Gerard, The pocket has to go in the block and not the piston as the
valves in the 1275 head will hit the block without the pocket. Also you
must use the 1275 head gasket.
Crash
You can put a 1275 head on a 1098, but I believe it
requires some pocketing of the pistons for valve clearance. A 1098
head, typically a 12G295 has 1-7/32" intakes and 1" exhaust. A 1275
head is 1-5/16" or 1.4" intakes and 1-5/32" exhaust. Chamber size is
quite different with 28.3cc on a 1098 and 21.4cc on a 1275.
I don't think there is any difference between end plate gaskets,
though the back might be slightly different for the oil pump opening.
Gerard
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