Holley 4000 Secondary Spring

Autolite 4100, Holley 4000 Secondary Spring 66-450

3 Review(s)

Your Price: $6.95

Part Number: 66-450

Availability: In Stock

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Secondary diaphragm spring for the Autolite / Motorcraft 4100.

Also works on the Holley 4000 secondary diaphragms.

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5.0

Autolite 4100. Holley 4000 Sec. Spring

Perfect replacement for my Autolite 4100 carb. Secondaries now open properly. Fast delivery from WA to MD.

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Reviewed by: Rex Root from Winfield, MD on 4/22/2019

Carb spring

My son's 1965 galaxie with auto lite 4100 was missing this spring.works great now !

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Reviewed by: Joe Bednarczyk from Ironton on 8/1/2026

it works!

Just what I needed to keep my secondary from sticking on.

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Reviewed by: David from MI on 5/15/2020