My 422 smallblock build

j par said

I'm telling you you're not going to like those super hi duration cams on the street... They're not going to gain you anyting but uncomfortable driving...
the 25% of the time that you say you'll be at the track which will probably be less than that you're not going to see more than a tenth or two better time at best...

Click to expand...

Im running 255 at .050 on the street and it’s easy to drive. Doesn’t buck, chug or anything else.

As to LSA I’m in 100% agreement it is the sum of events. A tighter LSA closes the exhaust earlier. So, for any given lobe, or pair of lobes and their duration, you move the LSA to change the events. It’s that simple.

Once you determine the total duration you need for your application, you set the opening point of the intake and the closing of the exhaust. That equals the LSA. You can have an LSA from say...102 to 116 with the same set of lobes. It’s all where the cam grinder sets them.

Again, the biggest killer of lower and mid range power is an LSA that is chosen (by the timing of the events) to smooth the idle or is used to reduce intake duration and keep the power after peak HP hang on longer.

And, if you are running headers, the wider LSA is even more of a detriment. That’s not me saying this, it’s Billy Godbold.