318 heads. whats your route??

bill55az said
With the magnum 1.6 ratio rockers, the lift changes to .387 and .427 and duration changes a little.

What kind of cam should I use to get a mild performance increase without sacrificing gas mileage much? I like lots of passing power/torque in second gear, when I need it, but racing is totally out of the question.
Is the stock cam good enough considering the much improved flow of magnum heads?

Bill, the duration doesn't change. The cam will open the valves at the same time everytime no matter the rocker ratio. It will just open them up quicker. The change in rocker ratio will add intenscity to the cam.

This cam is about as close to one step up from stock.
http://cranecams.com/?show=browsePa...=318 C.I.&partNumber=693901&partType=camshaft

Though I like the Crane equal to the sumitt cam better because of more lift. The sumitt cam is ground by Crane for and too Sumitt's specs.
http://cranecams.com/?show=browsePa...=318 C.I.&partNumber=693941&partType=camshaft

I've used this cam before and found it to make good power on the road even with a stock converter, 3.23/3.21 gears and stock tire diameters. Also in a search for mileage, I installed Rhoads lifters with this cam. It help with more vacuum and a slight help in low end torque. The cam is small and so the difference was also small. Noticable, but small.

Comp Cams also has a line that is ground for and to be used with exhaust manifolds. Home page here;
http://www.compcams.com/DefaultWide.asp

Catolog page here;
http://www.compcams.com/technical/Catalogs/106-07/26-37_228-229.pdf
Scroll down to Dual energy cams when you open the PDF.