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

89 Throttle Body Bolts

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Old Mar 11, 2004 | 03:13 PM
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Default 89 Throttle Body Bolts

Anyone know the diameter, length, and tpi of the 4 bolts that attach the 89 throttle body to the plenum?

About two years ago I installed a Helix plenum spacer (waste of $$) and I'd like to take it out and restore the TB to stock form....but the stock bolts are miles away in NC!!
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Old Mar 11, 2004 | 03:15 PM
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Default Re: 89 Throttle Body Bolts (Midnight89)

How thick is the spacer? Can you use some washers for now?
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Old Mar 11, 2004 | 03:40 PM
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Default Re: 89 Throttle Body Bolts (scorp508)

Thanks for the reply Scorp.

The spacer is almost 1". I just called the dealer and they were able to give me the size.....M8 x 1.25 x 70.

I'm going to try to find these at an auto parts store....you have to order a bag on 10 from the dealer for around $16.00!! Yeah right!!
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Old Mar 11, 2004 | 09:44 PM
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Default Re: 89 Throttle Body Bolts (Midnight89)

Midnight: Go to a Sears Hardware store and just buy the hex head metric bolts. Paint these dudes black and no one will see the difference. Use these until you get the originals from NC.

SAM
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Old Mar 11, 2004 | 10:39 PM
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Default Re: 89 Throttle Body Bolts (Sam Lam)

Thanks Sam Lam. Just got four from Home Depot. Total cost: $1.12.

Sounds like the dealership was really cutting me a deal!! For $16.00 they must sell "special horsepower" bolts to go along with my airfoil and throttle body spacer!!
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