Seven Marine Outboard Engines

1. The Seven Marine outboards were based on the GM Cadillac Northstar engine. Parts availability for the block and peripheral engine equipment in the future should be good. The mid-section and lower unit were proprietary to Seven and may prove more difficult to source.

2. Automotive blocks in high RPM marine applications live a notoriously troubled life.

3. If you can find parts, can you find someone to work on them? Seven Marine didn’t have a well established dealer network.

What kind of yacht is powered by outboards?

If you can’t find a local shop that can work on them, make sure the price allows for a repower when the need arises.

...

Mercury 600 do it better and are a production engine.

HCB used Seven Marine. As I recall their 65’ had a half million dollars of them bolted to the transom.

If you're in South Florida there is a tech named Alex Nomer who's company is called Seven Ocean Services and is based out of Palm Beach Yacht Center; he would be a great person to reach out to. He is one of the Seven Marine factory certified mechanics and still services a lot of boats with Seven Marine outboards. He is an incredible mechanic and overall a great person to know in the marine industry.

Thanks

A dock mate had a HCB 65 powered with 7's two years ago. Located in Delray. They were out of warranty but he was notified that all his would be re-built (top end sea water issue) and 2 year warranty issued. All worked out ok.

Here's a good knowledgeable article from Boating Magazine. Describing the build process.

https://www.boatingmag.com/building-seven-marine-outboard/

That's the right approach, unfortunately the original owners are now faced with owning a white elephant and they are in the same position as a new buyer would be.

Market price - full OB repower = new street price.