MARO-MAN

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.

MARO-MAN

Nobody knows the answer to my question? Maybe I have to go to GM??

1989GTATransAm

iTrader: (3)

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.

iroc88lb9

iTrader: (1)

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.

WhiteKnight

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

iroc88lb9

iTrader: (1)

as i said earlier...the screws that hold the tpi plate on the throttle body,are a perfect match for the vette extension.

MARO-MAN

Thanks for the tips guys. I will be taking one of my TPI plate screws and find some screws hopefully. -Nick.

SOCAL-Z

Glad I found this 9 year old thread. I just ordered a aluminum TPI distributor cover and need to buy the screws for it.

jmd

iTrader: (4)

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

paulo57509

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.

SOCAL-Z

Thanks for the info I will get them at the bolt store by my house they have most everything.

Huntboy7

Hey do you have these for sale?

paulo57509

No, I do not. The one in the photo came off my extension.