Having too low oiltemp in my bbc's. Thinking of installing Mocal oil thermostat, 203deg, sandwich type. (to be mounted at remote oil filter).

Anyone with experience?

i installed a HP500 one last year and like it, mounts and right rear head and filter goes on it, very clean and simple, merc runs it al the way up to 700sc. i has such low oil temp begining of season that i would milk the oil, now its mint. ther is one on ebay now, they fetch big money but worth it.

I use the Mocal mounted to the block, a bit of a PITA to get at the filter but you will eliminate a LOT of fittings and hose. Add up the fittings and hose length you won't have by keeping it on the block.

Operation wise it is great, oil temp gauge comes right up to about 180 in the pan and stays there until you push it hard. Without the stat it is just a guessing game if you are going to get enough temp.

Hmmm.... I already have the remote oil filter. That's why I'm thinking of these two options:

1. Mocal sandwich type, at filter. This will ad a minimum of fittings (2) but some hose lengts (two more hoses from filter to oilcooler). This means oil will go first from block (pump) up to the filter/tstat, then back down to the oilcooler, then back up to the tstat, then down to block. This means about 7 foot of hose for the oil to travel.

2. Perma-cool tstat, block mounted. This will ad 4 fittings, but results in about 4 foot of hose for the oil to travel. I also have to find somewhere to bolt the tstat.

(As long as oil is cold, there is no difference in oil travel length)
The Perma cool solution is the cheaper one, but will take some more time to install. Any comments/advice from a technical aspect?