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Hello moparts maybe you can help me understand more about .050 cam duration specs. I've talked to several cam manufacturers and people who know cams
supposely. How is it that guys are able to run 252° duration and run deep into 10's? How do you make enough low and top end power in a smaller ci with that conservitive amount of duration. I've heard people suggest 252-258° and 've heard 272-276 @ .050. Also some say between 520-550 lift and some say 620-660 lift. It just doesn't make any sence to me. Either of the cam specs seem to run good under most engine combos. Either 1 guy is shifting at 6000 or the other is 7500. But then I hear people shifting these low duration cams high? My combo is a 344 ci with W2 heads ported, 2.08" intake valves. M1 intake manifold with a lot of work, between 12:1/13:1 cr, 1 7/8 headers, 850 e85 holley carb, and I am wondering what the right cam choice is for this setup. Attended goal is mid 10's.. I'd just like to know something that multiple would agree on so it's not like well 5 guys have this and that opinion and the other 5 have the same opinion. Thanks Moparts



The biggest difference you need to look at is what TYPE of cam...Solid roller, solid FT, hyd. FT, or Hyd. roller. Duration @ .050 is just a point on the lobe the lifter hits...and the shape of the "curve" will look very different between all these cam types.

My 360 in my duster ran 10.50's and 10.60's with a solid FT cam that was 264@ .050 and made peak HP at 7300 on my dyno. It also had W2 heads. Before that, I had a solid FT cam that was 250-258@ .050 and peaked at 7100rpm.

You have to take everything about the car/engine and intended usage into consideration when spec'ing a cam IMO. It also doesn't hurt to have experience.

Brian

Brian Hafliger