www.Alkydigger.com for any help with Hilborn, Algon, Enderle, Vertex Magnetos, We stock almost everything Hilborn and Enderle makes, as well as a huge Blower and drive systems inventory from BDS, The Blower Shop, and Dyer 615-457-3192
When you get to about 10% under drive with a 6-71 , you should highly consider double keyway At 1-1 you should double key for sure At 10% over with a 6-71 , you are ok with a double keyway, but with a 8-71 you should consider two things : A Crankshaft support , and/or a Big Block Snout on your crank. At anything higher than 15% over with a 6-71 and 10% over with a 8-71 all small blocks should be equipped with a crankshaft support. At 20% over with a 8-71 , 10-71 14-71 all Big Blocks should consider a Crankshaft support. * Why ? - From the minute a blower begins to turn, it pulls the crankshaft up against the top main bearing- the more the boost or speed , the worse it gets. On a small block, you can snap the snout off the crank, on a big block, you will eventually beat the top main bearing out of the block- More speed,,,,, more of a problem. The Crankshaft support acts like a 6th main bearing out in front of #1 main bearing, causing the crankshaft to be supported as if it is in a cradle . We sell crank supports for Big Block and Small block Chevies, and we are about to introduce our LS Chevy support next month.
The Jalopy Journal
