[bbbentley]

Just an idea Sam, find some cheap, unhardened, 3 in. or close length hex head bolts the same size thread as the header (3/8-16? Or 5/16 can’t remember) you only need 2 per side. Most bb Chev s are just tight enough that the engine needs to be raised off the mounts whether put in from top or bottom. I have only installed from the bottom. You need to do this on a lift as the header has to be tilted down and angled up into position. I would 1st unbolt eng. mounts. Raise engine and put a block of 2X4 under each mount. Once header is in position, put one of your long bolts in a hole near the front of header and one in one of the rear end (just find an easy hole to start bolt) leave both finger tight. You are just wanting to have the headers positioned. Now, you are ready to remove blocks and lower engine back down in position. At this point the header is not bolted up rigid, so there is some give to move enough to get bolt eng. mount bolts started. Now, try to put the motor mount bolt in the easiest way 1st. This way you can be assured it will go in the hard way and everything will line up. The way I adjust the engine up and down to align holes of frame stand with mount, I find that a bottle jack positioned directly under a oil pan bolt on the same side as the side that bolt is started gives the most control of incremental movement to align holes. A bottle cap off a plastic water bottle can be placed between oil pan bolt and jack to prevent marring. Once engine is signed & bolted back in stands, you can move to the top side and start your regular header bolts, eventually removing the 2 Long alignment bolts.