10" diameter torque converter with 11-7/16" bolt pattern, 2400-2800 RPM Stall. Hays Performance Drivetrain is proud to announce Twister 3/4 Race Performance Torque Converters. These NEW torque converters are a perfect addition to Hays product line of performance flexplates, clutches, and flywheels. The 3/4 Race torque converter is the first series being brought to market and is intended for street/strip combinations, with various RPM stall speed offerings to accommodate any mixture of modifications including higher compression ratios, aftermarket camshafts, aftermarket cylinder heads, lower gear ratios, and vehicle weight loss. The name 3/4 Race perfectly describes a torque converter suited for an application just shy of a Full Race version. We do plan to offer Full Race torque converters in the near future. Good names never go away, and neither should good terms! Hays Twister 3/4 Race Torque Converters! *Bolts must be 3/8-16 x 3/4 to 1 inch in length and only use Grade 8 quality.. Warning: The 3/4 RACE series converters are NOT designed to be used with Nitrous Oxide or Trans-Brakes Note: HAYS recommends an external transmission cooler for all Twister 3/4 Race Converters (A minimum size of 18,000 GVW or 15,000 BTU Rating.) Note: Stall ranges will vary depending on engine set-up, weight of vehicle, and gear ratio (Please see converter selector in tech resources for more info) *Bolts must be 3/8-16 x 3/4 to 1 inch in length and only use Grade 8 quality.