V6 Exhaust Manifold Bolt French Locks

[beerman]

FYI

Looks like somebody on Ebay is making GMC V6 exhaust manifold bolt french locks

I picked up a set haven't installed them but the do line up with my 305's exhaust bolts.


Not Mine / No Affiliation

https://www.ebay.com/itm/266124593331

Good luck

[Jim A]

What are "french locks?"

[beerman]

They are pieces of metal which have tabs that fold over to prevent the exhaust bolts from loosening. Mine are long gone, I've seen them on other trucks and like the look.

[Jim A]

Thanks. Didn't know they had a name.
I'll take a look if there are remnants on the side that has never been off.

[Prowbar]

Cool, most are buggered up or rusted through. They are good to have, as the manifold bolts are only tightened to 15-20 ft lbs.

Would be an easy part to laser cut from a piece of sheet metal.