Locking Header Bolts for SBC

[Buick Motorsports]

What are the best ones out there? My 406 loosens regular bolts with ease.

[86Cutlass383SR]

I've used both Stage 8 and the Percy's, formerly Breslin.

The Stage 8's are good if you can get the bolt in a certain position to get the lock tab and e-clip on. I had trouble getting all the tabs on.

I then bought the Percy's Split-Lock bolts. Screws in just like a regular bolt, and then after tightening, an allen set screw in the center of the bolts expands the end so it can't come loose.

I used the Percy's bolts (original maker Breslin was bought by Percy) and the aluminum Percy's Seal-4-Good Header Gaskets and never had a header gasket leak in over 2 years. No, I'm not affiliated with Percy's. I just like their products, they work!

I vote for the Percy's Split-Locks.

[Musclerodz]

We sell and use the Percy's locks in the shop. Love them. let me know if we can help

[GregWeld]

Do the Percys!

They work and never loosen... Love mine. :woot:

[Buick Motorsports]

Thanks for your input. Looks like I'll be ordering Percy's.

[The T-man]

nice...

[mnm99]

Using same here