I will be needing a external oil thermostat to feed my front mounted cooler for my 3.0 /6 conversion. I know about Mocal and I think they are good price and quality but I'm wondering what you guys are useing? Will need one with -12 AN fittings.

I use a Troutman but they are NLA I hear.

Mocal. Call BAT

http://www.batinc.net/thermos.htm

MOCAL has worked great for me. Just be careful with the AN fittings, the aluminum is soft and could be stripped by ham-fisted overtightening!

Pretty good thread here on +/- of each t-stat and whether to even have one. Too bad Troutman's not available. It's good to have options. Looks like I'll be getting a Mocal.

Not to bad 116 bucks for the mocal. The factory unit from elephant is 325

http://www.elephantracing.com/oilhandling/...4thermostat.htm

The Troutman was priced about half way between the Mocal & the factory unit and had the bypass feature.
To the best of my knowledge, those were your choices.

Would it be worth it to try to find a used factory unit from an S or an SC?

Sure, but getting an old used one disconnected from the lines without boogering them up is a challenge, I hear. Dissimilar metals are the problem as I understand it. No personal experience.

+1 on Mocal, good quality fair price...