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- Nov 26, 2009
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I did some testing comparing Yambond, silicone and other sealers. The best by far was “the right stuff” (Permatex #25229 or 25223). I even used it around the pushrod tunnels with a copper head gasket (also on a .003" thin copper headgasket ring). The right stuff is good to 500 degrees F. Everything else developed a leak except the right stuff (with a bit of 30 weight silk thread for insurance at the pushrod tunnels).
Silicone worms its way out
Yamabond can't take cylinder head heat very well.
Loctite 518 worms out at the bottom of the cylinders and burns up on the head near the exhaust ports.
But Loctite 518 works fine on the vertical case split and Yamabond works fine at the bottom of the cylinders.
See my next post below for dealing with the "right stuff" applicator.
Silicone worms its way out
Yamabond can't take cylinder head heat very well.
Loctite 518 worms out at the bottom of the cylinders and burns up on the head near the exhaust ports.
But Loctite 518 works fine on the vertical case split and Yamabond works fine at the bottom of the cylinders.
See my next post below for dealing with the "right stuff" applicator.