Mag drive moves the magneto forward out by the cylinder head making it easy to adjust ignition timing. Housing is made from billet aluminum that is black anodized and uses precision bearings and a toothed sprockets with a rubber Gates belt to insure accurate timing. The drive shaft is made from heat treated steel and is broached 5/16" female so it can drive the oil pump. Bronze distributor drive gear works with most aftermarket camshafts.
Fits 429, 460 and most other aftermarket big block Ford engines.