Heatmaker

This is the 99th time I've had to replace the valve seas on my AFR's. These things use those rubber valve seals with the bands and they are crap. They come loose all to easily. Does anyone know of a valve seal that's better reccomended for AFR heads? I can't be the only one.

-AFR LT4 Series heads-

MachinistOne

Yeah - those seals are junk, I believe that the guide boss is .530" on those, and you should be using a 530V metal clad viton seal. You need to confirm the seal boss sizing with a verniers.

Heatmaker

Thanks Machinistone... I feel comfortable knowing I'm not alone.. atleast... now to waste more money.

rskrause

At the risk of stating the obvious: also make sure the seal ID is correct for the valve stem, typically 0.3415" (nominal 11/32") on a SBC. Also, depending what springs you are using, interference between the OD of the seal and the ID of the spring can be an issue.

Lots of people sell seals in the correct dimensions. I am using Manley pn 24045. These look suspiciously like many other brands - I suspect the same factory is making all of them. I can't remember if I had to machine down the OD of the valve guide or not. Measure, as was already said.

Rich

JustNO

OMG!! Could that be the reason of my oil burning? It is just 2500 miles on my new engine (with 210cc AFR Heads) and at startup or at WOT it burns oil like a hell!!!

Heatmaker

I'm willing to bet... when I pulled the seals I replaced them with new seals direct from AFR. thier PT# 6611 valve stem seals... the specs on the heads say PT# 6612 which are the LS1 seals, but they are actually the6611's" .530 11/32 that come on there...interesting enough. when I pulled the seals even the ones that did not come loose and were on pretty tight had oil underneath of them when I checked.

Thanks for all the help guys time bring out the tools and the ordering catalog.

JustNO

Oh yes yes It says #6612, but it isn't huh? Okay so can you let me know which seals will you order?

Heatmaker

yeah.. after I called and talked to one of thier technicians he sent me the 6611's and surprise surprise they are the exact same ones as what I took off the heads... pure Junk!

I'm thinking about trying these valve seals... do any Guru's on here think they would be a problem? hate to find out the hard way.

http://store.summitracing.com/partde...5&autoview=sku

The funny thing about all of this is that I still haven't ran through emissions yet. The cam lobe is bad enough... but I don't think I'll sneak by with clouds of smoke pouring from my exhaust.

JustNO

So the part number #MAN-24045-8. Manley is a good brand, I think I will get these. So Have you got blue smoke problem as mine right?

My car burned 1 liter in 300 miles! I hope the only problem is these valve seal, not my piston rings also.

MachinistOne

Those are the seals I use, but I get them direct from the source which is US Seal Company - Not manley. They work very well.

Heatmaker

hmm... is there a cheaper place to get these?

JustNO

Any update?

Heatmaker

The Manleys work, and they do thier job very well!

JustNO

Thats great, no any blue smoke right?

Heatmaker

hahah well... I still have the blue smoke... I was also leaking oil from my intake also . But my valves are oil free. No oil leaking past the seals this time. The notable difference in the Manleys VS. The AFR's is that the Manley's don't flex like the rubber AFRs do... so when the valve is going up and down, they do thier job better.