Basic Tbi 5.7 Build Help

[jrfinchen1]

I have a 1992 k1500 with a 5.7 350 Tbi. The only modifications I have down to the engine so far are shorty headers with true duals and Flowmaster mufflers. I'm wanting to add just a little bit more horsepower for around $800 - $1000 Im wanting to keep the bottom end stock and keep the tbi but want to modify or slightly upgrade if possible? Im aware the heads on these are awful and I was thinking different heads and a mild cam swap. Where is a good place to start? and what Tbi mods are there? anything helps. Thanks

 

[PlayingWithTBI]

Im aware the heads on these are awful and I was thinking different heads and a mild cam swap. Where is a good place to start? and what Tbi mods are there?

There are things you can do but, they'll cost a little more than $1000. These heads are for your TBI intake bolt pattern. They flow better than Vortec heads for a few bucks more.

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If you can afford it, you should switch to a roller cam. If your block has the bosses for the spyder and cam plate you can get in pretty cheap but, if they aren't, a conversion kit with ty-bar lifters is another, more expensive option. Otherwise go with a flat tappet cam. You can call your favorite cam company and ask them what they'd recommend.

Then you'll want an AFPR and a bigger spring for your TB, so you can tune your fuel and spark tables for better performance and MPGs. Getting a bored out TB can get you more air flow so it can support higher RPMs. HTH

 

[Erik the Awful]

+1 Heads. Cam.
Call your favorite cam grinder and tell them what you want. They'll get you hooked up.

 

[Schurkey]

Best place to start is by connecting a scan tool, a fuel pressure tester, and a compression tester to the vehicle.

Make sure all the "stock" horsies are still there.

You'll waste a lot of money adding "Hot-Rod" parts to the vehicle if you have low fuel pressure, worn valves/rings, or marginal sensors/outputs.

 

[351FUN]

Make sure everything that's already on there is good, give it a good tune up. Then start here

Recommended 350 TBI modifications | TBI

Recommended 350 TBI modifications

harristuning.com

Also replacing the flowmasters with a good performance muffler would help, and so would some kind of crossover like an H pipe. You can gain noticeable power from balancing out the exhaust. Muffler technology has come a long way and there's no reason for something that restrictive. Borla is always my recommendation but I know they're pricey.

 

[GMT400MNGUY]

Swap with a 350 vortec, use a 4bl intake and adaptor plate.

 

[Joe Guldan]

Check out Harris Fuel Injection, Brian is an expert on TBI engines

 

[df2x4]

^ Personally I would advise against using Harris Performance/Tuning/TBIChips for anything. We've seen other members post first hand evidence that their tunes aren't great... There are people on the Gearhead EFI forums who can provide a much better result.

 

[351FUN]

Check out Harris Fuel Injection, Brian is an expert on TBI engines

Use the resources on the site, do not use the tuning.

 

[PlayingWithTBI]

^ Personally I would advise against using Harris Performance/Tuning/TBIChips for anything.

^^^This!