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Re: Offset head dowels for BB? Minimum radial valve clearance?
[Re: BradH]
#1964518
12/06/15 07:51 PM
12/06/15 07:51 PM
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Joined: Jan 2003
Posts: 4,270
Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,270
Morrow, OH
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Two related questions:
1. Does anyone sell (or can make?) offset cylinder head dowels for BB Mopars? I think for BBs they're only .250" OD, and the smallest offset dowels I see listed anywhere are ~ .310" for SBM / SBC.
2. What is the recommended minimum radial valve clearance (clearance between edge of valve and valve relief in piston)?
Thanks,
Brad The offset dowels are easy to make with an offset jig on a surface grinder. My surface grinder is down right now or I could make them for you. I am replacing my old manual one with a hydraulic unit but am rebuilding it before I put it in service. I am a month or two away from finishing it.
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
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Re: Offset head dowels for BB? Minimum radial valve clearance?
[Re: BradH]
#1964926
12/07/15 03:06 PM
12/07/15 03:06 PM
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Joined: Nov 2003
Posts: 5,160
Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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I was thinking bbc was the same. I have a friend that has made the offset dowl pins. One thing to remember is at some point you have to enlarge the bolt holes also. If I was going for optimum performance I would sonic check the block and cnc the cylinder bores as high as possible along with the offset dowels.
Getting old just means you were smarter than some and luckier than others.
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Re: Offset head dowels for BB? Minimum radial valve clearance?
[Re: BradH]
#1964940
12/07/15 03:51 PM
12/07/15 03:51 PM
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Joined: Oct 2007
Posts: 4,205
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,205
New York
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you have to enlarge the bolt holes
X2 - with the dowels in place you want the bolts to slip into the head with effort.
Boffin Emeritus
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Re: Offset head dowels for BB? Minimum radial valve clearance?
[Re: dannysbee]
#1964993
12/07/15 05:06 PM
12/07/15 05:06 PM
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Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
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I was thinking bbc was the same. I have a friend that has made the offset dowl pins. One thing to remember is at some point you have to enlarge the bolt holes also. If I was going for optimum performance I would sonic check the block and cnc the cylinder bores as high as possible along with the offset dowels. BB chevy are no where near the same as the ones on our B, RB and gen2 hemi motor, they won't work 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Offset head dowels for BB? Minimum radial valve clearance?
[Re: BradH]
#1965130
12/07/15 09:31 PM
12/07/15 09:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Brad.. when you do find your off set pins make sure they set down flat on the block without the gasket.. I've been there before when the head didnt 
Last edited by MR_P_BODY; 12/07/15 09:31 PM.
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Re: Offset head dowels for BB? Minimum radial valve clearance?
[Re: BradH]
#2647089
04/20/19 03:07 AM
04/20/19 03:07 AM
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Joined: Jan 2010
Posts: 236
upstate, New York
jvcuda
enthusiast
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enthusiast
Joined: Jan 2010
Posts: 236
upstate, New York
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Two related questions:
1. Does anyone sell (or can make?) offset cylinder head dowels for BB Mopars? I think for BBs they're only .250" OD, and the smallest offset dowels I see listed anywhere are ~ .310" for SBM / SBC.
2. What is the recommended minimum radial valve clearance (clearance between edge of valve and valve relief in piston)?
Thanks,
Brad found this in the archives from dec 2015
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