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Old 05-18-2007, 05:21 PM
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sbc valve seal question

I have a 77 350 and I'm looking for recommendations on what valve seals I should use on my motor. I did a compression check on the motor and have between 120 and 135 psi. The problem is blue/gray smoke out the exhaust when I first start it and the plugs are on the black side. I have a compreesor and can change the seals without pulling the heads. Any suggestions would be very helpful.

John

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Old 05-18-2007, 05:27 PM
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Id just like to point out that I thought I had a problem with my valve seals. Turns out I need piston rings too. Just something to watch out for.

Steve
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Old 05-18-2007, 05:43 PM
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Might want to do a leakdown test to see if your rings are to blame as well BUT if its only at start up stem seals seem to be the right(easier) fix.
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Old 05-18-2007, 06:13 PM
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Fel-Pro sells SBC seals that offer excellent oil controll and heat resistance. The blue colored double band positive seal on the intake side and a white nylon umbrella on the exhaust combined with the traditional O-ring seal will stop the morning "puff"/
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Old 05-19-2007, 06:12 AM
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Fel-Pro sells SBC seals that offer excellent oil controll and heat resistance. The blue colored double band positive seal on the intake side and a white nylon umbrella on the exhaust combined with the traditional O-ring seal will stop the morning "puff"/
A friend wants me to put seals on his 64 283. The parts place told him that the bosses at the top of the head need to machined to make aftermarket seals fit. Do you know if those Fel-Pro will fit a stock head casting without maching? Thanks
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Old 05-19-2007, 07:57 AM
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Quote:
Originally Posted by F&J
A friend wants me to put seals on his 64 283. The parts place told him that the bosses at the top of the head need to machined to make aftermarket seals fit. Do you know if those Fel-Pro will fit a stock head casting without maching? Thanks
The seals that BOB is talking about are for 1981 and later heads. They will not fit (properly) earlier heads. 283 heads have an even larger guide boss than the pre-'81 SBC heads and will definitely need to be machined.

tom
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Old 05-19-2007, 03:38 PM
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Quote:
Originally Posted by F&J
A friend wants me to put seals on his 64 283. The parts place told him that the bosses at the top of the head need to machined to make aftermarket seals fit. Do you know if those Fel-Pro will fit a stock head casting without maching? Thanks

Doc here,

You might find the valves from the 64 are in need of machine shop service from years of running leaded fuel..now is wearing off the stems and guides allowing oil to pass by..

Seals MAY not cure the problem.

Doc
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Old 05-19-2007, 04:30 PM
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Doc here,
Quote:
You might find the valves from the 64 are in need of machine shop service from years of running leaded fuel..now is wearing off the stems and guides allowing oil to pass by..
Yes, I think it could use rings too. This guy is 72 years young, and he wants to try just seals first....when you grew up in the depression, you don't get spendy with your money

I have my own valve & seat grinder, but if we pull the heads, you know where it will end up, right? ......redo the entire motor, rebore, etc........

Do any of you know if any type of umbrella seal will fit without hitting the springs?? I thought I tried on one of my 4barrel 283's back in the 60s and the dual springs on that one wouldn't clear the umbrella ones. This motor is 64 chevelle 2barrel
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Old 05-21-2007, 09:05 AM
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get a set of umbrella seals from a studabaker v8 they will slide right on no machining needed. most machine shops will have em on hand works great.
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