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OE Big Block valve lock/retainer taper, 7° or 8° ?
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1960fury
Posted 2023-08-01 6:22 PM (#631091)
Subject: OE Big Block valve lock/retainer taper, 7° or 8° ?



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Does somebody know? It's kinda hard to measure. Looks like 7° but I'm not sure.

Edited by 1960fury 2023-08-01 6:23 PM
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mstrug
Posted 2023-08-01 8:18 PM (#631092 - in reply to #631091)
Subject: Re: OE Big Block valve lock/retainer taper, 7° or 8° ?



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7'

Isky Racing Cams VL38 Chrome Moly Split 7 Degree Valve Lock

Category: Engine > Valve Train Components > Engine Valve Spring Retainer Keeper
Description: Chrome Moly Split 7 Degree Valve Lock
Notes:

3/8 in. Stem; Chevy 396-454 V8/Chrysler B 383 And 440/Chrysler A Engines; Ford 332-428 V-8; Set of 32

https://www.ebay.com/itm/175843596491?hash=item28f11858cb:g:xm8AAOSw...

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Edited by mstrug 2023-08-01 8:32 PM
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1960fury
Posted 2023-08-02 9:26 AM (#631101 - in reply to #631091)
Subject: Re: OE Big Block valve lock/retainer taper, 7° or 8° ?



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Yes, thank you. I'm aware that 7° valve locks are available. Still need to know the OE lock angle. My Mopar Performance catalog only lists 8° or 10° degree locks. The 8° I guess is for stock retainers? Or is both 7 and 8 actually the same?
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1960fury
Posted 2023-09-19 10:10 AM (#631935 - in reply to #631091)
Subject: Re: OE Big Block valve lock/retainer taper, 7° or 8° ?



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OK, got into that and there is no mistake, unbelievable but true, OE is more like 8° and all the replacement stuff you can buy "to fit our cars" are about 7°. Now I know, why MOPAR Performance only talks about 8° Locks and retainers!

Bought a set of quality locks for Mopar Big Blocks from Rock Auto and they wobble around in the OE seats like crazy, they probably work, but are not correct. I measured them carefully up, using a formula and also used prussian blue and an adjustable conical reamer to verifie my discovery.

This is NOT a wear thing. The OE angle is steeper!

I decided to cut my Titanium retainers OE 8° as I like it better, even though I will be stuck with used OE or rare valve locks.

Edited by 1960fury 2023-09-19 10:17 AM
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mstrug
Posted 2023-09-19 12:14 PM (#631941 - in reply to #631091)
Subject: Re: OE Big Block valve lock/retainer taper, 7° or 8° ?



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What size stem is it? 8 degree: https://www.summitracing.com/search/part-type/valve-locks/lock-style...
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1960fury
Posted 2023-09-19 3:28 PM (#631945 - in reply to #631091)
Subject: Re: OE Big Block valve lock/retainer taper, 7° or 8° ?



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3/8" of course but they have to fit too. No such thing as single groove locks in the FL world, as far as far as I know.
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1960fury
Posted 2023-09-19 3:31 PM (#631946 - in reply to #631091)
Subject: Re: OE Big Block valve lock/retainer taper, 7° or 8° ?



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Are there any valve stems in the FL world, that are not 3/8" OE?

Edited by 1960fury 2023-09-19 3:33 PM
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