Tahoe540
Well-Known Member
- Joined
- Aug 2, 2016
- Messages
- 355
- Reaction score
- 477
I have a 555 that I took out of my offshore boat last year to put in my jet boat this year. The motor was a 548 and I had to have it bored to 4.560 and found out the block has 3 sleeves. Those sleeves were replaced. I had a problem last summer with the motor getting a pretty bad milkshake each of the 3 times I took it out. I had the heads magnafluxed and pressurized and they came back no issues. These were iron 088 heads and had offshore cooling so it was not over pressurizing.. I could see no issues with the head gaskets or the intake gaskets leaking each rebuild . I pretty much rebuilt the whole motor each time. So 3 times last year the gaskets always looked perfect with no visible leaks, and I always inspected the bottom of the sleeves and never found any issues or signs of water. I ended up buying a set of Brodix BB2 heads and Iinstalled them. I drove the offshore boat about 1.5 hours and it seemed to be fine. So after a new rail kit this motor was installed. I had my boat on the hose fully opened a few times to get all the kinks ironed out. Well after doing some reading my boat did not have a gate valve. just the T to put a hose on. I had no issues for the 2 summers I drove it with the stock 454 this way. My first time out with this new motor it was blowing oil everywhere and was seriously milked. Would the hose be too much pressure and push water in but the head gaskets and the intake gaskets look perfect. It seemed like it was milked before went to the lake. I drove it 3 minutes. I use Felpro Gaskets with the blue sealing outlines and you can see on the block and the heads there are no leaks. those seals are not broken. I am starting to think maybe I have a cracked block? I do have a gate valve installed now. I am thinking it is the block. Maybe has a crack or one of the sleeves is leaking and I could never tell?