LSA Question

273,
I read a lot of your posts & see that you are a thoughtful person. Better than the idiots who get on here & other forums & dump on DV...yet have never done any dyno testing to check out the 128 rule.
Have a look at the Cattle Dog Garage video of 33 min that tested the 128 rule. DV did his own testing....19,200 dyno pulls.

Why do people use roller cams? One reason is that they can have more lift & duration than a FT cam. So how far the valve is open, & when is it fully open would seem to me to be veeeery important. Particularly the intake valve. I doubt you would want the intake valve at max lift [ for max hp at 5* ATDC when the piston is hardly moving & not generating any useful airflow.
But you would want the valve fully open at or close to max lift when piston speed is very high & generating a high vacuum to pull as much air into the cyl while the valve is in the max open position...& make as much HP as possible. Perhaps 108 ATDC?. Bingo, a cam with 108 LSA......which has the int valve at max open 108 ATDC & the exh valve at 108 BTDC.

I would