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1989 Suburban Engine Upgrade

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Old September 21st, 2013, 3:16 PM
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Post 1989 Suburban Engine Upgrade
I have an 89 Suburban 2500 with a 350 engine and 400 transmission. These trucks were not cheap on gas, so looking for an engine upgrade that would give me better mileage. I hear the newer engines deliver close to 20 MPG hauling and 25 MPH city driving.

Has anyone upgraded this vintage van to a newer engine?? I'd sure like to know your experience.

Thanks very much!! Post info here or send PM.
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Old September 21st, 2013, 11:01 PM
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Go to Proformance Unlimited website. They have a Chevy 350 EFI tuned for 20 mpg
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Old September 22nd, 2013, 12:04 PM
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Thanks very much! I'll check it out.
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