Hs50 head swap questions

[kayde]

Im thinking on swapping a hs40 head onto a hs50 motor i have installed on my scrambler.
Even though it already runs great aren't we always looking for more.

Before pulling anything apart i figured i should ask.

Does this work?

Does the 40 head have a smaller chamber than the 50?

Will it increase the compression?

If this swap works
which head gasket should be used?

 

[markus]

late 1969-up HS40 have the same head that they used on the HS50 (production began in 1972) so there will be nothing gained.

 

[cfh]

Why do the HS40 and HS50 head gaskets have different part numbers?
HS40 head gasket: #33015
HS50 head gasket: #36443

 

[markus]

Why do the HS40 and HS50 head gaskets have different part numbers?
HS40 head gasket: #33015
HS50 head gasket: #36443

The 40 and 50 have different sized pistons, the internal cut of the gasket around the cylinder bore differs