Closed cooling on fresh water with aluminum heads?
 

After all this time waiting, my new 502 engine build is finally running.

New GM block

Promaxx aluminum heads

BMP aluminum intake manifold (brass lined marine version)

New oil cooler

CMI E top (fusion) exhaust

Boat will be run in only fresh water. And will need to be winterized yearly.

New block, so scale/rust is not an issue. Intake manifold is brass lined, so that's good. I'm wondering about the untreated heads and unlike metals.

Is it worth the cost and hassle to go closed cooling? And if so, would you do half or full?

https://www.cpperformance.com/p-7394...per-brass.aspx

https://www.cpperformance.com/p-7979...per-brass.aspx

To be honest, I really want the serpentine belt conversion (currently have V) and cost of closed cooling is nearly the same.

https://www.cpperformance.com/p-1266...ting-pump.aspx

I’m repetitive here, but CC and Daytona Sensor ignition system are the two best investments I’ve ever made to my boat……

The CP kit fits both std deck and tall deck. I just kept my V-Belt setup - it’s foolproof and easy and those belts last decades…….



https://cimg5.ibsrv.net/gimg/www.off...bf845438f.jpeg

With your cmi stainless steel headers, i would buy the half system. I highly recomend the closed cooling where ever you are boating.

I run EFI (as&m) tall deck chevy 572's w/alum manifolds and haven't learned yet to convert to closed cool ....salt alone has ruined 2 pairs of Imco "power flow plus:" manifolds & risers ...been talkin
for years but no action sorry to say!

cmon Scippy - you would seriously sleep so much better. It honestly feels so good. I’m not exaggerating - I just felt this complete sense of relief once installed.

Probably already winter in NY - pull the trigger and get started….

The full systems are more complex. They need coolant flow though the exh manifolds before thermostat opening.

+extra plumbing.

Fresh water cooling half system would be my go-to for fresh water boating.

Salt water for sure....fresh water spend the coin somewhere else.

if I would've have put aside half the $$$ I spent on beefing up my tow truck which pulls my boat CC would have been done a long time ago...my priorities really suck!...but, this winter or bust!!

I've seen your recommendation for both and have been thinking about them. Did not realize your polished pullies were still Vee belt. I just assumed it was serpentine.

Part of my reason for wanting the serpentine conversion was for the ability to spin a higher output alternator. They recommend a serpentine or a dual vee for 150 amp alternator.

No doubt I would add CC if I were in salt. Went way over budget on the build, but now's the time to install if it's really needed. (new engine)