Callies Ultra Billet Crankshaft, 4.250" Stroke, LS1,

Callies Ultra billets are machined from Premium Grade Timken alloy steel. This high quality steel creates a level of toughness that is unmatched in the crankshaft industry. Each Ultra billet crankshaft is uniquely machined with Ultra-Shed counterweight profiles. The Ultra-Shed profile gently moves oil away from the oncoming counterweight while the directional trailing edge directs oil away from the oncoming rod journal. Aero-Shed Super Finish is then used to give you a crankshaft that is totally stress-riser free and incredibly aero efficient. When the Ultra-Shed and Aero-Shed processes are combined, the result is a crankshaft with the lowest coefficient of drag in the industry.

Features:

• Stroke Range: 2.600 in – 4.600 in.
• LS1, LS7, LT1 posts are available
• 6, 8, or 9 bolt pattern flange options
• Rod Sizes: 1.850, 1.888, 2.000, 2.100, 2.200 w/sbc width, 2.200 BBC width
• Main Journal Sizes: Standard LS, Iron Duke, Ford Cleveland 351
• 8 or 6 counterweight designs available
• Sold complete w/no drill balance
• Aero efficient Ultra-Shed counterweight profiling is standard
• Aero-Shed super finishing included with all Ultra Billets
• All Ultra LS billets are produced from Timken 4330 alloy steel