: at what RPM would the engine be the happiest for peak torque for best M.P.G? I've googled for the specs on these engines and haven't found anything yet- ideas, please?

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