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Old 01-26-2020, 08:38 AM
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Default Valve position

Can anyone tell which of these 4 Exh valves where at the rear of this Kaufman high port head?
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Old 01-26-2020, 09:11 AM
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nope. Valve on the left or right ends of the photo.

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Old 01-26-2020, 10:04 AM
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Without seeing the head, I'd guess the wet one.

Clay

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Old 01-26-2020, 12:03 PM
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X2 oil?
Stem seal gave up?

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Old 01-27-2020, 07:10 AM
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The wet valve was at the end of the head, and the end valve from the other bank looked the same.
Both seal on each valve stem was good and held down to the guide as it should be.

This occurs on most aftermarket Aluminum heads at high rev's when you don't help out the oil drainage at the rear of each head by some means, so this is not only a issue related to only Kaufman heads by any means.

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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!

1) 1940s 100% silver 4 cup tea server set.

Two dry rotted 14 x 10 Micky Thompson slicks.

1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.

Education is what your left with once you forget things!
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Old 01-27-2020, 10:53 AM
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Because of acceleration G-force?
What's the fix?

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Old 01-27-2020, 11:22 AM
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Steve,
Is the oil drain back the problem, or is the top end seeing to much oil?

Stan

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Old 01-27-2020, 01:14 PM
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Hi gang!
It's a oil drain back problem compounded by a few factors, how much the rear of the motor is tilted which also has the factor of G forces as part of it.
How much unneeded oil that maybe getting out of roller rockers just to mention a few here.

On most of these heads I grind in a drainage trough back forwards to the drain hole and then drill that drain hole out atleast half way down so it can hold more volume and then sometimes a drain port needs to be drilled into the rear of the head with each head bank Y'ed and that line run back to the oil pan.
On some heads the drain trough needs to be ground in right under the Exh valve spring seat cup if no external drain lines can be used.

The condition shown in my picture was not making for a oil usage issue atleast in terms this motors drag strip use, but in terms of running on the street for mile after mile I would have to assume that unneeded oil usage would show up.

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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!

1) 1940s 100% silver 4 cup tea server set.

Two dry rotted 14 x 10 Micky Thompson slicks.

1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.

Education is what your left with once you forget things!

Last edited by steve25; 01-27-2020 at 01:20 PM.
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