Metering Block Gasket; For 2300/4150/4160/4500 Models without Intermediate Idle System; 10-Pack; [Available while supplies last]; Specifications: CA Proposition 65 Warning: No Features: 10-Pack; 100 Bulk Available for 2300(TM) Model, 4150(TM) Model, 4160(TM) Model, and 4500(TM) Model; without Intermediate Circuit. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI is dominating the performance world, as are our products for the GM LS engine. Holley products also include performance fuel pumps, intake manifolds, and engine dress products for street, racing, and marine performance applications. As a standalone solution, or in combination with products from other Holley companies - Hooker Headers, Flowtech Exhaust, NOS Nitrous, Weiand, Earl's Performance Plumbing or Diablosport - Holley products can give you the edge you need over the competition.