More than one way to skin a cat, or a knuckle. Pontiac headers aren't that tuff just patience and some basic mechanical skills. Most leaks on headers are due to poorly made headers, in the area of where the tubes are welded to the flange. You can grind, file the weld flush with the flange and braze on the tube side to add some extra material if needed. It is a lot of work but you won't need to put goop all over the place to get them to seal if you do this first before you try to install them. Install the engine then remove to bolt on the motor mount on one side then jack up that side of the motor this will give you additional room to slide the header in from the bottom and make it easier to install the bolts to the head. After one side is done lower the engine put the motor mount bolt in and repeat on the other side. Of course you will leave the trans just sitting on the mount without bolting it up so you can jack the engine side to side.
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Tim Corcoran
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