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Old November 20th, 2016, 02:43 AM
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TJ's GMC TJ's GMC is offline
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Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
Swapping out for the HEI and the carb won't improve your mileage by more than 1-2 mpg. You'll see 12-15mpg on average, which was pretty decent for the time.

The HEI and carb will make cold starts easier and will make the engine run smoother though, provided it's running not-so-smooth now. If that ain't broke, you can keep it as a rotor/points system and drive it like you stole it. These engines are very tough.
He'd be lucky to see 10 in a truck that size. The bigger carb and HEI swap with dual exhaust on my 305 was quite an improvement. More power over anything.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
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