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Hi John,
My '83 245 has an original (or nearly) copper/brass radiator with four holes in the flanges, top and bottom. Two screws at top attach (belt-driven) fan shroud, other two (bottom)holes unused. An electric fan/shroud assembly from an '86 Olds FWD Cutlass had four holes in nearly perfect spots, coverage of radiator was excellent once thing was screwed into place w/ some long 2-3" self-tapping screws. Perhaps you could drill 4 holes (in flanges, if any ) in your present rad, am not familiar w/ what came in 87. Aluminum is cheapest metal on the planet....
Mechanical fan is now gone as is enormous shroud since electric jobby comes already "shrouded". Car benefits IMHO, easier maintenance, smoother idle, less vibration, more power. If electric fan does ever fail, car heater (on high) can be used cuz it's an excellent heat exchanger. May have to drive w/ no clothes on!
Did this in April and system works great. Operates manually, w/ a toggle switch on dash which energizes a relay on fender wall which energizes the fan. Used fuse 12, 8 amp for control/dash switch, 25 amp blade fuse in holder under the hood, a 30 amp cap. relay I had in parts box. I doubt the GM fan draws more than 10 amps, so what if it does? No charging/alt. battery probs. whatsoever.
Just drove the car 1000mi w/ this setup, on hot days have started the car, then flipped the toggle switch on and forgotten about it. I am used to goosing the throttle anyway, have had plenty of old cars, plus has manual shift.
Beauty of manual system is it forces you to pay attention to engine operation, temperature, and load. Temp too hot? turn fan on. Temp too cold? turn fan off.
You can always "automate" later, make other modifications as you like.
Get too it--Can provide more details of my installation if you like.
Frank
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