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LS 7deg Locks

General engine tech -- Drag Racing to Circle Track

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HDBD
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LS 7deg Locks

Post by HDBD » Sat Jun 27, 2020 12:01 pm

Looking to use PAC R655 steel retainers with a 5/16 valve that has standard square groove. Pac lists the retainer as being compatible with LS 7 deg locks. Will this work?

Walter R. Malik
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Re: LS 7deg Locks

Post by Walter R. Malik » Sat Jun 27, 2020 9:00 pm

HDBD wrote:
Sat Jun 27, 2020 12:01 pm
Looking to use PAC R655 steel retainers with a 5/16 valve that has standard square groove. Pac lists the retainer as being compatible with LS 7 deg locks. Will this work?
It fits ... I can't say whether or not it will work for you.
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BillK
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Re: LS 7deg Locks

Post by BillK » Sat Jun 27, 2020 9:51 pm

Are you asking if you can use the LS locks with the square groove valves ?? I would probably say no since the LS locks are round groove.
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Joe-71
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Re: LS 7deg Locks

Post by Joe-71 » Sat Jun 27, 2020 10:31 pm

I find the LS locks fit the 8mm stems, not the 5/16". That .002"or .003" makes a difference in clamping. Joe-71
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Walter R. Malik
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Re: LS 7deg Locks

Post by Walter R. Malik » Sat Jun 27, 2020 11:28 pm

Walter R. Malik wrote:
Sat Jun 27, 2020 9:00 pm
HDBD wrote:
Sat Jun 27, 2020 12:01 pm
Looking to use PAC R655 steel retainers with a 5/16 valve that has standard square groove. Pac lists the retainer as being compatible with LS 7 deg locks. Will this work?
It fits ... I can't say whether or not it will work for you.
I don't think I read the question wrong but, just in case...
That 8mm retainer will fit with traditional 5/16" locks.
You can not use 8mm round groove LS locks with a 5/16" square groove valve.
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HDBD
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Re: LS 7deg Locks

Post by HDBD » Sun Jun 28, 2020 10:37 am

Thanks
Its a simple solution then, use std. 7 deg 5/16 locks

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Re: LS 7deg Locks

Post by Joe-71 » Sun Jun 28, 2020 10:08 pm

When I did an installed height check with the 8mm retainer, and 5/16" radial locks, the locks sat down ~.120" in the retainer, and the valve stem was actually below the retainer, so a no go. Also, the 5/16" locks did not fit inside the 8mm retainer well enough to lock in place. You could open up them by simply pushing on the valve stem with your hand. The interference fit does not lock the valve stem with spring pressure. Joe-71
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