best non leaking performance valve stem seals?

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May 30, 2019 | 11:37 AM

pauldana

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Race Director

Joined: May 2003

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From: California

best non leaking performance valve stem seals?

I have been fighting oil consumption for a while...

I had oil being sucked up through the valley... fixed

Had oil being sucked through the rocker arm studs... fixed

Last problem.... shitty/bad, valve stem seals

Heads are AFR 220 competition ported on a 427 Dart block..

So... In your opinions... who makes the best valve stem seals?????

May 30, 2019 | 01:40 PM

gkull

Team Owner

Joined: Apr 1999

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From: Reno Nevada

2024 C3 of the Year Finalist- Modified

I just did my AFR 210 valve guides, seals, and springs. They had the AFR factory seals. I went with the comp cams seals and springs

Just get the right diameter, but this is the same product

https://www.summitracing.com/parts/cca-529-16/

May 30, 2019 | 03:09 PM

derekderek

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From: SW Florida.

It is the guides. Seals will be a bandaid. When you pull the springs wiggle the valves.

May 30, 2019 | 03:35 PM

pauldana

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From: California

Quote:

Originally Posted by gkull

Thx George... did not know Comp had valve stem seals.... I was wanting to change the springs anyway to the conical springs the have... I ran the beehives on the 383 i last had, and they were simply put... amazing

Quote:

Originally Posted by derekderek

It is the guides. Seals will be a bandaid. When you pull the springs wiggle the valves.

heads and engine only have about 5,000 miles on it... guides themselves should be good

May 30, 2019 | 03:53 PM

pauldana

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From: California

I just got off the phone with AFR talking to them about this problem and their reply is that the oil pump is the problem
I run a high volume oil pump, not a high-pressure oil pump.
and he says with the high volume oil pump’s, they are putting too much oil in to the head and therefore it’s getting on top of the seals and then going down

May 30, 2019 | 04:59 PM

gkull

Team Owner

Joined: Apr 1999

Posts: 21,953

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From: Reno Nevada

2024 C3 of the Year Finalist- Modified

I have high volume pumps on both of my solid roller motors.
After market blocks and stock blocks with oil restrictors limit top end oiling and they work fine with every head I have ever used except for AFR. AFR never addressed their know oil return problems. I machined my AFR heads on the exhaust side of the springs into the valve cover wall and deeper than the valve spring pocket to channel oil away from the spring base and valve stem seals

I machined out the oil return holes larger and removed the drain ridge that impedes oil return

I got in trouble 15 years ago about bad mouthing AFR and their design flaws. I only wished that they would have fixed these items by now

May 30, 2019 | 05:20 PM

jackson

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Joined: Sep 2001

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From: Unreconstructed, South Carolina

I'm NO AFR expert ... but I recall AFR went from 11/32" stems to 8mm stems on many heads; big diff between .314 & .343

To facilitate a more-comprehensive search, It'll pay to KNOW guide OD, stem OD and seal height.