Did the 69 L71 come with the stainless locks

[george culolias]

and washers on the exhaust manifold bolts? And would you guys suggest anything between the heads and the manifolds? Silcone? Gaskets? Bare?

[Dick W.]

Re: Did the 69 L71 come with the stainless locks

George, the french locks were stamped carbon steel. Manifolds should be manifold to head with no gaskets. I have used Permatex Ultra Copper silicone and carefully wiped the excess off. If you do this be sure that no excess shows, 'cause us eagle (evil??) eyed judges will see it.

[Dick W.]

Re: Did the 69 L71 come with the stainless locks

George, the french locks were stamped carbon steel. Manifolds should be manifold to head with no gaskets. I have used Permatex Ultra Copper silicone and carefully wiped the excess off. If you do this be sure that no excess shows, 'cause us eagle (evil??) eyed judges will see it.

[John C.]

Re: Did the 69 L71 come with the stainless locks

I don't believe french locks were used on any big blocks in 69.

[John C.]

Re: Did the 69 L71 come with the stainless locks

I don't believe french locks were used on any big blocks in 69.

[Joe L.]

Re: Did the 69 L71 come with the stainless locks

john-----

Yes, I agree. In fact, I don't think that french locks were used after some time in 1967 for big blocks and right through the end of production. Instead, special locking bolts were used for the end runner bolt positions.

[Joe L.]

Re: Did the 69 L71 come with the stainless locks

john-----

Yes, I agree. In fact, I don't think that french locks were used after some time in 1967 for big blocks and right through the end of production. Instead, special locking bolts were used for the end runner bolt positions.

[Dick W.]

Re: Did the 69 L71 come with the stainless locks

Oops! I just saw the L-71. Did not notice the year. Been working on a '67 L-71 all day and had '67 on the brain.

[Dick W.]

Re: Did the 69 L71 come with the stainless locks

Oops! I just saw the L-71. Did not notice the year. Been working on a '67 L-71 all day and had '67 on the brain.

[george culolias]

What was special about the bolts?

I ordered some 427 manifold bolts from Corvette central and they just look like normal bolts. How do they lock?

[george culolias]

What was special about the bolts?

I ordered some 427 manifold bolts from Corvette central and they just look like normal bolts. How do they lock?

[Joe L.]

Re: What was special about the bolts?

George-----

The special bolts have a "distorted" thread which "locks" in much the same way as a distorted thread lock nut. These bolts have a flanged head, too.

It's really easy to tell if you have the lock-type bolts. Take a new 3/8-16 ordinary, non-lock-type nut. Run the bolt into the nut. If you can easily turn the bolt all the way to the end of the threads of the bolt, then you DON'T have the special lock bolts. If you cannot turn it very far, then you DO have the special lock bolts. It's that simple. It's virtually impossible to discern the difference by just looking at the bolts/threads.

[Joe L.]

Re: What was special about the bolts?

George-----

The special bolts have a "distorted" thread which "locks" in much the same way as a distorted thread lock nut. These bolts have a flanged head, too.

It's really easy to tell if you have the lock-type bolts. Take a new 3/8-16 ordinary, non-lock-type nut. Run the bolt into the nut. If you can easily turn the bolt all the way to the end of the threads of the bolt, then you DON'T have the special lock bolts. If you cannot turn it very far, then you DO have the special lock bolts. It's that simple. It's virtually impossible to discern the difference by just looking at the bolts/threads.

[george culolias]

Joe, you are the man! Again...thanks! *NM*

[george culolias]

Joe, you are the man! Again...thanks! *NM*