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Yes it is a direct replacement. It is the original fan used on the civi models. I installed one on my M1028A1. It works very well.

I couple of months back I found a repo of the original 20 inch 7 blade fan used on the civi 6.2 and 454. It's part number OER 3991431. Summit racing is has them for $70. My 82 K20 has this fan. For those of us in hot climates this might be the way to go.

According to the Hayden website the Severe Duty fan clutch that we use turns at 80 to 90% of the pump shaft speed when engaged. And 20 to 30% when not. So when you turn the engine off, if the fan continues to spin for more that a second or two max it is bad. It should stop almost instantly when...