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Old 05-02-2009, 09:16 PM
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TBI 350 build....want some opinions please

i have a 88 c1500 350 w/700r4 corvette shift servos 3.73 peg leg for now. i have the block at the machine shop right now getting punched out 30 new cam bearings and what not im running a 70's model block 4 bolt main with a stock crank and rods and speed pro flat top 4 valve relief pistons, comp cam 12-249-4 .434/.444 lift stock heads and intake with phenolic tbi spacer, phenolic injector spacer, cold air, ramhorn manifolds 2 1/4 dual exhaust with 40 series flows custom chip from tbichips.com electric fan and water pump underdrive pullies no smog pump, im keeping a/c cuz im fat and like cold air, im just wanting to get some opinions on how well you guys think all this is going to work

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Old 05-02-2009, 11:13 PM
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Stock TBI plus stock TBI heads = wheeze. Great for torque, but if you're looking to upgrade HP, ditch the heads. The stock TBI only flows about 390 cfm and the heads are the lowest flowing SBC head that chevy ever made.

More cam specs would help too. Lift is only a tiny part of it, and I don't really want to sift through comps part numbers to find it. I'm fat and lazy
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Old 05-04-2009, 04:46 PM
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cam specs

http://store.summitracing.com/partde...4&autoview=sku
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Old 05-04-2009, 05:15 PM
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That cam is on the upper end of what I would use with TBI heads. The heads will definitely be holding you back a lot. That's pretty easily a 300 hp engine with Vortec heads, but more like 250 with TBI heads.

Its up to you... the TBI engines were rated at 170-200 hp over the years and they were very well-tuned for that power - meaning, if you want to get more power out of it, its not just one part holding you back, its cam, compression, and TB.
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Old 05-05-2009, 02:40 PM
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Yeah everyone ive talked to has told me that about the heads and the intake and i do plan on changing those one of these days but with the money i have in it so far i just want to get it running and then focus on other areas for a while. its not going to be a ****** motor and i know that, but i just want something thats going to spank the average ricer for now, but thanks for the input
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Old 05-05-2009, 05:56 PM
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I also noticed something else... I don't think you'll be able to burn a chip that will run with that cam. Too much overlap.
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Old 05-06-2009, 10:25 AM
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well i talked to the guy that runs tbichips.com and he seems to think that a custom chip would be just fine as long as he gets all the right specs so idk
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