The best change I've made is the new aluminum radiator and twin Spal electric fans with digital controller. I just got the install finished last night. It was running hotter than I'd liked (200-210*) and got especially warm at the Car Craft show where I had to pull over and let it cool down on the show grounds, which was not fun. Staring at my new Autometer temp gauge the whole time took alot of fun out of it.
Fortunately, my buddies tents were right next to Universal Parts Inc, an outfit out of Humbolt, IA that specializes in aluminum radiators with Spal fans. I got the whole set-up for $800, with the digital controller, relay, sensor, etc. I bought it on the spot. It's the best looking, and highest quality set-up I've seen for that kind of money. Fully welded, no epoxy.
Drove it to work today, and am very pleased. So much quieter and smoother without that big mechanical fan blowing. I was in such a state that I didn't realize the one I got was for an Automatic...it didn't occur to me that they may have a Manual version. Well, not much difference other than the fittings for the trans cooler. I am going to block them off with some plugs for now, but am thinking about turning it into a PS cooler...not sure if it'll be adequate for an oil cooler.
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1969 Firebird, Black w/Parchment Arizen interior, 383 Pontiac Stroker (350/428 crank), TKO600, Moser 12 bolt, 18" TTII's, Hotchkis, GW, DSE, Speed Tech, Vintage A/C, etc.
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