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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Wed Jul 30, 2014 6:32 pm Post subject: eating valve seals? |
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Problem seems obvious now, but neither myself or the machine shop caught it when I had my heads checked out.
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Wed Jul 30, 2014 6:37 pm Post subject: |
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Swapped to LS6 beehive springs and comp cams retainers that do a better job of centering the valve springs. All is running good again so far. I was begining to think smokey SBCs are just my thing! |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Wed Jul 30, 2014 7:17 pm Post subject: |
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Nice upgrade! |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Wed Jul 30, 2014 7:46 pm Post subject: |
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Thanks! I figured they would work well. And the GM beehives are pretty well priced |
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Quasi-Traction "I have petals"
Joined: 24 Oct 2005 Posts: 3873 Location: stumptown
1986 Chevrolet Camaro Berlinetta
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Posted: Thu Jul 31, 2014 8:16 pm Post subject: |
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Sesschy. no more smoke then? |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Fri Aug 01, 2014 9:42 am Post subject: |
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Nope, so far so good. I was getting pissed when my rebuilt engine started puffing after 3k miles. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Wed Aug 20, 2014 9:51 am Post subject: |
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I guess Ive traded one set of problems for another..
Any ideas on what caused this?
There is one retainer in each head that has cracked and broke, and I can see one retainer with a hair-line crack and it looks ready to break.
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Aug 21, 2014 10:08 am Post subject: |
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Nobody ever run into this problem? Having trouble finding an answer. So far people think I over-revved it, or possibly using the wrong keepers. _________________
'88 FORMULA |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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Posted: Thu Aug 21, 2014 10:24 am Post subject: |
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Off the top of my head. How is the roller/valve alightment? did you check that when you installed everything? Any strange wear or interference marks anywhere in the valve train?
Coil bind ??? seems far fetched, those beehives shouldn't coil bind at the kind of lift you are probably running.
The retainers/locks would be a big issue, if you have say 7* locks, and 9* retainers. |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Thu Aug 21, 2014 10:48 am Post subject: |
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Have you called Comp to see what they say about it? |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Aug 21, 2014 1:25 pm Post subject: |
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Been reading up and found that the retainers I installed (comp 774) are actually for a Gen III LS engine. I was supposed to get comp 787 retainers says for (non Gen III)
Soooo that could be a thing....
I think SBC's and LS have a different sized valve stem
quick search says LS uses a 8mm or 5/16" valve stem and SBC uses 11/32" |
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