Camshaft help

Lugnutz said
I also found a little information that broke down the duration by groups for anybody searching in the future.

Class I (200° - 215°)
Good idle quality. Low rpm torque and mid range performance.Will work with
stock or slightly modified engine. Manual or auto transmission. Good vacuum.

Class II (215° - 230°)
Fair idle quality. Good low to mid range torque and horsepower. Will work with
stock or modified engine. For use with manual or automatic transmission with mild stall converter. Lower vacuum than stock.

Class III (230° - 245°)
Rough idle quality. Good mid to high rpm torque and horsepower. For use with manual transmission or high stall automatic. Requires improved induction, exhaust system, and ignition system. Good street/strip cam, but has low vacuum.

Class IV (245° - UP)
Rough idle quality. Good high rpm torque and horsepower. For serious racing.
Need proper selection of rear axle ratio and improvements in carburetion and exhaust systems. For use with manual transmission or automatic with very high
stall converter. Will not have enough vacuum for power accessories.

I'm not sure where you found this, or what engine size it's referring to but it's so vague, subjective and outdated it's pretty much BS.

LSA has a huge impact on idle quality. HUGE... This makes no mention of it, only duration, which is only half the story. It also doesn't mention compression, heads, carburation, timing, etc.

"high stall convertor"? What's high? To me its 4500 and up. The last 2 convertors I've run have been a 3500 and a 4000. You'd never know they were anything other than a stock convertor under normal driving conditions.

Axle ratio, if you want the best of both world's here get her a GVOD unit. You won't regret it. I run the interstate with 4:56 gears without issue.