If you have access to a lathe, the pushrods can be made. I made a few on
my E225.
One thing to remember is that the rocker arms typically are not 50/50,
so getting a 0.020 longer pushrod does not change the clearance by
0.020, it may be more.
If you measure all the clearances, quite often you can mix and match to
get in spec with all pushrods.

Dave




Orval Fairbairn wrote:
In article ,
" jls" wrote:


This must be an obscure area because googling it didn't bring up anything in
usenet. Be that as it may the O-300 we are presently doing a top on has
more than .110" dry valve clearance under the rocker toe on several of the
valves. That reading is the clearance between the rocker arm toe and the
top of the valve stem when the hydraulic lifter has been completely
collapsed.

However, the hydraulic units are Superior's, and so are the cylinders. So
I'm wondering if we are going to have to go to longer pushrods, since the
Continental Overhaul Manual calls for limits of .030" to .110" dry valve
clearance. Anybody here got any ideas? What I'm hoping (probably in
futility) is that the limits are greater with Superior hydraulic units. If
not we'll have to go to the next oversize set of pushrods and our budget is
already busted all to hell. TIA and bless you.





Nope -- the dry valve limits affect valve opening and wear. It sounds as
if you need longer pushrods.