I found an article by a fellow named Steve Jack. He put a chev 350 on a dyno and tested various fans for HP loss. I was shocked at the amount of loss. He also did an alternator HP loss- not much. When I get my 428 back together and on the dyno I'll take the rad, shroud and fans with me and do a test with and without the fans hooked up to get a real [for me] number of HP loss with the dual fans. I think it's higher than the 1.28. I have a 600 FP engine and over 400 at 2000rpm and when the fans come on at idle they drop the rpm about 200. We'll see when I get it on the dyno. I don't know who Steve is or how reliable the test result are but it's interesting reading. I don't know how to post a website here so I scanned the pages and will attach. Al
