I just found a quote from the late great expert cam designer Harold Brookshire, that I had saved in my notepad, and this has to do with an earlier post I made in this thread. I guess i was getting the [email protected]
specs mixed up with [email protected]
specs which is what Harold often focused on to display what he called "MAJOR INTENSITY"of a cam lobe profile
which is the difference in degrees between the [email protected]
" lift and the [email protected]
" lift of any cam. The lower that this "major intensity" number is, then the steeper the ramps of the camshaft lobe are. What this means is, the closer in degrees that the [email protected]
" spec is to the [email protected]
" spec, the steeper the closing and opening ramps of the lobe is, and the bigger the "area under the curve" of the lobe profile is. This "major intensity" number of the cam lobe profile, represents how long and wide the valves are held open by the cam lobe profile. I have not found any racing cam lobe profiles with a Major intensity number lower than 27 with most high perf street cam lobes having a Major intensity number of 34-39 and going as high as 42. Harold's cam family that he mentioned here having a MI number of 31 represents some very intense lobe profiles which should make some major power in properly matched engine combinations. Here's is quote below: (BTW, I do not know what he ment by "Peak positive acceleration rates" concerning lobe profiles)....
"I have a family of cams in .725", .775", .825" and .875" that all have the same opening ramps, and the same closing ramps, even the same peak positive acceleration rates. I use the .725" lift cams as daily street drivers in 496-540 engines. All lifts are in every 4 degree spacings, and we have had no trouble in valve spring life, either on the street or the track.....
LSA for the stroke and stick transmission would be 114. This would flatten out your torque curve, so you could try to hook it up on the street. The torque curve would be very flat. A 499 with a 284/292 on a 112 had 625 ftlbs at 5000 and 7200, 689 at 6100.
You would have usable torque even at 2500.
This family of cams has 31 degrees Major Intensity, so a 276/288 at .050 would be 307/319 at .020. If you want to go smaller at .050, we should look at lower valve lifts, like the .775" or the .725" series."