Percy's Split Lock Bolts

[roadmonster]

I posted this a few days ago under a different thread and got no responses. I'm looking for a set of header bolts that are easy to install and won't need retightening because of them backing out.

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Has anyone had or got any feedback on Percy's Split-Lock header bolts? I've had a hard time deciding what type of bolt to use that won't back out. I've heard the ARP bolts back out (even if you chase the thread). I've heard the Stage 8 are a pain to install. I just ran across the Split-Lock. What do you guys think?

[BTC]

I have the Breslin split locks, which is the company, design, or patent, that Percy's bought. I don't have any experience with the Stage 8's. If you're looking for a locking bolt, I would guess the Percy's are a much better design. I know it won some awards when it was introduced by Breslin.

I had to grind down the box end of a 3/8" 12 point wrench to get it between some of the primaries and bolt heads.

[MeanGreen94Z]

get the stainless ARP 5/16 head SBC bolts, i put mine in tightened them pretty tight and re did them the next day when it was warm and they have been tight for 2 months

[roadmonster]

Originally Posted by BTC

I have the Breslin split locks, which is the company, design, or patent, that Percy's bought. I don't have any experience with the Stage 8's. If you're looking for a locking bolt, I would guess the Percy's are a much better design. I know it won some awards when it was introduced by Breslin.

I had to grind down the box end of a 3/8" 12 point wrench to get it between some of the primaries and bolt heads.

With the aluminum, do they gall the threads at all?

[Bowtie_Z28]

I would actually recommend getting on ebay and searching for "nascar style header bolts"

These are a small head bolt and make installation a billion times easier. Tighten them down and retighten/check once a week for about a month and you will never have to mess with them again.

The righten and recheck once a week for a month goes the same for even locking bolts as they will still loosen.

[roadmonster]

Originally Posted by Bowtie_Z28

I would actually recommend getting on ebay and searching for "nascar style header bolts"

These are a small head bolt and make installation a billion times easier. Tighten them down and retighten/check once a week for about a month and you will never have to mess with them again.

The righten and recheck once a week for a month goes the same for even locking bolts as they will still loosen.

How easy is it to get the safety wire through the bolt heads?

[Bowtie_Z28]

The Nascar style ones do not have a locking mechanism on them.

As for the ones that do have the locking mechanism on them it is a PITA to get them on. At least my experience with the Stage 8 locking header bolts it has always been a pita and alot of people eventually just don't put the locks on them at all when they find out what a PITA it is.

[BTC]

Originally Posted by roadmonster

With the aluminum, do they gall the threads at all?

I can't say either way with absolute certainty. They aren't expanding a great deal when you lock them. If you want a locking bolt, I think it's the best design available.

[roadmonster]

thanks guys

[Joonejune]

I just got the Percy's, I'll let you know if they are really worth the $.

[roadmonster]

Originally Posted by Joonejune

I just got the Percy's, I'll let you know if they are really worth the $.

Thanks - I definitely want to know.