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most Holley carburetors are built with the Duracon float but
1968-1985 Mercury Cougar
For heavily-loaded vehicles
The Endurance Plus series of valve springs utilizes a specially processed Tool Room Material outer spring for increased endurance/reliability beyond the "SP" series
Wilwood GT 48 Curved Vane Rotor RH SSMK most Holley carburetors are builtWilwood's GT 48 Curved Vane Spec 37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision