There are a whole bunch of different 1275cc head castings of which I know
very little. Whether or not the casting is A+ doesn'e mean anything as they
made some small valve 1275cc heads for stuff like the Morris Ital. On the
other hand the late A+ heads on the Classic (but not 1960s Classic) Minis
would
have had bigger valves.
What you need to know is what the valve sizes are and how well the casting
is ported. There are different combinations of inlet and exhaust that will
fit in the head.
Any 9 stud block can be drilled and tapped to take the extra 2 studs or
sometimes a stud and a bolt.
All of the 5 port aluminium alloy heads originate from Pierce who supply
them as a bare casting for 'whoever' to build as per the customer spec. There
is almost no data on the Pierce heads and possibly no flow bench data either.
Generally the limitation on the Pierce head appears to be that since it
needs an insert for one of the valves (or both) you can't get use as big
valves
as you can in an iron head. However, the aluminum head is significantly
lighter than an iron head and if this is more important to you that a few more
bhp
(and almost certainly it'll benefit you more than a few more bhp) it's the
hot choice. At least three listers here are runnin a Pierce head - probably
all to different specs.
Weslake-Monza 1330
In a message dated 21/01/2009 21:35:59 GMT Standard Time,
mdrowe@optonline.net writes:
MiniMania offers Longman heads for 11-stud blocks that "will fit 9-stud
blocks." I assume they are A+ heads, but I can't find any information on this
difference. Also, alloy heads claim a different internal shaping that
increases flow by 30% with standard valves. All are expensive. Any advice?
Michael Rowe
'74 Midget
Long Island, NY
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