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Big Port Jimmy 6 · 01-19-2011, 11:27 PM

One other thing, The 302s are a big bore (4") long stroke (4" stroke 7" rod) heavy engine, Fuel economy is not one of the virtues of these engines. They were made for torque to move loads in 2 ton and up trucks. You will only find them in big trucks or busses from 52-59. The quick rule of thumb is that the truck should have 20" wheels to be big enough. The first three digits on the pad beside the distributor on a GMC six is the displacement. Jay

01-19-2011, 11:27 PM	#8
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Re: New To Forum: 72' GMC Jimmy with a 302 'Jimmy' GMC Inline 6? One other thing, The 302s are a big bore (4") long stroke (4" stroke 7" rod) heavy engine, Fuel economy is not one of the virtues of these engines. They were made for torque to move loads in 2 ton and up trucks. You will only find them in big trucks or busses from 52-59. The quick rule of thumb is that the truck should have 20" wheels to be big enough. The first three digits on the pad beside the distributor on a GMC six is the displacement. Jay __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.