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Old 04-12-2019, 05:24 PM
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Default Valve guide clearance question
What valve guide clearance are you guys running for boosted combos on high hp marine builds? 11/32"

Had some issues with my turboed street car and was wondering if the clearance was too tight for my application.
Last edited by underpsi68; 04-12-2019 at 05:43 PM.
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Old 04-12-2019, 08:07 PM
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.0018 int .0020/.0022 exh. Double check that.
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Old 04-12-2019, 08:24 PM
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.0012 intake and just under .002 on exhaust and I won't use oil seals on the exhaust just to help lube guides. Who's valve are you using?
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Old 04-12-2019, 08:41 PM
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Exhaust valve https://www.cnc-motorsports.com/ferr...600-11-32.html
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Old 04-12-2019, 09:28 PM
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I'm assuming aluminum heads bronze guides.
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Old 04-13-2019, 07:15 AM
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Originally Posted by getrdunn
I'm assuming aluminum heads bronze guides.
yes
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Old 04-13-2019, 07:17 AM
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Originally Posted by 14 apache
.0012 intake and just under .002 on exhaust and I won't use oil seals on the exhaust just to help lube guides. Who's valve are you using?
I have also heard some run the seal without the spring to allow for better lubrication.
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Old 04-13-2019, 07:27 AM
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Yes no springs and the older seals teflon we would ream them. How is the finish on the stems? And what valve where sticking?
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Old 04-13-2019, 07:54 AM
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Not sure on the finish. I attached a few pictures from when I just disassembled. 6&7 exhaust valves were very tight in guide when I disassembled. On a sbf those are the center cylinders on the left bank.

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Old 04-13-2019, 09:00 AM
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who's cylinder heads?may have cheap guides in there.may have to switch them out for the higher end guides or your gonna have to loosen them up a bit more.
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