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Got it back in the car and put back together, in 30 degree weather no less. Just used cheap oil with about half quart of Marvel mystery oil and filled the coolant up checking it several times until it no longer dropped. Quite a bit of ticking to start but quieted down after a few mins. And for the first time in a couple years, no noticeable oil leak from it which is great. Let it idle for a while keeping an eye on the temp gauge and ran right where it always has. Made a short trip to make sure everything was good and performed very well. Thanks again everyone for the helpful tips along the way. I will only be changing out the intake gaskets for OEM in the near future but otherwise finished.

H6s occasionally have 6 misfires caused by carbon deposits/fouling of the intakes/heads.

I ordered the subaru gaskets, part #14035AA150 that superseded original part#14035AA000. Should be here next week.

This starts the question ...will an EA82 EFI fuel tank fit to EA81 body in order to get tank internal baffling? Or possible to find a turbo brat fuel tank? If it is baffled for EFI turbo would make life easier If the DR 5 sp is out of a carb donor the axle stubs should be 23 spline so allows you to use standard 4 WD EA81 shafts. MPFI manual boxes have 25 splines if you have this, ask more questions The EA82 box conversion is easy to do, Easy to walk you through it. I have done three. Never finished an EJ conversion

ok, trusted mech verdict after a test drive is bearing or bearings gone on the input shaft, quoted two full days of work to drop trans out, open it and put back together + parts ( can vary) and i could be spending a nice 800 -1K add to this a kit clutch which at this point would be stupid not to do while trns is out and it swells even more. think im going to give this 250$ trans a chance and try to DIY it.

Those are all reliable components. The reliability will be most effected by the build itself. In this project, you will be removing almost every mechanical component in the car...so it'll be on you to make it reliable. The biggest thing will be the engine wiring, make sure it's clean, all connections are moisture and vibration-proof (I use only Molex Perma-seal butt splices), that nothing can chafe. You will also have to replumb the fuel system, so again, make sure it's done right, and you're not going to have problems down the road. Do not assume it'll be a completely reliable car right out of the gate. Don't take it on a road trip a week after getting it running. Issues will present themselves, you will have to limp it home, maybe towed. If the 81 has A/C, it'll just be a matter of making custom lines to plumb the EJ22 compressor into the EA81 system. If not, you'll have to retrofit an evaporator and stuff into it.....I don't know. Easiest is to just use the EA81 crossmember, front suspension, and axles. You could build your lift blocks to adapt the wider EA82 crossmember onto it, and then use those components, but IMHO that's more work than it's worth for a lifted build. I don't find the EA81 manual rack to be a problem with big tires. I have 29" tires on my Brat, and it seems to work well (not street worthy, don't think I've ever had it over 15mph). I had an EA82 with 29" tires that had a power steering rack that someone had deleted the pump, that was annoying. This would be the only reason to use the EA82 crossmember, as getting an EA81 power steering rack is very difficult. EA81 fuel tank doesn't have the same baffling as a fuel injection tank would. So you'll probably have occasional fuel starve when the tank gets low and starts sloshing around. The correct fix is to add a surge tank, but I just would fill up a bit sooner. There are a couple hurtles of using the EA82 5-speed transmission in the EA81 body. Custom/modified crossmember and driveshaft, IIRC. I haven't done it, but it's been discussed here many many times.

My father, the one who purchased brand new this Mercury Comet Coupé in 1969, and I, were about to do a little travel on it, for its Fifty Years Anniversary, and we just obtained brand new 20W~50 Valvoline's "MaxLife" motor oil, brand new oil Filter and a brand new electronic Fuel Pump, as the old one (also electronic, as I changed it two decades ago), started to fail due to low usage rate... when my Father suddenly passed away; he was 74 years old, he wasn't ill nor suffered from any illness, he went driving to a place, where suddenly got a fulminant heart attack. My Family and I feel very, very sad and the emptyness we feel couldn't be described with words. He thaught me how to do basic maintenance on Cars, in this Mercury, when I was a little child; I learned how to change a fuel filter, how to change motor oil, sparkplugs, radiator coolant, etc... and to be with him, learning and doing lot of things, always felt amazing, to the point that a repair felt very exiting. I learned many, many things from my Father, such like Honesty, to be sincer, to be kind, to treat everyone in the way I would like to be treated; to work hard... in fact I started to work at the age of Ten years old, alongside with him, and now I'll continue, like him, until God call me. My beloved coupé will run again, but without him, feels very empty. Kind Regards.

By the Way, this thread's title must read now "Fifty (50) Years" instead of fourty Kind Regards.