Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: cudabitten]
#1824154
05/11/15 02:06 PM
05/11/15 02:06 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I don't think it can be done accurately enough by hand. Crane's lash caps used to be .060", IIRC. I had to run COMPS (.080") on one bank and Cranes on the other due to some oddball cylinder head issues on one set I ran. EDIT: Still are: http://www.cranecams.com/362.pdfThe only thing is they don't have the hole in the middle and want to "stick" to the top of the valve. Make 'em a little more difficult to pull off, but they're the right thickness.
Last edited by BradH; 05/11/15 02:12 PM.
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: cudabitten]
#1824238
05/11/15 03:52 PM
05/11/15 03:52 PM
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Joined: Jan 2003
Posts: 4,294 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,294
Morrow, OH
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PM me. I would be happy do do it for you on my surface grinder next week.
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: Any reason why I cant grind a few lash caps with a dremel?
[Re: qwkmopardan]
#1824356
05/11/15 06:47 PM
05/11/15 06:47 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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Any tool and die shop. That needs to be done on a magnetic table surface grinder. If I couldnt find the right ones.. this is the ONLY way I would do it... has to be a nice surface otherwise your gonna eat rockers or the caps or both
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: cudabitten]
#1824441
05/11/15 08:38 PM
05/11/15 08:38 PM
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Joined: Jan 2005
Posts: 3,699 Newport, Mi
Evil Spirit
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master
Joined: Jan 2005
Posts: 3,699
Newport, Mi
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The magnetic table surface grinder is probably the best way, but it can be done on a valve grinding machine. Just put the lash cap on a bare valve and carefully dress the face, just as you would the stem/retainer end of a valve.
Last edited by Evil Spirit; 05/11/15 08:49 PM.
Free advice and worth every penny... Factory trained Slinky rewinder.........
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: cudabitten]
#1824793
05/12/15 08:08 AM
05/12/15 08:08 AM
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Joined: Jun 2010
Posts: 1,144 wellington ohio
68-scatpack-rt
In thin ice
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In thin ice
Joined: Jun 2010
Posts: 1,144
wellington ohio
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I need to grind .020 off 4 lash caps. I could only purchase .080 caps so now I have to remove .020 to correct for the crap head cylinder job that was done on my heads last year. (I guess he was a chevy guy?) Any reason why I cant buy an extension for the dremel and go slow with the grind checking every few seconds? I have called around to get someone to do this and I keep getting the same answer, (there is a guy I know who might be able to do this). I do have a digital micrometer. So, your idea for fixing what " a chevy guy" did is to modify your valvetrain with a dremel tool? That is rich.
unions....the folks who brought you the weekend!
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: qwkmopardan]
#1825011
05/12/15 03:29 PM
05/12/15 03:29 PM
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Joined: Nov 2003
Posts: 1,664 North Sweden
RT540
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,664
North Sweden
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Any tool and die shop. That needs to be done on a magnetic table surface grinder. Yep, that is what I did, worked great. It took me several hours, as I removed very little each stroke. Used cooling also.
Last edited by RT540; 05/12/15 03:46 PM.
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: RT540]
#1825034
05/12/15 03:52 PM
05/12/15 03:52 PM
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Joined: Jul 2010
Posts: 1,845 Tampa
DusterDave
top fuel
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top fuel
Joined: Jul 2010
Posts: 1,845
Tampa
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To the OP, if you think you can do an acceptable job with a Dremel, think again. You won't be able to maintain flatness, straightness and parallelism with the underside surface (valve side of the lash cap).
Gone to the dark side with an LS3 powered '57 Chevy 210
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: BradH]
#1825488
05/13/15 07:59 AM
05/13/15 07:59 AM
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Joined: Nov 2003
Posts: 1,664 North Sweden
RT540
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,664
North Sweden
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REPEAT: Crane sells .060" thick (not DEEP) lash caps. The PDF I linked for you above has their part numbers. I would buy a set of new Crane 060 caps. Last summer I bought the Crower set from Summit that I thought was also 060, but they where 080, the same as the old ones I already had. Then I decided to grind (my old set). Part nr for the Crower set that was wrong thickness 86121S-16.
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: cudabitten]
#1825916
05/13/15 06:00 PM
05/13/15 06:00 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Shorten the stem .020 and if the lash cap hits the lock, you can shorten the bottem of the cap on a belt sander.
Why is .020 so big a deal?
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: cudabitten]
#1826787
05/14/15 07:04 PM
05/14/15 07:04 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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Washington
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Hi MarkZ528, thanks for the offer. Bradh you are right. Crane has the right lash caps at 060 and 3/8 stem with I think 168 overall height. I called Crane direct to get these shipped for this Friday hopefully. Summit had these on a 5 week backorder. I got Comp mixed up with Crane and was calling Comp. Thanks for jogging my memory.
.020 means a lot when your spec is + - .020 I get that you are working with a tolerance. Are you saying you don't have .020 to stem off the valve instead of going through all this BS with lash caps?
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Any reason why I cant grind a few lash caps with a dremel?
[Re: madscientist]
#1826989
05/15/15 12:02 AM
05/15/15 12:02 AM
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Joined: May 2008
Posts: 958 eastern, pa.
cudabitten
OP
super stock
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OP
super stock
Joined: May 2008
Posts: 958
eastern, pa.
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Actually what happened was I had the heads done at a "professional" cylinder head shop and they gave me the heads back with every single valve stem at a different height. Since this was my first engine rebuild I had no idea to check for this and "assumed" that the shop knew what they were doing. Now the heads are installed and the engine runs fine except for about three valve taps, (I hope that's what I'm hearing). So I've been learning a lot about valve train geometry and have measured all lifter preloads and am within .009 of spec using a combination of 7.500 rods, 7.530 rods and .060 caps. This is an LA 360 non adjustable rockers...hydraulic cam.
Last edited by cudabitten; 05/15/15 12:04 AM.
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