takovr

Was cleaning my throttle body and the bolts that hold the lower piece to the throttle body broke off. Was wondering what size they are and were can I get new ones? These are the bolts that are applied with a torx bit screwdriver. It is off of a 1986 corvette

mlm0

Don't remember size, but bought some off eBay

Silver85

The heads on every single one of mine snapped off. I can't remember the size other than they are metric. I bought a hex head set at Home Depot to replace them with.

Joe C

the screws are M4-.7 torx, pan or round/button head. not sure of the length, but most likely between 20 and 25mm - standard, off the shelf, sizes are 20, 22, and 25mm, and if I had to guess, i'd say 20mm. as I recall, they are all the same length, and also, I vaguely recall having lock washers. again, ??? it's been years ago, but I bought replacements at my local hardware store - same, but pan head/allen recess. i also recall, a torque value of 27 INCH pounds (double check for your application). this is a case where stainless steel would be a good option.


edit: guessed wrong - not 20mm, but maybe 25mm...

Dt86

Welcome to the club

Joe C

just ran across a small zip-lock bag with three, M4-.75 x 25mm round head, allen recess that i'm thinking I bought years ago when working on my 85's TB. there were also a couple of 4mm lock washers in the bag. so, FWIW, i'm guessing the OE length is maybe 25mm.

here's a link for SS replacements...

https://www.mcmaster.com/#92095a197/=16wrppp

FrostyMountain

If your refering to the four bolts that secure the throttle body to the plenum, I have four i removed from my 85 L98 and replaced them with Stainless Allen heads. They are hex head, black flanged b olts. You can have the old ones as I have no use for them. If you want them PM me with a address and Ill send them out Monday. Im assuming 85 and 86 are the same

takovr

thx for all the info I found them