Cooling System

[eightsecmopar]

I'm putting circulating pumps back on my engines and I'm thinking of buying the the low flat style stainless steel t-stat housings from Diamond Performance #18-1989. Does anyone know if you have to run the 3/4" bypass hose from the top of the water pump to the front of the intake? I looked at the Merc parts listings for the 500hp's 540 Bulldog's and some others and it seems like some have them and some don't. Has anyone used this style t-stat housing before and would this be the best one to run or would the stock style Merc one be better? Any help would be appreciated

[MILD THUNDER]

You should be fine with that T-stat housing. You can go either way with that bypass hose. Not really needed. I believe that hose is mainly used in cars, so the coolant can still circulate somewhat without going thru the radiator. I dont see a need for it on a boat. Your bypass would be acheived thru the connection of the circulating pump and that style t-stat housing.

[eightsecmopar]

Thanks, I appreciate the info

[MILD THUNDER]

No Problem. Will you be attending the races again this year?

[eightsecmopar]

Yes, It was a blast last year!