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Marine Water Pump Info- A BIG FYI

JimR

Charter Member
If you own a 4.3, 305 or 350 marine engine this will be of value to you. Seirra makes a replacement water pump for the original that is $100.00 cheaper than a marine pump from your local boat dealer. My local dealer wanted $124.95 for a water pump for my 260/350 Mercruiser/Chevy engine. This motor has a plastic timing cover which requires a different pump than the normal steel timing cover engine. After spending a good hour with a few different auto parts stores. We were able to cross over the Mercruiser number to a Seirra pump. I just picked the pump up and it is in fact a marine water pump. The cost was $24.95. It has a stainless steel back cover, brass fittings and brass impeller just like the original. The brass items were not a concern of mine since I am in the process of converting my motor over to a closed system with antifreeze and just wanted a normal water pump that was the same height and would fit over the plastic timing cover. Hopefully this info can save someone a lot of money down the road. I bought it through Advanced Auto Parts. The Seirra number is 18-3599. To top off my good luck I felt lucky today and bought one lottery ticket. I just won $2000.00 on a $2.00 ticket. I see a 6000 pound boat trailer in the near future for the Formula I just bought.
 
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