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I'm the one with the failing manifold gaskets... I did the job yesterday morning in about an hour and it greatly improved the situation. It now runs strong!! I've had the problem before with another B20, but FI. If even one stud is busted, it will probably leak somewhere. I was dreading the prosp[ect of broken studs, so I bought a set of nine beforehand. The old ones weren't too difficult to get out (use a lot of B'laster or similar penetrating oil). I had to take the vise grips to a few of them and slowly eek them out, but it all worked well. Replacing the studs is a good idea and the use of anti-seize compound is recommended to assist in future removal. This problem seems to be prevalent in most of these engines. After you put it back together, drive it around then park it and let the engine cool for about an hour and re-torque the bolts. If the inlet and outlet manifold thicknesses are dissimilar (like when using a Canon intake with Webers), use trimmed washers to make the surfaces flush to prevent bent studs and pain and suffering. It's not that intimidating once you've done it five times (my 72 FI 145 had a broken stud I never replaced, but kept putting new gaskets on. DUMB!!! It's not that difficult to extract a busted stud with an easy-out screw extractor).
Cheers!
Ben
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