|
A cam is "legal" when it's company pays to get the cams tested in an otherwise stock engine. The test basically doesn't let you tune the EFI because that's considered tampering with emissions equipment. So they have to pass the emissions requirements for every state to be called 50-state legal.
Most of GM's "hot" cams are very mild, just well designed where as the aftermarket has each other to compete with and so they push the limits of the ramp rates (how fast the cam opens). By having a high ramp rate you'll fill the cylinder with more air and fuel causing all emissions to increase.
Most of the time it just has to do with them paying $$$ to get the cam through the testing. I've gotten plenty of "hot" aftermarket cams to pass emissions requirements. Make sence? Basically comp cams hasn't seen the demand to require testing of those hotter cams.
__________________
, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue 
|