Hunter, sorry to hear the bad news.

Yes sir. Definitely a rod knock. I believe I caught an ice bag or something similar. I've had it happen once on my drag boat. Know numerous guys have had it happen to them. Normally we can shut down quick enough to just pick the pieces out. I wasn't so lucky this time. I just got off, gonna go home get a shower and go to bed. I wish I had the time and energy to at least get it out. I have spoken to one of the two local race engine builders that are supposed to the best of the best. I'll talk to the other one tomorrow. I'm hoping the crank isn't damaged. If so who knows what I'll end up building out of it.

Haven't even pulled the cover off since I got home with it Saturday but I can't help but make plans. Just talked to Bob Grissom (The original engine builder) his suggestion is to tear it down and see how bad it is. If I need a crank he wants to go ahead and stroke it to a 506. A different camshaft and keep my heads. A little carb work and we should be around 650-675hp. I am afraid would then need a more "performance" enthused exhaust than my thumper powers. But the build cost for this wouldn't be bad at all.

Still hoping I can tear it down and just replace some bearings and have the rotating assembly balanced though. I really liked it the way it was. More power would end up putomg the bravo in more jeopardy.

Got the outdrive off last night. Hopefully tomorrow morning can get engine out

What combination to get to 506? A 4.375 stroke?

Yes, retain the 100 over bore. Stroker crank, rods and obviously shorter pistons with more relief cut. I'll have to ask bob what length the rods are. 4.375 sounds right but if have to ask.

It's out. Gonna take it up to my friends shop one day next week to tear it down and inspect the damage.

Is it already a 100 over? That would give 505ci with a 4.25 crank and 520 with a 4.375. Hopefully the cylinder wall are thick enough

Yes it's 100 over. I'm hoping no wall damage. I hope not to have to do anything but some bearings and gaskets. But we will see. As far as stroke I will consult with bob grissom about that once it's tore down if I end up needing to do anything.

Hopefully its a simple refresh. At least you dont have a 3 month boating season working against you like we do up north.
If you do need a crank, a 4.375 stroke would be cool but im sure it would be cheaper to have yours cut if its a forged piece