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Old 03-04-2003, 05:37 PM
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Post Building a TBI truck engine

I'm kicking around trying to squeeze some more ponies out of my 350 TBI in my 94 Chevy truck.
I had considered going with a Tuned Port set up, but I think it will be cost prohibitive. I was looking around at Turbo City's throttle body stuff, and it kind of sounded like a good deal to me. My truck runs well now with real dual exhaust and a chip, but I would kind of like to hear from someone that has heated up a TBI engine with success. Maybe a cam change, a set of headers, and some port matching, and a custom flowed TBI with a good air induction system. I could slap on some Vortec heads, but that would involve a little more cash outlay.
I'm also interested in hearing from anyone who has done this, and what type of camshaft they are running with the factory computer.

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Old 03-04-2003, 06:16 PM
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I have a 93 Yukon that I am considering doing the same to.

Cam/heads/intake/throttle body


The stock TBI only flows 400cfm. There is an upgrade to a 670cfm unit with 65lb injectors. Its suppose to be a good amount better.

I have Shorty headers, 3" high flow cat, 3" straight through muffler and 3" exhaust. That all made a pretty good difference. I also have some minor mods like, TBI spacer, Flex fan, AirRaid Intake, Hypertech Thermomaster chip(had it and didnt feel it did a damn thing for me)

Just had my tranny and rear end rebuilt. Have 3:73 with an Eaton posi unit. Love the way it works. Tranny was a total rebuild. Shifts firmer now.

I was also considering the ATI Procharger for it. MY Yukon is peppy but I want alot more.
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Old 03-05-2003, 06:12 AM
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Question

Does the 670cfm TB require an intake with 2.0" throttle bores? Or can you run the stock intake with the 670cfm TB? Can a stock intake be machined to 2" throttle bores?
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Old 03-05-2003, 06:35 AM
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Hmmm..


Thats a damn good question....it is suppose to work with it, bit I know the old intake could be ported easily enough.

Really not sure on that?
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Old 03-05-2003, 08:26 AM
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I have been doing the research on building a 400sb with tbi for my silverado.Here is some info that i have found. Hope they help.

www.goingfaster.com/spo/spo_technology_central.html

<a href="http://www.chevytalk.org/threads/showflat.php?Cat=&Board=UBB12&Number=348873&page=0 &view=collapsed&sb=5&o=&fpart=1]http://www.chevytalk.org/threads/showflat.php?Cat=&Board=UBB12&Number=348873&page=0 &view=collapsed&sb=5&o=&fpart=1[/URL]
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Old 03-05-2003, 08:30 PM
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Im also looking into this as well. I called Lunatti cams and they suggested a cam for mine which is #54742. He said it would have a little thump to it, very streetable with stock
convertor, headers and a chip. This is a roller cam. Im putting it in a 94 ZR2 S-10.
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