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450HPChevelle Apr 28th, 10, 10:05 AM I have a fan clutch with the following number on it: 27050480. I'm trying to figure out if its the HD fan clutch or the standard one. Thanks, Brian SWHEATON Apr 29th, 10, 11:10 AM If you get no responce post a pic of back and front of the fan clutch ro see if we can then tell if its a std duty or hd fan clutch. The hd fan clutches have more fin area then std duty does,severe duty clutch has a ton of fin area all being thermostatic type fan clutches. Scott 450HPChevelle May 5th, 10, 10:15 AM Thanks Scott. Here are a couple pictures of my fan clutch. 30333 30334 Thanks, Brian SWHEATON May 6th, 10, 6:35 PM No matter what you were told thats a std duty fan clutch which in some cases isnt up to the task of properly cooling a bbc esp on a hot day in traffic. The HD thermostatic fan clutches have more cooling fins on them. Here are pt#'s for Hayden/Napa hd thermostatic fan clutch for sbc/bbc motors with long wather pumps. Scott ================================================== ======== HAYDEN FAN CLUTCHE 2747 H/d ================================================== NAPA TEM271303 - H/D 450HPChevelle May 6th, 10, 11:57 PM Thanks Scott, I'll add that to my car parts shopping list. :) | ||