Re: Spider cylinder head height?

[Jon Pike <jhpike@domain.elided>]

> I've been following this cylinder head height thread with some interest, 
> being in the middle of a rebuild, and after having had the good ol' boy 
> machinist I'm trying to train to take too much off when all I needed was a 
> "cleanup" (now 111.6mmm).
Ouch.. wonder if your good ol' boy will buy you another head..

> Doesn't the method suggested above ruin the head gasket, e.g., after 
> assembling (and I assume torquing) the head gasket, it will have been 
> compressed and be unusable for the final rebuild for a running engine?  I 
> thought head gaskets can only be used (torqued) once?  The alternative I've 
> heard is to run a piece of thick lead soder through the spark plug hole 
> positioning it such that it is between the piston crown and the valve, 
> rotating the engine, then pull out the soder and measure its thickness 
> where it was squeezed between the crown and valve.  What are acceptable 
> clearances?  Which valve is more likely to have clearance problems - 
> exhaust or intake?  Assume 1750 w/stock valves, 11mm intake, 10 mm exhaust 
> cams,  tight valve lash ~.014-.016..
> THanks.  Good digest topic!   ///kct, Powell, TN


Hmmm..  I'm wondering if you get the same clearance every place a valve 
gets near a piston..  i.e. if the solder dosen't go right down the 
middle line of the valve, do you get a wider than minimum reading?

And yes, this is a good topic! I'm thinking various other combinations 
and possible adjustments..  like perhaps a 2000 using 10.1:1 Motronic 
pistons, stock or maybe Euro cams, and say maybe I might try the advance 
the cam trick for greater overlap..  How far till I get in trouble?

Awaiting guru advice on some or all of these, as well as that 
fundamental question.. How close is too close??

Jon
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