1. I used Victor reinz last time, no leaks that I've noticed. It's just a flat mating surface, so just make sure its clean and dry, I used a little RTV too.
2. I couldn't find the specs either, but just made them snug and made sure they were all decently tight by going around and across multiple times.
3. Don't know the answer for that one.
4. I'm not sure why its so wide, but I put a new o ring on it and took up the extra space with a little gob of RTV on each side of the o ring. I used the black permatex... It's supposed to be oil resistant and I have had good results. I doubt that area gets that hot. Maybe 225 F at most. It's away from all the exhaust stuff and on the outside of the block. Just my opinion... I haven't taken an IR gun to it or anything haha
Spenser
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