I'm at a crossroads with my family's 75 Wriedt Maverick 18' jet boat. It's been in our family since day 1 when my Dad bought it off the lot in Norwalk, CA. The jet was rebuilt about 15 years ago, but the engine is '75 original. It still runs but blows a lot of oil out of the breathers and has water in the oil. Thinking the engine was shot, I picked up a complete, running 460 from a former jet boat owner that cut up the hull and saved the engine.
As I've done a little research on the 460, I've come to see there are some common problems that lead to water in the oil. I've also realized there are different generation 460 blocks, heads etc. My original engine has D3VE-A2A heads, D1VE-6015-A2 block, & D0OE 9425 C intake manifold. Internal parts unknown...whatever would've been '75 vintage original. The other complete 460 engine I bought has D2VE-AA heads, D9TE-AB block, & D0VE 9425 B intake. What I found is that the balance is different(internal vs. external) between the two blocks. Also the heads are different...think I read the D2VE heads are "open chamber?" Correct me if I'm wrong.
Which 460 would you run? Am I better off just dropping the complete, running engine in(D9TE block) or am I better off keeping the older gen engine and finding the source of the water leak?
I ran a compression test on both engines....the D9TE block, D2VE heads engine has all cylinders around 100 psi. The D1VE block, D3VE heads engine has around 120 psi in all cylinders. In this engine 3 of the cylinders leak cranking pressure as soon as you let off the starter. That makes me think bad head gasket, which could be the source of the oil/water milkshake too, correct? I realize with how old this engine is, I could also be dealing with a cracked block, broken internals, etc.
I'd like to keep this boat up and running as it has history with my family, I grew up at Paradise Point in this boat, but I can't dump a bunch of $$ into an engine that would cost more than the whole boat.
Anyone have an opinion on which engine to work with? Is the D9TE block, later engine with lower compression not a good choice? Thank you in advance.