C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Which 58mm TB?

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Old Nov 18, 2008 | 04:17 PM
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Default Which 58mm TB?

I have to upgrade to 58mm TB. I've seen many (edelbrock, BBK and even summit have one) in summit racing etc. All of them run about the same price range.

Which one should I buy? Does it matter?
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Old Nov 18, 2008 | 05:16 PM
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I have never used or seen the others bbk, etc. but I thought the as&m looked good. I ended up going with a 58mm. by TPIS. It is machined billet, ball bearings, everything fit like it should, no modding of anything, all distances for cables/linkage fits like a 48, cost was 435.
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Old Nov 18, 2008 | 05:26 PM
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those summit ones are cast and are nice for the price. cant go wrong with it

My Holley 58 did need alittle washer on each of the TPS sensor bolts to space it up alittle so it wouldnt bind on the linkage of the TB. other than that its a nice unit as well. Billet etc
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Old Nov 18, 2008 | 08:28 PM
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When working in Mesa I stopped in at AS&M and can say that their 58mm TB is a precision piece for sure.

Meanwhile I run a BBK 52mm TB in the '88 and it took repeated filing of the intake casting before the bellows would fit...
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Old Nov 18, 2008 | 08:36 PM
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Originally Posted by Orr89rocz
those summit ones are cast and are nice for the price. cant go wrong with it
They are made by Professional Products. It's a good piece for the money. The linkage works properly and the gasket surface on the 2 I have used was flat. I don't like the way the entrance ahead of the throttle blades is cast rough and machined but it dosn't really seem to hurt anything (and you could just take a die grinder/cartrige roll to it if you were so inclined).

Nolands (Blackharleyman) motor went over 420RWHP and my personal LTX better'd that. Both use the Professional Products 58mm.

There are nicer TB's out there. AS&M and TPIS are both billet but cost quite a bit more money, TOP OF THE LINE THOU. The Holley is nicer and a bit more money, but some folks have had problems with them. BBK is worse looking and cost more, too boot everybody I know with one has had problems with it.

If your saving money you can't beat the Professional Products TB. If you want the best buy AS&M or TPIS. The others don't have an advantage anywhere.
Will
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