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Old 05-22-2002, 07:04 PM
drdre drdre is offline
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Question Valve angle?

I'm rebuilding a 65 Poly 318 and I'm currently re-doing the valve train. I have 3/8" 1.60 and 2.02 valves but I need valve locks and valve spring retainers. My question is what is the valve angle for these heads?
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Old 05-22-2002, 08:06 PM
72Challenger 72Challenger is offline
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Either you're confused or I am. You don't need to know the valve angle to choose locks and retainers. The lock angle is not the same as the valve angle. Mopar performance sells locks in 8 or 10 degrees. After market sources also supply 7 degree locks. The retainers must match the angle of the locks.
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Old 05-22-2002, 09:49 PM
drdre drdre is offline
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Thanks 72challenger, I guess I'm confused, because I went to purchase locks and retainers and they asked the stem angle and I didn't know if it actually mattered or what the difference was. But there is also a standard set. Maybe I need to know how these angles interact with the valves.

Thanks
Drdre
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Old 05-23-2002, 01:21 AM
72Challenger 72Challenger is offline
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Okay. The valve angle is the angle that the valve makes compared to the cylinder bore. This is part of cylinder head design and affects the airflow into the combustion chamber. The stem angle you're refering to is actually the valve stem retainer angle, and that's the angle of the pocket in the retainer where the locks (keepers) fit. The greater the angle, the less likely for the valve to pull through the retainer. So with very stiff valve springs, you would want the 10 degree locks. With lighter pressures a smaller angle is okay.

Now, can anyone tell me the advantages to a smaller angle? Why aren't they all 10 degree? Why is the standard Mopar angle 8 degrees and the aftermarket seems to like 7 degrees?
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Old 05-23-2002, 12:25 PM
drdre drdre is offline
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Thanks 72Challenger, much appreciated this really helps things. Good question though why wouldn't it be just 10.

Thanks again and very much appreciated.

Drdre
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Old 05-24-2002, 03:45 AM
DartGT66 DartGT66 is offline
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Can answer your question just partially, Mopar used 8 degrees I believe just to be different I guess. The 7 degree locks works just fine with stock retainers.
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