Tom w. wrote,
>I have been asked for a 8.5 inch pressure plate and I am not sure how to
tell these >apart from the 8.0 inch pressure plates. Both of the pressure
plates I measured >were 8.5 inch in diameter on the clutch surface. I would
think that there should be >some extra space around the clutch and believe
that these are for a 8.0 inch clutch. >Is the diameter of a 8.5 inch
pressure plate 9.0 inch in diameter? Can anyone >explain the differences or
do both 8.0 and 8.5 inch use the same pressure plate?
> Also, I have always looked at the casting date to determine if a head
was a
>1600 or a 1725. Last night I put a 1963 head next to a 1966 head and I
could not >see any external differences. Is there any way to tell besides
measuring the size >of the valves? Also do later (1967??) 1725 heads have
different spark plug holes?
>Confused in Chicago,
>Tom
The Series II and III full sprung clutches will take the 8 1/2 disk.
They are probably designed for it, but rootes decided to use the 8 inch
instead.
Later diaphragm sprung clutches have a 8 inch plate, and cant use the larger
disc.
SV clutches can only use a 7 1/2 disc.
On the heads, you cant tell the difference between a SI and a SV head,
except as was noted by the valve size.
Most Early SV heads will have a cap over the water intake port on the carb
side of the head, while earlier heads will have a connection to the intake
manifold.
And of course later SV heads and "Arrow" 1725 heads look very different
in the spark plug area, and dont fill up with oil.
There is no performance difference between early vs later SV heads
other than the aesthetical aspecs.
jarrid
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