Peter wrote:
> Anyone on the list have a set of new GT-6 (.020) pistons for sale or
>barter? Before I commit to pistons, would welcome advice about best
>practice...i.e. the block I am rebuilding (bore, line bore, adding
>cam bearings, etc. is, I think, from a Mark 3 (KF XXXX number on
>block)...but on disassembly found flat top pistons, not domed. Vicky
>Brit catalogs suggest that Mark 3 pistons should be domed...course
>they also say that the later models had higher compression than the
>Mark 2s...which other readings suggest is wrong.
KE/KF series blocks were used on both the MKII (GT6 + ) and MKIII. I'd bet
that you have the correct engine or possibly an early MKIII. Check your
#"s:
to KE/KF 10000 = flat top pistons (MKII/early MKIII)
from KE/KF 10001 = domed pistons
>My quandry is that I believe the dome top pistons would give a higher
>compression ratio (all other things being equal) but I am uncertain
>about clearance from the valves after milling the head...am I better
>off to use flat top pistons and get the higher compression by milling
>or is there some performance improvement associated with the shape of
>the dome tops???
Keep it simple - stay with the flat tops! Later GT-6 MKIII's (starting
sometime in
1972) had recessed blocks, a different head, head gasket, and the domed
pistons.
You cannot successfully mix & match components.
I am currently building two full race 1.9 engines - one is a ' 69 and the
other is the
' 71 that was original in my car. Engines are identical. BTW, there have
been some
wild configurations w/specially forged dome pistons for these two marques,
but
would advise against this practice.
>Depending on the responses to these questions, I am in the market for
>a set of pistons...
Well, I am considering selling a set of brand new, in the box AE flat tops
+.030"
Will know this weekend when I get my final quote on the machining work being
done to the aforementioned engines.....
Charlie
racegt6@aol.com
71 GT6 D prod. AKA "le moneypit" :->
74 TR6 AKA "le wife's car" ;-)
SAAB Turbo
|