In a message dated 97-06-14 15:14:49 EDT, SEALMSTR(at)ICCOM.COM (CHUCK
NICODEMUS) writes:
>
>I have removed the head +( now have(bimetal) corrosion on the back hole
>both on the head and the block,,? the head has a marking of 035,looks
>like some one hand punched those no's in on the edge. also i need to
>know the valve throw or travel. if the removal of more material will
>allow me to just set the head with the new gasket kit or do i need an
>over sized head gasket??. the engine has been redone as the pistons are
>marked +40. it does' run strong and if i grind the head and mill the
>block will i have the room for the valves ,, I guess that was my
>original thought..
Milling the head will increase your compression ratio, so be prepared to
retard your timing or start investing in premium fuel. There are two cast
semi-circle depressions on the face of the head that can indicate how much
material has been milled in the past (and is available in the future), but
someone else would have to tell you how "deep" they are when stock to give
you a starting point. I haven't heard of anyone having valve clearance
problems before, regardless of head milling. If the head is milled enough,
you'll have to elongate the top row of holes in the side chamber cover.
Anyone out there know how much you can mill a block? Very little, I suspect.
BTW, you mentioned the "back hole" having corrosion. How about the center
water restrictor? Usually that's the first area to corrode.
Dick Sanders
Seattle,WA
P.S. Hey, Chuck! Are we going to see you at the Portland Historic Races in
July?
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