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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Bored TB

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Old 09-05-2007, 10:50 PM
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Default Bored TB
Hey if anyone out there bores TB hit me up i wanna bore my stock one to 52mm Thanx.
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Old 09-06-2007, 12:05 AM
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The question is, how much do you want to spend? Because bored stockers are cheap on eBay.
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Old 09-06-2007, 01:19 AM
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^^^^X2
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Old 09-06-2007, 01:03 PM
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Well should i buy a stocker or an aftermarket?
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Old 09-06-2007, 09:08 PM
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For 52mm, buy a ported stocker. For 58 you have no other choice than aftermarket.
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Old 09-06-2007, 10:53 PM
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What changes would i have to make tunnig wise from 52 to 58?
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Old 09-06-2007, 11:30 PM
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The first thing you would have to do is bore the manifold, since stock is 52mm. If your sig contains all your mods, I am not sure why you would have to retune.
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Old 09-07-2007, 06:19 AM
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Even going to 52, assuming you're an A4 car, you'll need to change the tunning to accommodate the extra airflow in conjunction with the line pressure. Since that's being done, you might as well have the car tuned anyways
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Old 09-07-2007, 04:05 PM
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Thats true aight cool thanks but it does already have a madZ28 tune and stuff.
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Old 09-07-2007, 08:39 PM
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Originally Posted by PEZ97T/A
Thats true aight cool thanks but it does already have a madZ28 tune and stuff.
Doesn't matter. He'll have to re-tune it.
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Old 09-07-2007, 10:21 PM
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O aight coo thanx for the help.
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Old 09-07-2007, 10:39 PM
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Aight Cool thanx.
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Old 09-07-2007, 10:45 PM
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Stock is 48mm. You will have to open up the intake to accept the 58mm tb.
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Old 09-07-2007, 11:01 PM
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EDIT: sorry, misread the post above me.

A 52mm will bolt right up with no alterations needed because though the stock tb is 48mm, the openings on the manifold are 52mm. For a 58 you wil need to port the intake.
Last edited by nighthawk15; 09-07-2007 at 11:10 PM.
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Old 09-08-2007, 10:04 PM
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o ok coo so 52 bolt on sweet so what are the better ones out there like i kno holley is good and bbk but which would yall recomend.
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