They are interchangeable as the cam journal sizes are the same. A quick
check of my old sprite books shows that the stock 1275 has the same grind as
the
stock 948 so that shouldn't change the performance or tuning settings. The
differences are that the 948 has 3/8" wide lobes while the 1275 has 1/2" (a
good thing). And, if memory serves, the 1275 doesn't have a lobe to drive
the 948 fuel pump. That can be solved by fitting an electric pump if not
already upgraded. And, as Frank says, you will have to match the oil pump
drive,
or get a new pump or adapter if it doesn't.
Chris Gross
Vintage Bugeye racer
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