<VV> RE: White pushrod tubes

[JVHRoberts at aol.com]

Actually, a MUCH better way would be to take a very thin piece of stainless 
steel shim stock, and make a heat shield adjacent to the exhaust tube, tack 
welded to the pushrod tube. Something simple, half round, tacked in two places, 
with even the bare minimum of an air gap will provide FAR better heat 
protection than any coating. 

John


In a message dated 2/4/2005 6:12:18 PM Eastern Standard Time, 
mhicks130@cox.net writes:
I would think there is a significant amount of radiant heat from the very hot 
cylinder heads that are pretty close to the tubes.  I would agree that the 
main source of heat to the tubes (especially near the outer o-ring) is 
conductive heat transfer from the heads.  Unless the tubes only contact the heads THRU 
the o-rings (no metal-to-metal contact) - if that were true then I think the 
main source of heat transfer to the tubes might be the radiant heat from the 
head. (The o-rings would act like insulators).

Finch recommended painting the outer half of the tubes (near the heads) white 
and not the inner part (near the block)(at least in my old version of his 
book).  The block (metal) would be relatively cool compared to the cylinder head 
(metal). The oil temp probably averages out since it's always on the move.

mike