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Holley Performance 135-4 Vacuum Secondary Diaphragm

Carburetor Diaphragm

Vacuum Secondary Diaphragm

Vacuum Secondary Diaphragm; Carburetor Model Numbers R1849/R3310/R4452-1/R4548/R6520/R6619/R6909/R7002/R7154/R7351/R7855;

  • WARNING CA Proposition 65: No

  • Vacuum Secondary Diaphragm

Vacuum secondaries are activated by venturii velocity through the primary venturii and further aided by secondary venturii velocity. Engine/manifold vacuum is not related and has no effect on the operation of the carburetors secondary system.

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 well as our products for fits GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress-up products for street performance, race and marine applications. As a single solution, or partnered 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.