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Old 10-26-2020, 09:26 AM   #1
dono50
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Arrow 8BA valve question

What is the difference between the intake/exhaust valves used in the 49-50 engines and the valves used in the 51 engines. Have different part #’s. Are they interchangeable ?

Last edited by dono50; 10-26-2020 at 09:57 AM. Reason: Clarification
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Old 10-26-2020, 10:04 AM   #2
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Default Re: 8BA valve question

Ttt
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Old 10-26-2020, 10:13 AM   #3
GOSFAST
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Default Re: 8BA valve question

Quote:
Originally Posted by dono50 View Post
What is the difference between the intake/exhaust valves used in the 49-50 engines and the valves used in the 51 engines. Have different part #ís. Are they interchangeable ?
Some use "valve-rotators" depending on the years, some don't!

If you change the valves you need the corresponding retainers to go with that specific valve!

Thanks, Gary in N.Y.

P.S. Personal preference here we don't use the "rotators" on any of our builds, our choice!
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Old 10-26-2020, 11:04 AM   #4
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Default Re: 8BA valve question

Thanks, Gary
You know your stuff!
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Old 10-26-2020, 11:10 AM   #5
big job
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Default Re: 8BA valve question

For many recent years mfg. like seal power you get the same valve an exhaust valve.
later engines use rotators some have valve seats some do not. I do not know what
you are doing far as a valve job, but all kits are available. As gosfast said you don't
need rotators but thats your choice . I think, simply put what ever you take out just
replace with the same thing. Then lifters: adjustable lifters may look easy but watch
out cause of cheap china stuff now a days as well as valve guides total junk. So do it
right and only once use genuine parts they are out there.... sam
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Old 10-26-2020, 02:07 PM   #6
dono50
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Default Re: 8BA valve question

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Thanks, big job, got it all figured out.
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Old 10-26-2020, 02:08 PM   #7
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Default Re: 8BA valve question

I try to use rotators on all my street builds. This uses a shorter valve and speing and works well on a cam with .350" lift or less. I hadd a /050" shim to the spring. When doing this make sure toy check spring installed height pressure, which comes in at around 45/50 lbs. I've used this with the Max 1#, and should work with the 1007B. Street engines din'r see hi revs so the added weight of the rotators doesn't matter and the rotatores extend the life of the seat.
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