gpz1100 and j head ?

#1 ok guys i did search on the forum. from what i gather the j head and the gpz head(-the 81) are the same- as for mounting them on a kz bottom end.

#2 the diffence between the the j head and the gpz11 head is valve size? any thing else?

#3 can you fix the compression by going with mtc/wiseco high compression pistons?

#4 what is the compression if you go with stock(gpz) pistons and a spacer block?
thanks scott

Scott...here is a good primer for starters...

www.aperaceparts.com/tech/techkz1000.html

dont forget the gpz1100 was fuel injected so it has inlets for the injectors in the head but its easy to tap a hex bolt in there or some ppl fab a little blank plate.

wg told me a couple of days ago
"The stock compression on all my bikes is about 8.75"

hope this helps