"Old School" Stocker Cams

[astikhossw]

One is a stocker and they both have the same lift and duration.

[Mike Jones]

Originally Posted by astikhossw

One is a stocker and they both have the same lift and duration.

Same duration?

[impstocker]

Originally Posted by astikhossw

One is a stocker and they both have the same lift and duration.

OK..I think I get it now..the lift is the same..the duration being the same amount of degree's the valve is open as the stock cam..but with the square lobe the "dwell" time of the valve stays open is the big difference. ? right?

Is this a actual old stocker cam you show..another words those old cams had square lobes too?

The cam in my 396/325 is square lobe..but has more duration built into it, right?

Did they also change the LSA, lobe separation angle of the race cam compared to the stock cam too? More overlap for higher RPM?

Thanks for the lesson! I think it makes more sense to me.

Will Lamprecht
65 Imp...

[Dwight Southerland]

Maybe not more measured duration from open to close, but more "effective duration" due to opening the valve quicker and closing slower so that the valve is further off the seat for a longer period of time and thus allows more air to flow. "Area under the curve"

[Mark Yacavone]

Originally Posted by Dwight Southerland

Maybe not more measured duration from open to close, but more "effective duration" due to opening the valve quicker and closing slower so that the valve is further off the seat for a longer period of time and thus allows more air to flow. "Area under the curve"

Right..and the duration specs were listed as .001 to .001 or less :-0
It's hard to compare those specs to .."@ .050, today, because that term was not part of the mix.