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  #1  
Old 05-08-2010, 10:55 AM
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Default Locking Header Bolts for SBC
What are the best ones out there? My 406 loosens regular bolts with ease.
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Old 05-09-2010, 07:24 PM
86Cutlass383SR 86Cutlass383SR is offline
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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.
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Last edited by 86Cutlass383SR; 05-09-2010 at 07:28 PM.
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Old 05-09-2010, 11:28 PM
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We sell and use the Percy's locks in the shop. Love them. let me know if we can help
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Old 05-10-2010, 07:12 PM
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Do the Percys!

They work and never loosen... Love mine.
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Old 05-11-2010, 12:15 PM
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Thanks for your input. Looks like I'll be ordering Percy's.
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Old 12-13-2013, 03:22 AM
The T-man The T-man is offline
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nice...
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Old 12-13-2013, 03:36 AM
mnm99 mnm99 is offline
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Using same here
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