Re: Fan clutch
If you mean in the head, it's not uncommon to see a good bit higher temp there than what your thermostat rating is. Also consider that your t-stat just starts to open at 180 and will be fully open at about 195. For instance, I read about 175 on my ECT sensor in the intake when the mechanical gauge in the head reads 190+ with a 180 t-stat. When my car warms up, my mechanical gauge will run to about 195 and then you can see the t-stat open up. I never see over 180 on the intake manifold sensor. Pinging the engine all over with an infrared gun showed the manifold reading was closer to actual.
That said, if you've got the HD fan then there's no reason not to put on the HD clutch as well.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled