Had to pull my motor for the 3rd time this year cause of a bad build. Pulled the pass side header off and every port looks like this. This motor seen very little run time and no boost.
What would cause oil in the exhaust ports?
- Thread starter holiks03cobra
- Start date
The heads were ported and completely redone by fox lake before he shut down. Never had this issue before that and this motor build.
If it's only the one side I'd suspected valve seals and/guides.
All that was replaced when fox lake ported the heads
That doesn't mean you can dismiss the valve seals/guides as a potential source. I had my '94 Camaro engine rebuilt by Callaway Cars in the mid-90s which included new valve seals/guides. A month later, after driving maybe 400 miles on the re-built motor, the engine died on the freeway. The issue? Bad valve seals/guides. They had to replace them. I'm not saying that your valve seals/guides ARE the issue, just don't dismiss it before checking them.
The fact that your engine was rebuilt by Fox which resulted in your oil in the exhaust ports issue certainly points to any number of causes resulting from the rebuild. An incorrectly set valve clearance can cause the guides to fail. Also, a excessively large or small valve guide clearance can cause the guides to fail.
They didn’t build the motor just ported and put new parts in the heads, sorry for the confusion. I will definitely have the new builder look over the heads and probably replace the guides and seals just in case.
What Bob said. Just because it was replaced doesn't mean they're still good.
Did you seat the rings after rebuild?
A lot of people think you need to put around no load but that’s wrong. The engine should see load right away.
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A lot of people think you need to put around no load but that’s wrong. The engine should see load right away.
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Probably not. Didn’t drive it much cause of oil pressure issues.
Ugh
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I had a head rebuilt by L&M and immediately it leaked a ton of oil into the manifold and into the cylinder. I could shut the car and pull a spark plug and it would be clean, let the car sit a few hours and pull the plug and it would have oil on it.
L&M installed viton seals and I replaced them with felpro seals which fit much tighter than the viton I removed from the head and the new vitons I had from modular head shop. I installed the felpro and no more oil issues. Very frustrating to have to do them in the car thankfully it was only 1 head on the pass side.
When I had livernois build my new heads I insisted felpro seals over the viton. No issues.
L&M installed viton seals and I replaced them with felpro seals which fit much tighter than the viton I removed from the head and the new vitons I had from modular head shop. I installed the felpro and no more oil issues. Very frustrating to have to do them in the car thankfully it was only 1 head on the pass side.
When I had livernois build my new heads I insisted felpro seals over the viton. No issues.
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