. next pump check the bolt size and the pump threads .Oops, I missed your question Dan. Yes, the flange cracked as I was tightening the bolt.
in post #2 (first reply) , why do you think I asked that question .Here's my old M-68 and new one with the cracked flange. You can see how the new pump has less material around that lower bolt hole. Oddly enough though there is more material around the upper bolt hole. Could be the casting hasn't changed, just that they machined the holes off center.
have it your way .The combination of wall thickness around that bolt hole, plus the brittle nature of cast iron are exactly why it cracked. Dan, if you don't like my posts then don't bother replying to them.
you found this!!!!! mean you did thisI found this as I was installing a new Melling M68 oil pump in my 302. That ain't good! I'm not sure I want to use a Melling now. Anybody have a recommendation for a better quality oil pump (standard volume, for small block Ford)?