Having done engines for longer than I care to admit and what I find is people over cam and under head engines.
Very few heads have the port volume to support the size of valves that are in even stock heads, let alone heads that have large valves.
Cams are not the issue with 90% of builds I see. Running out of air to feed larger cubes is almost always the problem.
However the bigger is better mentality of well lets put a bigger cam in and it will run faster is not going to cure this and only makes for an engine that has poor manners.
The other issue I always encounter is a lot of guys want to see 6500 to 7000 rpms on the tach. To make power and see higher rpms in an engine you must have cylinder
heads that can feed it. The cam isn't failing the engine the heads are. I have a Comp Cams Extreme Energy XR274R 236/242 @ .050", .564"/ .570" in my 499RB.
[URL]https://www.compcams.com/xtrem...d-roller-cam-3-bolt-for-chrysler-383-440.html[/URL]
More than once I've been told I am way under cammed for an engine this size. Yet it has great street manners and is still pulling like a freight train when I shift at 6200 rpms.
Big cams are a poor band aid for under performing heads.
Tom
