Is a TB upgrade needed for a 402?

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May 9, 2005 | 01:36 PM

Gold Phoenix

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Is a TB upgrade needed for a 402?

I plan on sticking with the stock LS6 manifold for now. But I want to know if it is worth it getting a ported or aftermarket TB? Any recommendations?

May 9, 2005 | 01:58 PM

freakynipples69

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A ported TB is always better than a stock one. I'd just port and polish it myself if I were you.

May 9, 2005 | 02:02 PM

cyphur

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i highly suggest ported tb's on STOCK motors. hell yes you should get one for your 402!

May 9, 2005 | 08:24 PM

M6HuggerSS

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if i were you....get some dyno numbers with the LS6 and stock TB.....

then i would fork over the $$$ and get a 90/90 FAST set-up... i think you would see some very nice gains with you 402!

May 9, 2005 | 10:25 PM

Gold Phoenix

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I was going to wait on the FAST setup until I get my supercharger. I guess what I am asking is which TB? Ported, AccuFab 75mm, BBk 80mm, or TPIS Oval? The ported is the cheapest to replace when I goto the FAST intake. Both the 75 and 80 are almost the same price. TPIS is too much if I am going to FAST later.

May 9, 2005 | 10:33 PM

WS6FirebirdTA00

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i have a jantzer ported tb and its great, anythign that is ported and smoothed out in there will help a lot

May 9, 2005 | 10:35 PM

tripps

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would suggest going with Bo white, but he's no longer on the porting scene

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May 10, 2005 | 01:38 AM

JZ'sTA

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BTW yes you need a ported TB.
I would save up and buy a 90mm intake and TB combo as that motor needs to breath.

May 10, 2005 | 06:20 AM

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Gold Phoenix

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How do these ported pieces mentioned compare to Thunder Racing's ported TB? How does AccuFab's 75mm or BBK 80mm compare to ported TB?

Last edited by Gold Phoenix; May 10, 2005 at 06:28 AM.

May 10, 2005 | 08:24 AM

#11

WS6FirebirdTA00

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from what i have read, dont get bbk

May 10, 2005 | 09:23 AM

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freakynipples69

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I'd check out shaner's ported TB. Thats what I have and very happy with it.

May 11, 2005 | 04:19 AM

#13

Gold Phoenix

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I am thinking about the FAST 78mm. Does it bolt-on to the LS6 manifold? They have them with and without the TPS sensor. Should I get it with the TPS? My thought is I can use it when I upgrade to the LSX intake with the supercharger.

Last edited by Gold Phoenix; May 11, 2005 at 08:25 AM. Reason: Different question

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Is a TB upgrade needed for a 402?

Is a TB upgrade needed for a 402?

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