Callies Magnum Crankshaft - SB Chevy - 3.750" Stroke - 2.100" Pin - 350 Main 2.448" Control Arm Shims 1-1/2-12 in Thread

1-1/2-12 in Thread

Alodined Aluminum

1987-1987 Pontiac Firebird

Hex-head and 12-point types are available

This Throttle Body Includes New OEM Electronics

Callies Magnum Crankshaft - SB Chevy - 3.750" Stroke - 2.100" Pin - 350 Main 2.448" Control Arm Shims 1-1/2-12 in ThreadA combined effort by Callies CNC programming and engineering staffs has resulted in a component that is distinctive and highly functional. Unique counterweight and rod arm contours produce a lightweight, aero efficient crankshaft. Callies Series II Mangnum Mass Correct counterweights have been placed specifically to reduce bearing loads. By concentrating mass at the point of imbalance, the transfer of rotating and reciprocating assembly weight loads