Yes it is just the top 2 valve cover bolts that need the sealer, but its on stock unported 72cc O-port heads too, at least the non CNC 72cc, others may be different. Mine are unported and the top 2 bolt holes are open. I use thread sealer on the top 2 bolts but have read of others using studs on them with loctite to seal and keep in place.
I have seen the end of the heat core inlet tube crimped down on aftermarket ones, but wasnt the factory head outlet fitting designed with a restriction to limit flow too? I couldnt find anything like that for the E-heads threaded hole so I went with a curved AN fitting, think it was a -10 or -12.
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