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Valve to guide clearance? #1847679 06/12/15 09:20 PM 06/12/15 09:20 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 OP I Live Here
justinp61 OP I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	What's the min/max with an 11/32" valve stem, bronze guide in an aluminum head?

Re: Valve to guide clearance? [Re: justinp61] #1847826 06/13/15 12:38 AM 06/13/15 12:38 AM
Joined: Jul 2012 Posts: 429 Washington skrews mopar
skrews mopar Joined: Jul 2012 Posts: 429 Washington	Intake 1.4-1.6 thou Exhaust 1.6-1.8 thou These are the target numbers I was taught to shoot for. I've read that some people run them as tight as .8 thou, and as loose as 3.

Re: Valve to guide clearance? [Re: justinp61] #1847898 06/13/15 02:54 AM 06/13/15 02:54 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Race motor or street motor? Which fuel also? Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Valve to guide clearance? [Re: justinp61] #1847959 06/13/15 10:52 AM 06/13/15 10:52 AM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 OP I Live Here
justinp61 OP I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Street/strip, pump 93.

Re: Valve to guide clearance? [Re: justinp61] #1848029 06/13/15 12:51 PM 06/13/15 12:51 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I use .001 clearance on the 11/32... alum head with bronze type inserts

Re: Valve to guide clearance? [Re: justinp61] #1848078 06/13/15 02:15 PM 06/13/15 02:15 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 OP I Live Here
justinp61 OP I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	My guides are worn top and bottom, more so across than end to end head direction, understandability. I just got these heads back from being ported and a new valve job so if the guides have to be replaced they'll need another valve job. It sucks because I told the head guy to do what ever was needed to get them in good shape. I'll call him Monday. The two guides I measured were .0018 & .0015 in the center, the top .0028 & .0039, the bottom numbers were similar to the tops.

Re: Valve to guide clearance? [Re: justinp61] #1848202 06/13/15 05:59 PM 06/13/15 05:59 PM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Originally Posted By justinp61 Street/strip, pump 93. On those uses looser is better than to tight, trust me on that. I would, and do, shoot for .0017 to .0020 on the intakes and .0018 to .0022 on the ehxaust to start with for street and strip aplication on todays pump fuel On drag race motors on leaded fuel I shoot for tighter, similar to Mike(MrP) suggestion Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Valve to guide clearance? [Re: justinp61] #1848485 06/14/15 01:28 AM 06/14/15 01:28 AM
Joined: Mar 2006 Posts: 9,852 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,852 MI, usa	Originally Posted By justinp61 My guides are worn top and bottom, more so across than end to end head direction, understandability. I just got these heads back from being ported and a new valve job so if the guides have to be replaced they'll need another valve job. It sucks because I told the head guy to do what ever was needed to get them in good shape. I'll call him Monday. The two guides I measured were .0018 & .0015 in the center, the top .0028 & .0039, the bottom numbers were similar to the tops. I just saw this on a friends heads as well. Heads were ported with the head guy told to do what ever it needed. The motor failed (other issue) after 6 passes. Valve stems are worn over .005". Did that happen in 6 passes? I think not. Doug

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