Peter,
Don't get me started on compression and head milling, again. If you recall,
I did a disertation a few months ago on the "high compression" head I bought
for my Spit. After 2 blown head gaskets and a broken piston, I changed
heads and am very happy, since then. You may have a bit more success than I
had, however, based on the following:
1. I am running high compression "flat top" pistons. This further adds to
the compression.
2. You may have the stock "dished pistons" and shaving the head may bring
the compression up to a reasonable amount. Mine amounted to 260 psi or
higher on all 4 cylinders.
3. You likely won't shave off the over 1/4 inch of metal from your head
that the dope who sold me the head did.
My recommendation is to treat the cause and not the symptom. In other
words, find out what is causing the lack of adjustability and replace the
problem part(s). After all, it's a lot easier to take metal off, but far
more difficult to put more on.
I'm wondering if there is something keeping the rocker pedestals from going
all the way down to the head. That would be a posibility. Also, if the
problem is limited to one particular pushrod, it may infact be the lifter or
the cam itself. If it is spread across the entire array, It must be in the
way the pedestals or rocker arms are mounted.
Let me know how things come out.
Joe Curry
Peter Lucas wrote:
> First off, thanks to all who responded to the question regarding the
> length of Spit pushrods. (1500 vs. 1300). The general concensus is that
> the're all the same length. I just replaced the [1300 head] on my 1500
> engine with a [1500 head]. When assembling the 1500 head to the 1500
> engine using the rocker assembly and pushrods from the 1300, I ran into
> a problem with pushrod reach. After full rocker arm adjustment, there is
> still too much of a gap between rocker and valve. I'm almost tempted to
> mill the head down a bit to bring up the compression- which would also
> take care of the pushrod problem. With todays gas, has anyone had good
> or bad experiences with bringing up the compression? In either case, how
> much was milled off? Note: I'm running a hotter than stock cam.
>
> Thanks in advance-
> PL
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