Holley Tri-Power Six Pack Secondary Diaphragm 135-6

• Direct replacement vacuum secondary diaphragm for Holley Six Pack and Tri-power outer carburettors
• Fits both front and rear outboard carburettors on Mopar 440 and 340 engines
• Also suits GM Chevrolet Tri-power systems including Corvette applications

This vacuum secondary diaphragm is designed for the outboard carburettors used in Holley Tri-power and Six Pack systems. On these 3x2 arrangements, the centre carburettor handles primary running while the front and rear units operate as vacuum-controlled secondaries, opening progressively under load. A faulty diaphragm is one of the most common causes of poor Six Pack performance, hesitation, or failure of the outer carburettors to engage. This replacement unit restores proper actuation on both the front and rear carburettors and is suitable for Mopar Six Pack engines as well as GM Chevrolet Tri-power applications including late 1960s Corvettes. It matches all known Holley outboard carburettor list numbers that use this style of vacuum pod.

Specifications

• Product: Holley Tri-Power / Six Pack Secondary Diaphragm
• Application: Outboard (front and rear) vacuum-operated carburettors
• Vehicle Fitment: Mopar 440 and 340, GM Chevrolet Tri-power including Corvette
• Carburettor Operation: Vacuum secondary
• Compatible Holley List Numbers: R3659, R4365-1, R4382-1, R4383-1, R4393-2, R4394-2, R4671, R4672, R4789, R4790
• Fuel Type: Petrol (gasoline)

Inclusions

• Replacement vacuum secondary diaphragm
• Correct sealing lip for Holley outboard pods