Iirc there is a plug above the fuel pump boss that if left out won't necessarily leak at idle but shoots oil out pretty bad at higher rpms. Had a drag car motor brought to me for that once a while back.

Contact TxHAWK....he can steer you in the right direction if your in TEXAS

I hate to say this but I did the same thing a couple decades ago. Put a bolt in and that solved the problem. And yes it came out pretty fast.

In your other post you mention someone told you the mechanic is a pill head...........pretty sure i found your problem.

yes

They were not dyno'd on stand just built then back to mechanic and in boat. stock valve covers are still on boat...Two procharged motors but only newly rebuilt one leaks, both superchargers went back to Procharger last year and both were still in perfect shape. They just resealed them and sent back.

That was original mechanic who had my boat a year and barely touched it, i paid a 2700 idiot tax for that.

Not sure if misted but fills up bilge at higher rpms, i can cruise 3500 rpm and we cant see leak but all the oil is in bilge within 10 minutes. its a chore draining out the oil in a bucket from drain plug after each test outing.

OK I left him message...Sorry about all the replies but I was typing with one hand giving a 6 week old a bottle with other.

larry, I must have missed it but what CID are these engines?

Merc 350's, was told they put out 650'ish hp from previous owner.

https://youtu.be/qMnYEV5-Me0