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.

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.pdf

The 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.

Plenty here.

http://www.summitracing.com/search/part-...;kr=Lash%20Caps

Any tool and die shop. That needs to be done on a magnetic table surface grinder.

This is what I read. It should be done on a magnetic surface grinder. As for the Summit site, it is incorrect. I called Manley, Comp, and Crower directly and verified that they only sell .080. The dimensions on Summit are addressing the "skirt", not the lash difference.
I will look for tool and die shops again, but I have a feeling I will be doing this myself.

PM me. I would be happy do do it for you on my surface grinder next week.

REPEAT: Crane sells .060" thick (not DEEP) lash caps. The PDF I linked for you above has their part numbers.

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

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.

i learnt the hard way about lash caps. make sure you buy the same brand lash cap & valve locks. i had a mix of Crower & comp Cams. caps were breaking & doing all sorts of mayhem til i threw them all out & started again. my advice is don't risk it. the cost of the right caps & locks is cheaper than any damage they do that you have to repair.

So, your idea for fixing what " a chevy guy" did is to modify your valvetrain with a dremel tool? That is rich.

Yep, that is what I did, worked great. It took me several hours, as I removed very little each stroke.

Used cooling also.

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).

I had to use large OD washers around each lash cap to get them to stay in place and get more magnetic force.
Only had four in a row.

That doesn't look like any Dremel tool I've ever seen.....

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.

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?

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?

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.