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Author Topic: Valve stem seals  (Read 1439 times)

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Katz427

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Valve stem seals
« on: June 30, 2018, 03:32:46 PM »
Well , this is not an FE, instead AFR heads on 351 SBF. The valve stem seals are gone after about 1200 miles. Looks like many did not stay seated on the guide and consequently were destroyed.
Anyone have a preference for the stem seals?
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My427stang

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Re: Valve stem seals
« Reply #1 on: June 30, 2018, 03:40:22 PM »
I buy Viton seals from US Seal in bulk, but if they didn't stay put, and were the right size for the guide, I would look close to make sure the inner spring isn't hitting them or your retainer design isn't hitting at max lift.
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Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch

Katz427

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Re: Valve stem seals
« Reply #2 on: June 30, 2018, 07:38:24 PM »
I don't believe the heads were touched, basic AFR package of springs, seals, retainers. I will check . Just checking comments on AFR and Summit racing, a few have had the problem.
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