Callies Apex Series Crankshaft - 4.000 in Stroke - Internal Balance - 58X Reluctor - Forged - 1-Piece Seal - GM LS-Series DMI4.12MODPKG3 The result is a suit

The result is a suit that is 26% lighter* than our previous offering

1964-66 GTO

Designed to Resist Large Variations of Coolant Pressure at High RPM

Be sure to check out all our products from System 1 like In-Line Fuel Filters

Callies Apex Series Crankshaft - 4.000 in Stroke - Internal Balance - 58X Reluctor - Forged - 1-Piece Seal - GM LS-Series DMI4.12MODPKG3 The result is a suitProduct Description: Crankshaft Apex Series 4. 000 in Stroke Internal Balance 58X Reluctor Forged Steel 1 Piece Seal GM LS Series Sold Individually Callies Performance Products began manufacturing high performance crankshafts in 1989. With many years of engineering and employee experience, Callies has grown to be the industry leader for innovative product design. Callies Performance Products takes pride in staying ahead of the competition with the