We have a 1988 8650 with a locked up engine. 12000 hours. My question is...does anyone make an adapter plate anymore from JD big block to Detroit, Cummins, Cat, etc...or even to SAE? Ive given up trying to find a reasonably priced used engine for this. Ive found a couple, but 10 grand for an engine with unknown hours is not what I consider within reason. Ive never been a fan of the 619 in an 86 anyway...just so torqueless it barely can drag around its own weight. I called the guys in New York that make frame kits for these tractors, they didnt sound like they wanted to do any for 86s anymore and that route is fairly pricey anyway. My thoughts are trying to adapt an 8v71 into this tractor...and do some bracing and reinforcing on the silly frame that it already has. 8vs are very rugged blocks and can take a very high amount of abuse as is. Any help would be appreciated and no, im not going to waste 1 penny rebuilding that torqueless pile of an engine