Cams for 318's

rumblefish360 said

This isn‘t exactly true.
What is missed is the fact that duration does two things. It controls the operational rpm range and how long the valves are open to ingest air and fuel.

IF the supporting cast of parts are not employed to make an effective full use of the extra air & fuel, less power can be the result.

A larger duration cam will have a higher operating RPM range as the plus in making more power but has the draw back or not making any decent power in the lower operating RPM range. The larger the duration the more power you can possibly make at a higher RPM at the cost or lower RPM power.

Dave Freiburger said, and I so whole heartily agree, afford the best cylinder head you can.

There is NO magic cam for any engine of any displacement. PERIOD!

Click to expand...

:thumbsup: to that last line! BTW, Hughes claim to fame is " real Chrysler cams" designed around .904 base circle lifters -verses chevy blanks. You can't have it all, so consider where your engine is going to be spending most of it's time ( rpm wise ), and use that info as part of your choice criteria. Other areas often not considered are where you live ( 5000 ft above sea level or a little closer to the water. Running vacuum accessories? In many cases, smaller can be better.




A larger duration cam will have a higher operating RPM range as the plus in making more power but has the draw back or not making any decent power in the lower operating RPM range. The larger the duration the more power you can possibly make at a higher RPM at the cost or lower RPM power.

Dave Freiburger said, and I so whole heartily agree, afford the best cylinder head you can.

There is NO magic cam for any engine of any displacement. PERIOD![/QUOTE]