340 dyno chart thoughts
It's definitely possible. For example. Looking at hughes STL5054AS-8. It has 250/254 duration. 108LSA. Guess what the overlap is? 66. Very mild compared to the duration. My XE274H has an overlap of 60. And it's 230/236 duration with 110LSA.
There's a very simple explanation for this.
By my calculations. if the STL5054AS-8 camshaft is 60 degrees overlap on 108 LSA with 250/254 @ 0.050" as you mentioned, that means it must be 274/278 advertised duration (i couldn't find them listed on their webpage).
So you probably think that the hughes cam is way faster ramp rate than the comp cam, right?
Hughes, 278/282 advertised duration, 250/254 @ 0.050"
Comp, 274/278 advertised duration 230/236 @ 0.050"
Not so fast.
The hughes STL5054AS-8 camshaft is a solid cam, the COMP XE274H is a hydraulic.
The standard for measuring Solid cams is 0.020" for advertised duration.
The standard for measuring Hydraulic cams is 0.006" for advertised duration.
if you get a camshaft, ANY camshaft.. and measure it's duration by both these specs. you will have more degrees at 0.006" compared to 0.020".
In the example you gave, it has little to do with how aggressive the lobe is and is almost entirely because of the difference between how each one is being measured in a different way.
