C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

AFR Gasket Leaks

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Old Nov 25, 2011 | 12:43 PM
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Default AFR Gasket Leaks

I did a search anf found my problem very common.My AFR's Centerbolt Valve Cover gasket is leaking. AFR recomends cutting the post 1/8" to 1/4" to allow more travel / pressure on the gasket because they don't cut the thread's base deep enough.?

Anyone have and fix this problem?

Thanx
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Old Nov 25, 2011 | 01:04 PM
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I put some washers under the bolts.
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Old Nov 25, 2011 | 01:43 PM
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Originally Posted by tequilaboy
I put some washers under the bolts.
It shouldn't have made a difference because the Posts need to be trimmed about an 1/8" inch. Washeres wouldn't do anything.AFR said they didn't machine the holes deep enough so shorten the stud posts and thia will allow more clamping load on the perimiter of the covers improving the seal.
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Old Nov 25, 2011 | 03:02 PM
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And they are suppose to be one of the best... For that kinda of money they should fix.. or compensate
You for there poor QC
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Old Nov 25, 2011 | 06:03 PM
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I wonder if 1/4" would be too much ? Maybe compromise at 3/16"
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Old Nov 26, 2011 | 01:55 PM
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How hard would it be for AFR to make a simple tooling change to resolve this issue?
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Old Nov 26, 2011 | 02:22 PM
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They are proud of their pieces no doubt.....for $2K for a set of heads, I don't expect to be drilling out things/adding washes/etc....pretty much expect plug and play......

I have the AFR/TPIS heads on mine......great set of heads no doubt, I went to the center bolt valve covers since TPIS center me center bolt vs. perimeter for my 85 forcing me to buy new valve covers (my engine builder offered to tap out the heads for perimeter since I had the stock valve covers which I declined) since I thought the center bolt were an upgrade anyway.....are they??? for oil leaks, always wondered that???

Not to change the subject but looking at TPIS's website it looks like they are offering a different set of aftermarket heads now....I did not see the AFR's out there anymore???? cost factor maybe?????
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Old Nov 26, 2011 | 02:31 PM
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Originally Posted by STL94LT1
How hard would it be for AFR to make a simple tooling change to resolve this issue?
Maybe the new ones are corrected. Mine are 5-6 years old. (NOS).Beautiful heads one would think Plug & Play for the price you pay.

Were going to fix mine tomorrow I'll post how we make out. Should be an easy fix as we won't have to remove the valve covers.
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Old Nov 26, 2011 | 10:00 PM
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Mine are about 3 years old and had the same issue. Really easy fix though -- just cut about 3/16" off of the valve cover stud threads and it fit just fine.
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Old Nov 27, 2011 | 01:37 PM
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Wacked off 1/8" and it's fixed.

Thanx Guys for all your input.
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