On Sat, 14 Jun 1997 12:12:22 -0700 CHUCK NICODEMUS <SEALMSTR(at)ICCOM.COM>
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..
>
>thanks chuck
>series ll
>B9119821
Dont know what the 035 means on the head, but the +40 means that you have
no where to go for overbore as far as OEM pistons are concerned.
Fear not, larger pistons can be made, and will fit inside the OEM head
gaskets.
Many people mill the ^&%# out of the alpine heads, with reasonable
results.
As it was said before, an engine with a tire bottom end, will not
tolerate the
higher compression ratios.
I believe that the stock SII-IV heads run with a head chamber volume of
around
34ccs.
I have a SII head that was milled "by DPO" down to the helicoil inserts.
This is
definately as far as you can go, but I do have to say that that 1600 had
some
balls.
It measures now at 28 ccs.
The combustion chambers can be opened to compensate, which is what Holbay
does to drop the 11.3/1 compression ratio down to a more usable 9.6/1.
The head if properly machined, will flow better as well.
I have done an extensive amount of work in calculating the various
combustion
chamber volumes for performance analysys, and have all the data
available.
Jarrid Gross
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