if your nervous about the condition of the motor do a leak down test on it. this will tell you a percentage of leak down in a cylinder, whether the rings are shot or if it needs a valve job.

I don't think I would buy a motor without this being done

135 hours on mine as of sunday, only maintence so far is thermastat. I do baby it though mobl 1 syn, changed every 20 hours. While you are changing out motors, ADD A OIL DRAIN KIT, before you put it in the boat. Make life easier in long run.

I currently have a 300 hp carbed 454 in my baja 232 and looking to upgrade to atleast 425 - 500 hp. If you guys dont mind, what are these HP500's going for ??. Anyone know a good deal one ??. I would need a carbed one ofcourse...

Checkmate,

It is my understanding that the carb 500hp's had the valve spring issues, not the efi's. I have carb 500 hp's with 560 hours and the only thing done was valve springs,lifters, and cams at 200 hours. I use my boat about 75 to 100 hours a year and run it pretty hard. They still seem to make good power and burn very little oil. (about a quart every 50 hours).

Dan

Thanks again for the information.

Chris32:

Contact JohnB above, he has a HP500 carb that was just freshened that he is looking to sell.

Chris,
HP 500 I have for sale has the Mercury new type valve springs. Let me know if you need more information or pictures.
JB

I was looking into a 1800runsnew 454HO 425hp, as a direct bolt in...

John, what does the motor come with as far as accessories, ?? Can I take anything needed off my old motor ?? what would I have to buy ?, and of course, how much are you looking to get for the motor.. Thanks Chris

Chris, check for private message.