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#21657 08/20/2003 3:32 AM | Joined: Dec 2001 Posts: 215 Shop Shark | | Shop Shark Joined: Dec 2001 Posts: 215 | just wondering if
higher compression would lower top MPG a at 55-65 MPH in my brothers 67 3/4 ton chevy whith 283
the strange thing is is that this truck has
4.56-1 gears a turbo400 and 283 was this stock?
it will only do 60 mph and get poor milage.
he plans to swap to 3.73-1
swap the large Holly carb
for somthing whith better milage
and mabe juice up the engine a littel
if possible | | |
#21658 08/20/2003 4:35 AM | Joined: Aug 2000 Posts: 523 Member | | Member Joined: Aug 2000 Posts: 523 | All things being equal higher compression should provide better mileage | | |
#21659 08/20/2003 5:08 PM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | Go to mortec.com to ID the engine. The 4.56 gears are eating gas. Stock carb would have been a Rochester Q-jet on spreadbore iron intake.
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
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