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I'll be adding a dewitts Al radiator and dual spals, so I was thinking of adding a spreader bar too. I've seen many, and I had a topic from a while back that is lost from the forum server change. So, how effective are they? Yay or nay?
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
I added one to my convertible and I can tell you it does make a difference. The whole car seems more solid with the bar in place. To me, it was worth the $90 or so when I bought mine.
I installed one from VB&P in my '73 back in the early 90's as an all out effort to improve my cars autocross manners. I did this along with lowering, upgrading to complete F-41 suspension, polyurethane bushings and new shocks. When I installed the spreader bar, I set the adjustment with the weight on the wheels. At this point I could quite easily twist the bar about the Heim joints by hand. I later lifted the car (front wheels off the ground with suspension fully extended) via the front crossmember. I happened to grab the bar and noticed that I could no longer twist it by hand; it was under that much tension. I would not have believed that the front suspension flexed that much, but apparently it does.
I guess you could always measure the distance between the two top a-arm cross shafts with the weight on the wheels and then pick it up via the crossmember and measure it again. I would not be surprised to see half an inch or more…
Going by seat of the pants feel, I'd say definitely yes. Since front frame flex is such a documented problem, It can't help but work. All you have to do is take a look at how high up the upper control arm mounts are, basically unsupported, to see how it would be a good thing. Let us know what you think after it's mounted. I sure like mine.
I believe the ONLY way to get them on is with an electrical fan.
I have a Guldstrand spreader bar installed, with a mechanical fan. It was a close fit, but it does work. I believe that a big block car must use an electric fan, but it's not a problem with the small blocks.
They'll fit with a stock fan on a SB (runs under the fan hub), but no way on a BB. It's just as well, because most BB (including mine with A/C) cars barely stayed cool on real hot days, like here in NorCal during the summer, so the alloy rad/electric fan setup is the way to go. I've kept all the stock stuff, but I doubt I'll ever go back.
Is this a bolt in mod or does it need to be welded in?
Once the "ears" are welded on, it is bolted into the car. The kit can be purchased either pre-welded or un-welded. The pre-welded is for those cars where fan interference is not an issue. On vehicles wanting to retain the stock fan, an un-welded kit is available. This is the one I used. I inserted the flat bracket and mocked up the "ears" so that the bar fit between my fan and crank pulley. I marked them and took them to a shop to weld. Painted everything, reinstalled them in the car and added the cross bar. Looks good, works well… and lasts a very long time… GUSTO
I think Norval needs to make his bar as a kit. That thing is sweet. Heck, I could make the brackets...I just don't have the equipment, taps and bar stock to make the bar.