[Shotimes] Cams and Crowbars and Cranks, oh my!

[Ian Fisher]

Well, we know that the external head castings changed
in 93. I've also heard that 93+ valves had a 5 angle
back cut vs the 3 angle that the 89-92 def. had. I
really don't know if this 5 angle stuff is true or
not. But perhaps the valve seats and valves were
machined to tighter specs in later years which should
technically lead to a smaller spread of shims across
the heads.

My 93 atx heads were roughly 2400-2500. My 90 heads
were roughly 2475?-2600. I didn't even realize that a
2650 was even made until Rich said something about it.

Ian

--- Dave Pillsbury <showerks@comcast.net> wrote:

> I've got dozens of 2575. Strange thing about running
> the shim spectrum. 
> I've seen from 2300 to 2600 in one engine. To a
> straight up 2500X24 
> shims in the last customer car we did. I thought
> that one was strange as 
> hell. Until I cracked the engine on my 95 and took a
> look at the shims. 
> 2475to2525 is the shim spread on it. but the 89
> engine here was 
> 2375-2600 and the 2300-2600 engine was my 90 the 94
> ATX that I robbed 
> the shims out of had very little spread too. It's
> either a simple fact 
> of quality got better and there was less valve shim
> difference or the 
> early engines were built better. By the way the last
> 94-95's I've done 
> were all way out of spec!
> Dave
> 
> Rich Bruso wrote:
> 
> >   Well, it looks like Lola's previous owner's
> mechanic did me another favor.  I got the car in
> '01, and in '02 (on my wedding day, no less) my
> clutch went out.  Upon inspection, it turns out the
> mechanic kept tracking down 9 1/4" clutches, so I
> got to spring for the larger bolt circle flywheel
> then.  Fun.
> >   Anyway, the same guy apparently used some sort
> of percussive maintenance tool to reinstall the
> pulley.  I've managed to strip one puller bolt and
> bend two.  Fun.  It appears the key is still intact,
> and I know the timing belt pulley hasn't slipped at
> all (good news there)  I'm just wondering if anyone
> has any experience with trying to pull a munged up
> pulley off without collateral damage.
> >   Also, after meticulous moving, checking, and
> rechecking, I've come down to some wonderful valve
> lash numbers on all but one each of the #2 and #3
> exhaust valves, both of which really need a 2575. 
> 2600 is too tight, and I'm out of 2550's.  Let me
> know if you have any spares you'd be willing to get
> rid of.
> >   Strange note.  My spare motor (out of my old
> Titanium '89) had both a 2650 AND a 2375.  Quite a
> range of shims in that motor.
> >
> >
> >-Rich Bruso
> >89 Black (Lola)
> >89 Silver (parts)
> >Sierra Vista, AZ
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