Just a quick question, Will any magna head bolt onto another? I have a few hear ranging between M1And M7. Will a M4 Carby head bolt on to a TR with a M7 Head? (M4 was carby and M7 fuel inj)

all the tn to ts heads will bolt up. as for carby and efi , they are the same head.

Thanks for that.
Will they all work on lpg? and what are the diffrences between the heads?

there should be no problem. if your got the cash get gas vavles fitted.