Thread: 1994 454 tbi help

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Turn air cleaner top plate over upside down to open air cleaner to element more----------probably already running 4.11 gears?????? little over 3000rpm cruising????????? 6 mile per gallon?????




Sorry-mine was a 1984--------------------disreguard

We'll 410 gears and about 2700 at 75mph bout to get a little smaller tires thy r stock 31 inch tires right now soon to be a set of 28 inch tires and about 7 mpg

Originally Posted by crowe45

We'll 410 gears and about 2700 at 75mph bout to get a little smaller tires thy r stock 31 inch tires right now soon to be a set of 28 inch tires and about 7 mpg

IMO you're making a big mistake changing to a 28" tire. Run the numbers on your cruise rpm change and you may be shocked. I'd be thinking of going up to 32's, 33's, or even 35's.

Rspears::: I am wanting to change gear also down to at least a 355 before the tire change and trust me I would go bigger if it was 4wd

Originally Posted by HWORRELL

I would think the cheapest way to gain some ponies is a cold air intake, good set of headers with 3 inch free flow exhaust. And find a company that can supply you with a custom burnt prom for the ECM/computer.

Originally Posted by crowe45

Rspears::: I am wanting to change gear also down to at least a 355 before the tire change and trust me I would go bigger if it was 4wd

I agree with HWORRELL, and to me the choice of gears doesn't change my opinion on the tire size for your truck. Dropping down 3" in tire OD is going to look strange in the wheel wells of the truck, IMO. That said, it's your truck and only you have to like the result.

Might try these folks for the Prom.GM TBI Products :: Parts & Accessories :: Calibration Proms & Mem-Cals - Howell Engine Developments, Inc.