Best gaskets for a Merc 325

[donwhiteside]

Hi- I'm pulling the heads on my 1973 Mercruiser 325 (it is a GM big block 427 engine). The engine is in a 1973 Cruise-a-Home houseboat, attached to a Mercruiser III I/O. The head gaskets are leaking (but not into the oil yet), and it will be an opportunity to clean things up. I will be doing the labor myself, which I'm capable of and comfortable doing.

I've heard that a huge difference in how marine engines hold up has to do with the gaskets that engine builders use. I'd like to put the best ones I can in this. Suggetions of type, and where to buy would be appreciated.

At a minimum, I'll replace head, intake, exhaust/riser, water pump, etc. gaskets.

Thanks all!

Don

 

[whywhyzed]

Re: Best gaskets for a Merc 325

I've heard that a huge difference in how marine engines hold up has to do with the gaskets that engine builders use.

I like fel-Pro, but I would put conscienscious work (tightening everything properly and cleanliness) way ahead of gasket brand in that analogy.

Fresh water or salt water? open cooling or heat exchanger?

What led to the diagnosis that the head gaskets have a problem?

If it's water in the oil, you have a lot of other things to check.

 

[donwhiteside]

Re: Best gaskets for a Merc 325

There is visable water leaking at the seam between the block and head, on the starbord side. Engine is in fresh water, raw water cooled. Again, the oil is clear (no water in it).

Thanks,

Don