IMO 0 Spread is fine and a duration spread is not needed in most cases for a bracket car.

With 0 spread like the MP cams have you can run deep into the 9,s with them.

Most of the power is made from the intakes lobe Duration and Lobe sep. The exhausts lobes were just a duplicate of that in the past and that theory works out just Fine

The only reason to deviate from that would be IMO

Or other wize add more Exhaust duration would be;

For a street car;

Poor flowing head exhaust ports
Full exhausts system
Stock manifolds.


For a race car;

Nitrous motor
Blown motor
Turbo motor

And High RPM motors. A higher RPM motor can be compared to a poor flowing lower Head motor.

Its a function of Time. They both would want and can be helped with more time to get the exhaust out.


With your typical bracket motor with good heads and headers a same lobe duration cam will run just as good as a dual lobe cam. Maybe even better because overlap will be reduced. mike