Twibs415

iTrader: (8)

as stated before iv ran them loose in a bind. ran 6mm inverted onto the mmd bucket.

aidandj

iTrader: (5)

Yeah, if I needed to I could run them. But I got half and half. In the same labeled bag. And the bag I got from a distributor had the same issues. So something weird is going on. We'll see what they can ship me.

psyber_0ptix

iTrader: (4)

Please forgive my really noob question. I read something on another forum which confused me (completely different car so not sure if applicable).


Is there such thing as lash changing after torquing a head down?

aidandj

iTrader: (5)

I've heard different answers to that question. Both from people I trust know what they are doing. I'm going to measure mine in the next few weeks and see if anything changed. I forgot to measure after I installed the head.

bahurd

iTrader: (8)

I just finished my head and put it back on the block yesterday. I'll recheck valve lash this weekend cause this was asked in a different thread.

aidandj

iTrader: (5)

It was asked in my thread. And I've asked around elsewhere too. Hence my answer.

bahurd

iTrader: (8)

I was too slow... removed my link to you ^.

Madjak

Short answer: yes but not much. Not enough to matter.

If I remember correctly I think the head I did on the bench openned up around 0.5 to 1.5 thou on the most outward lifters. I'll guess it would vary per head as well depending on how straight it is.

The last rebuild I measured all lifters with the head bolted down to the block on a used but good gasket. I targeted 8-10 thou on intakes and 10-12 thou on exhaust but ended up slightly looser on a few. I'm not sure if the feeler guages I used weren't clean or the seats had oil on them but some of my exhausts measured up to 14 thou.

I think the inacuracies in measuring and steps in shim sizing means the install error is more than an untorqued head anyway. It all depends on how fussy you are and how long you want to spend tweaking shims.

btw order on the tighter spec rather than looser. I found most of my tolerances were more open than my calcs. It is better to be too large rather than too small as it is easier to sand them down to size.

aidandj

iTrader: (5)

Also if you order from supertech I found them all to be sized a bit large. So you could grind down if needed.

Madjak

I use 400 or 800 grit wet and dry stuck to a sheet of glass with a bit of oil. It only takes a short time to drop a thou or two. Max I'd take it is around 4 thou otherwise you can start tapering the shim. Just make sure you rotate the shim as you sand.

aidandj

iTrader: (5)

I used a coarse and fine diamond stone. Figure 8 patterns. Was not fun, but got the job done.

bahurd

iTrader: (8)

I just checked my head after installing. New gasket and torqued to nominal torque value. Clearance matched the values I'd written down using the same feeler gauges (.001" increments) as go/no-go.

If there's a difference it's in the "feel" so maybe a couple tenths.

konmo

iTrader: (2)

What ended up happening with the lash caps you were going to use? Did you get some replacements for the wrong sized caps? If so from which distributor?

aidandj

iTrader: (5)

I worked directly with supertech

konmo

iTrader: (2)

and you used the supertech LC-60 lash caps on the top of the valve stem correct?

aidandj

iTrader: (5)

I did. They did not have many sizes in stock.

konmo

iTrader: (2)

awesome, good to know. Thanks man! I'm going to be doing the same.