Reply to "Headers"

> Shops build custom anti-reversion plates for 351-Cs that do exactly
> the same thing, to add power or torque to an engine, and you'll be
> getting most of this free. Worth a try, especially since you already
> have some type of 4V headers that came with the car.

Vizard's dyno tests indicate that anti-reversion cones (the cones
worked better than a step) only work in the presence of a crossover
pipe at or near the header collectors. Also the effect worked best
on engines with relatively tight (108 degrees or so) lobe centers.
Cylcone had the patents on the AR headers but were bought out by one
of the other header manufacturers. I called them and they said they
dropped the entire line of AR flanged headers and claimed they didn't
perform as advertised. They may have done this for cost reasons but
if they did test, my guess they were tested on an engine without a
crossover and/or with wide lobe separation.

Dan Jones