Plenum extension cover bolt size?
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From: Good 'ol Wisconsin
Car: I've had 4 thrid gens!!
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Plenum extension cover bolt size?
What size bolts do I need for the plenum extension cover/distributor cover? I bought a cover without the hardware, just in case your wondering why I can't match up the stock bolts. 
I know they are small metric bolts. I tried a few different sizes and did a couple different searches with no luck.
TIA, Nick.
I know they are small metric bolts. I tried a few different sizes and did a couple different searches with no luck. TIA, Nick.
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From: Cypress, California
Car: 1989 GTA
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Re: Plenum extension cover bolt size?
Well I bought a tap to chase the threads on mine. Went to look for the tap and the only one I could find around that size was 4mm x 070. The reason I did not post before was that I was not a 100% sure. Seeing as no one else is speaking up I went and posted anyways.
By the way you can by the screws at www.tpiparts.net The plastic cover uses a screw with a bigger head that has a washer shape. The metal one that came on the Corvette uses a standard head. Hope this has been of some help to you.
Seeing as no one else is speaking up I went and posted anyways. By the way you can by the screws at www.tpiparts.net The plastic cover uses a screw with a bigger head that has a washer shape. The metal one that came on the Corvette uses a standard head. Hope this has been of some help to you.
Re: Plenum extension cover bolt size?
if it helps,there the exact same size as the screws used to hold the TB plate to the throttle body.
this is what i used on my 88 iroc when i bought the alum vette cover,GM dealership couldnt figure out what size they were.
this is what i used on my 88 iroc when i bought the alum vette cover,GM dealership couldnt figure out what size they were.
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Re: Plenum extension cover bolt size?
The screws for the corvette cover, you gan buy from GM for like 7 bucks a shot.... waste of money. I still havnt gotten around to finding screws for mine
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Joined: Sep 2003
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From: Good 'ol Wisconsin
Car: I've had 4 thrid gens!!
Engine: Someday again I will have another!!
Re: Plenum extension cover bolt size?
Thanks for the tips guys. I will be taking one of my TPI plate screws and find some screws hopefully. -Nick.
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From: So. California
Car: 87' IROC
Engine: 305 TPI
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Re: Plenum extension cover bolt size?
Glad I found this 9 year old thread. I just ordered a aluminum TPI distributor cover and need to buy the screws for it.
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From: Aridzona
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Re: Plenum extension cover bolt size?
BOLT. Intake & Exhaust Manifold
BOLT,INT MANIF PLNM EXTN(M4X.7). Required: 03
For: F 5.0F(LB9) (1985-1992) (1990 - 1992).
$9.42 14083852
BOLT,INT MANIF PLNM EXTN(M4X.7). Required: 03
For: F 5.0F(LB9) (1985-1992) (1990 - 1992).
$9.42 14083852
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From: Tracy, CA
Car: '87 IROC
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Re: Plenum extension cover bolt size?
If you're going to the hardware store to get them, the plenum extension screws are M4 x 0.7, 10mm long, Button head Torx with a funky captive washer.
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