Whats your 67-72 chevy 2wd or 4wd gettin on fuel millage? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sammy · 02-17-2011, 02:07 PM

My 71 GMC SB 96 350 Vortec (about 20 grand on the motor) with 600 Holley n 350 turbo 307 rear 15/16 max on the hwy at 60/65 or below. The 69 LB 350 (65 grand on the motor) w/4 spd top loader and 307 rear is about 2 MPG less depending on how hilly it is. When I had the stock 2 barrel carb on it I could manage 16/17, but not much difference. Any MPH above that results in a drastic reduction in MPG.
Trying to average 20 MPG in one of these trucks as heavy as they are would be difficult to say the least.

02-17-2011, 02:07 PM	#38
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Whats your 67-72 chevy 2wd or 4wd gettin on fuel millage? My 71 GMC SB 96 350 Vortec (about 20 grand on the motor) with 600 Holley n 350 turbo 307 rear 15/16 max on the hwy at 60/65 or below. The 69 LB 350 (65 grand on the motor) w/4 spd top loader and 307 rear is about 2 MPG less depending on how hilly it is. When I had the stock 2 barrel carb on it I could manage 16/17, but not much difference. Any MPH above that results in a drastic reduction in MPG. Trying to average 20 MPG in one of these trucks as heavy as they are would be difficult to say the least. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"



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