ma61

I have them up for bids on ebay https://www.ebay.co.uk/itm/123167531155?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649

Firstly i must apologize if a thread of this nature already exist, but i am having issues finding information on the topic. As the title says I have intentions of mating a 1JZ GTE head with a GE block. I am trying to find a thread but can anyone tell me is there any main differences that...