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Reply With QuoteThe 4.3 was put in a lot of trucks so we would need a idea on what year truck you have, but a rough estimate would be between 14-17 MPG depending on transmission useage and gear ratio.
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This is a discussion on gas mileage help! within the Technical / Maintenance forums, part of the General Discussion category; Finally going to put a 350 into my truck which originally had a 4.3 v6 but it crapped out on ...
Finally going to put a 350 into my truck which originally had a 4.3 v6 but it crapped out on me. My truck has a 4in lift and 33in tires. I plan on putting and economical cam, CAI and a chip in it to help the MPG
Anyone got a roundabout number i would be getting on the highway?
Also if anyone has advice on the swap that would be great too!
Thx for looking!
The 4.3 was put in a lot of trucks so we would need a idea on what year truck you have, but a rough estimate would be between 14-17 MPG depending on transmission useage and gear ratio.
1996 i plan on putting a vortec 350 in it. Its auto and stock gears. But i might put 4.11 gears in it
1996 is first year for OBD2 so your going to have the engine computer to swap with the engine. There may be other issues too so I would do a search in the engine swap thread, I am sure it has been done before.
My 1998 2wd Suburban-5.7-tiny stock 235/75 15 tires-gets an HONEST 20mpg at 60 mph(actually 21.2mpg but a lot of that is at over 3000ft altitude where mpg increases due to less air drag)
If your truck was in dead stock condition-20 mpg at 60 mph is about right.
Of course-almost no one will drive that slowly- at 70 mph I would get maybe 17-18 mpg.
But your truck isn't stock-and maybe it is 4x4 ?
Subtract 1 mpg for 4x4 in those models
Gotta subtract some for the lift-more drag
Some for bigger wider tires and probably higher rolling resistance(more aggressive tread)
Now my tires are just 28" tall-if you have 2wd-your stock tires were about the same??
If so you have to multiply your calculated MPG BY 33/28=? 12MPG X 33/28=14MPG actual
Muddybuddies numbers look right to me-14-17 depending on speed trans tire tread etc
Usually cams CAIs don't help mpg on a modern vehicle like your 1996-chips I just don't know-doubt the chip folks are better than GMs engineers in respect to part throttle FE- but...
OEM truck engineers-GM/Ford etc-awfully good at getting max efficiency from these small blocks-40 years of developement by 1996-they know their business-21mpg hy from a brick like 5200 lb 1998 Suburban-awfully good! Until I bought mine-used 5 years back-I NEVER would have believed they could get 20 mpg-ever! Yeah lotta thought went into these motors/trans etc
Luck
Charlie
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