If you had a good one, it was a not-bad engine at all. Once the GM head bolts were replaced with a set of studs, it was then a pretty decent engine. I only had one, never had any grief from it but didn't have it more than a year. Mine was in a C10, and everyone said they were so gutless...so I did a little matchup with my buddy's Wagoneer 360 CID gasser - and the "gutless" C10 walked away - not ran, but DID walk. I have a 6.5 K15 now as a chore truck, but compared with my wife's Q7, it really is gutless by today's standards. BUT: the real advantage is that I can throw just about any hydrocarbon into the fuel tank and it will run just fine.