hello,
from my last post I have a bad cylinder head found a couple on ebay an a junk yard in phoenix also talked to a machine shop to see about magnaflux then get the head welded if it is in a weldable spot. Then i was doing some google searches an found a article about someone breaking off a spark plug in the block an a reply to his post was any year 550 head will work as well as a 500. I have a spare 500 motor so will that match up(work) thanks paul