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Nice horns, speedfreak. I found a 35 power head. I measured the ports. The transfers and fingers are the same on both motors. The exhaust is 0.070” higher on the 35hp.

I have been working on the lower unit. Here are some pics.
I blocked off the exhaust passage at the cav plate. Now the exhaust will exit above the cav plate instead of through the hub. I used some...

I will be blocking off the stock water pickup in the lower unit and adding holes at the front as I have done on my two cylinder. 72508
Or I may block off the back of the carrier and have water inlet...

I am making some modifications to the lower unit as well. I may have the exhaust exit above the cavitation plate as I have done on a two cylinder motor.
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I will also be blocking off the stock...

I have pulled the sleeves out of the block to make it easier to massage the ports. The glue lines from the lost foam process, obstruct the flow as nerstrom pointed out in another thread. I will...

Got the midsection welded and ground today. I am not going to use the stock lower cowl, so I ground off a lot of extra material.
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No it’s not an etec. It is a 1996-2001 evinrude 25hp 3 cylinder.

That’s great information, thank you. I am concerned about what the reduction in volume will do to the exhaust tuning. I have not...

I know there are already some threads on here about modifying 20-35hp outboards. Just thought I would start a new one.

Here are some pics of a Johnson/Evinrude 3 cylinder 25/35hp I am modifying....