I agree with 'the trustee'; i've heard about and have known people who had an 1855 blow. My brother in law had a 1955 that never gave a dime's worth of engine trouble, but the 1955 had a heat exchanger (or oil cooler), and the 1855's (at least the early ones) didn't. I've been told that the later 1855's did (have the oil cooler), and they were ok. One neighbor had one blow, and they put a Perkins in it. I believe it was out of a White tractor though - maybe a 2-105. The best I remember, they had to change the tub to accomodate the Perkins.