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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2005 Posts: 86 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 86 | Hi All,
I finished putting a Mercruiser 165hp inboard motor in Ol Green, my 66 C20! It all came out surprising well. It did not have many hours on it. I put a new head gasket on it leaving the rest of the long block as-is and then I put all the components off my old 250 on it. The old motor had a bent snout on the front of the crank creating an annoying vibration.
The boat motor runs very smooth and revs nicely! Has anyone else out there done this swap?
JC in KC
"The future will be better tomorrow." Dan Quayle
1965 Chevy C10 Long Fleetside
| | | | | Joined: Sep 2007 Posts: 30 New Guy | | New Guy Joined: Sep 2007 Posts: 30 | is there any major difference in the marine motors and a std 250? | | | | | Joined: Mar 2005 Posts: 86 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 86 | As far as the longblock goes, I think the cam is setup for higher rpms. On the casting of the block, I am not noticing anything obviously different.
JC in KC
"The future will be better tomorrow." Dan Quayle
1965 Chevy C10 Long Fleetside
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