400 M block motor
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400 M block motor
Hey I am looking at buying a 79 F150 with a 400 small block in it. It has a C6 transmission and a four barrel Holley carb on it. It is only a two wheel drive. I was wondering if I bought this truck, what could I expect for MPG? Thanks
Cargo Master
Joined: Apr 2010
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From: Billings, MT
Depends on how well it is tuned. My stock '78 4x4 with a 400 and factory 2-barrel would get 12mpg or so city.
After it was a fairly modified 408 it was lucky to get 6mpg city. I think it got about 14mpg hwy both ways. Damn did it run though.
A 400 is a 335 series motor or Cleveland. It isn't a small block or an "M"
A 351 M was called such because it was a modified 400 for the 351 CI stroke.
After it was a fairly modified 408 it was lucky to get 6mpg city. I think it got about 14mpg hwy both ways. Damn did it run though.
A 400 is a 335 series motor or Cleveland. It isn't a small block or an "M"
A 351 M was called such because it was a modified 400 for the 351 CI stroke.
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captain1997
1973 - 1979 F-100 & Larger F-Series Trucks
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Jan 13, 2013 10:11 PM
PDX_F250_78
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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Jun 29, 2010 12:41 PM
maddog72
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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Dec 27, 2004 08:20 AM
Hunt-with-a-bluetick
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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Nov 18, 2003 05:32 PM
