In short....Pedestal mount are more for stock applications where decking wasn't involved or big profile cams. Easy to install as long as you check the geometry.
Stud are better for adjusting to changes in the engine. You should you use these if you get into custom cams, large heads etc.
The 1.6 moves the valve a distance that equals the lift measurement of the
cam, times 1.6. So the 1.7 opens it a little bit farther.
In short....Pedestal mount are more for stock applications where decking wasn't involved or big profile cams. Easy to install as long as you check the geometry.
Stud are better for adjusting to changes in the engine. You should you use these if you get into custom cams, large heads etc.
The 1.6 moves the valve a distance that equals the lift measurement of the
cam, times 1.6. So the 1.7 opens it a little bit farther.
The geometry is the angle of the pushrod on the rocker arm, the rocker arm on the vavle spring etc.
Having the geometry right is vital to ensure proper operation of the valve train, and to avoid wear on parts.
Decking the head means you actually remove some material from the bottom of the head, the part that goes against the block, to "move" the valve closer to the piston. One would do this to either "adjust" compression or to ensure a smooth mating surface against the block.