[QUOTE]Originally posted by Bleyseng:
[B]I think it's a combination of all three things here. I think you need to flat file the heat exchangers so they seat onto the copper gaskets properly. Try what John said, look to make sure you haven't run out of threads when you tighten the exhaust manifold studs. Lastly, tighten the nuts down to spec. This is done slowly so the manifolds seat into the heads right. It's a tight fit and you need to pull the exchangers evenly against the copper gaskets.They do bind against the heads giving you the impression that they are in. I even rap them with a rubber mallet to make sure they are in all the way. It makes a "solid" sound when they are in. Once they are seated, tighten to spec or very snug and no more leaks.
I like to fit the copper gaskets into the heads with copper rtv ( a small amount). That way I know they are fit into the heads just right. Then I install the exchangers after a quick flat file.
Geoff
PS I looked the torque spec's up, it's 15ftlbs.
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