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It is currently Tue Apr 07, 2026 11:17 am
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[ 7 posts ] |
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Intake vs exhaust valve lash
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ArDuckhntr
MMT Member
Joined: Wed Jan 14, 2009 8:46 pm Posts: 39
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 Intake vs exhaust valve lash
First, yes I've already searched MMT, and even used Google/MMT search with no luck. I have a cpl of local race engine builders that suggested that I set my intake and exhaust valve different (more on the exhaust side). They said they build better power in their modded motors when they set exhaust side .002 or so more than intake. At the present time I'm running .005 on both; motor is 2015 GT 35, carb, exhaust, DPE heads, polished and matched intake and adapter. Since I'm not running a cam (yet) should I set intake at .004 and exhaust at .006?
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| Fri Dec 16, 2016 8:53 pm |
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BlueShamu
MMT Elite Member
Joined: Mon Feb 06, 2012 6:13 pm Posts: 5605 Location: D'town, LA
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 Re: Intake vs exhaust valve lash
Did you ask DPE what they recommend?
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| Fri Dec 16, 2016 8:55 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm Posts: 16915 Location: Rowlett, TX
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 Re: Intake vs exhaust valve lash
Try it. Surely ain't gonna hurt anything.
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| Fri Dec 16, 2016 8:57 pm |
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ArDuckhntr
MMT Member
Joined: Wed Jan 14, 2009 8:46 pm Posts: 39
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 Re: Intake vs exhaust valve lash
I tried to call Hoyt at GT today but called past closing time, and I figured with the LA split opening in the morn most would be at camp so I did not hit DPE up yet.
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| Fri Dec 16, 2016 8:58 pm |
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50fps
MMT 1000 Club
Joined: Tue Jan 13, 2009 6:42 pm Posts: 2377 Location: West Coast Wisconsin
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 Re: Intake vs exhaust valve lash
A large gap will allow a longer dwell time when closed, which can help with heat transfer.
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| Sat Dec 17, 2016 10:21 am |
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ArDuckhntr
MMT Member
Joined: Wed Jan 14, 2009 8:46 pm Posts: 39
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 Re: Intake vs exhaust valve lash
Well I made the change today and the motor seems to be better (in driveway), but I did not get a chance to run it top to bottom in water.
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| Sat Dec 17, 2016 5:06 pm |
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MaXXis85
MMT Elite Member
Joined: Wed Jan 14, 2009 7:23 am Posts: 6233 Location: Tarkington, TX
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 Re: Intake vs exhaust valve lash
_________________ Bayou Surface Drive 337-351-0362 Tarkington, TX 77327
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| Tue Dec 20, 2016 7:44 am |
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