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Holley Throttle Shaft Conversion Kits - 1:1 Ratio - 1-11/16" Throttle Bore DRP Performance Products cutting the amount of bushingCarburetor Throttle Shaft Conversion Kits. 1: 1 linkage ratio 1 11 16" throttle bore size. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products