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Old January 11th, 2017, 02:53 AM
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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: Muncie 4spd to NP440 conversion 66 GMG 3/4 ton

Quote:
Originally Posted by Dazzoman View Post
I need something usable and reasonable on gas . Originally I had the 305E in this truck circa 1980 and it never missed a gas station altho it was a great running and fun to drive .
At least GMC offered the 292 and so I put that in , in 1987 .
Now that Holley has an new EFI Sniper it looks like with this tranny its gonna be a win win .The 292 is a nice motor and mine runs great but it will cost the same to fix the head gasket small oil leak , replace the header , switch to 4 bl carb , cam etc . than to pop in a 350 .Probly get better milage .
V6's and I6's are usable and can be reasonable on gas, just depends on how you tune them up and how you drive then. Always towing? Doesn't matter what engine you have...it's gonna hog gas. Unless you throw a cummins in there. lol
My 64 GMC with a 305E that has a 4 barrel, HEI, and dual exhaust gets 9.9 in the city and 13 on the highway. Not bad for being 4.11 geared and carrying a 4500 pound 3/4 ton truck around.
I know a guy who had a 292 with a quadrajet, headers, and HEI in a 66 chevy truck that got 20 MPG with a 5 speed.
Carbed 350 will get bad mileage as well, Gearing and Tire size makes for some of the biggest differences. All you'll get is some extra horses.

But you said that setup liked Torque and I was clarifying the 350 is far from a torque monster. lol It is a glorified engine, decent power, but sucks just as much fuel when towing and doesn't do much better either.

I drive my 64 7 days a week and that 305 never lets me down.
My 292 never did either, but I decided to restore the truck. And a way hotter 292 is in there now with a tko600. lol

I guess torque to me is a big cam cummins or a 572 chevy that puts out 800 torque or a 478 V6.
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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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