BLP Products is proud to introduce a NEW external linkage system for the Holley® 4500 HP series carburetors. This revolutionary design moves all the linkage from underneath the carburetor allowing the racer to change linkage ratios from 1:1 to 3 different progressions all on the outside of the carburetor. Each change can be made within seconds.
• Thinned throttle shafts provide up to an extra 15 CFM over a stock throttle shaft
• 4 different progressions available in a matter of a few seconds. No more tearing the carburetor completely apart to change linkage ratios
• Available for four different bore sizes 2.000-2.125-2.190-2.375

External Throttle Linkage shaft Kit, 4500
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4500 throttle return Spring for BLP BX Applications
Spring, 4500 throttle return. Torsion Spring BX Series Carburetors$3.85... more info -
Link Pins. For external BLP linkage 4150-4500
Link Pins. For external BLP linkage 4150 and 4500 applications$2.15... more info -
Primary 4500 External shaft
Pri Shaft for External 4500 Linkage 2.000, 2.125, 2.200 sizes available.$49.95... more info -
Primary 4500 External shaft
Pri Shaft for External 4500 Linkage 2.000, 2.125, 2.200 sizes available.$49.95... more info -
Secondary Anti Stick Kit. Bolt on BLP Linkage
Reduce chances on having your secondary linkage stick. This can occur due to corrosion or tight tolerances or geometric issues cause during...$15.75... more info -
Secondary Shaft External Linkage 4500
External 4500 Series throttle shaft for 2.000 and 2.125 applications$49.95... more info -
Secondary Shaft External Linkage 4500
External 4500 Series throttle shaft for 2.000 and 2.125 applications$49.95... more info -
BLP 4500 External linkage kit
External linkage kit. Please select bore size below.$185.00... more info