Add dual keyways for Supercharged or Extreme Duty Applications. Requires double keyed crankshaft snout.
Blower Hub Option - Add $25.00
The super duty hub has increased material for supercharged applications.This increased material helps to protect the hub from cracking in high load applications. The super duty hub is recommended for supercharged applications making over 750 rwhp. Includes matching timing cover oil seal.
Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.