Hi plost, I've been running strait cuts for some time now, I run them cause I run quite alot of spring pressure.
Stock gears with lots of spring presure, will wear the cam thrust bearing faster, which increases end play, and as the thrust wears, the cam lobes lose alignment wiith the lifters.
I, thought I could deal with the whinning, well I have and for too long, cause it's driving me up the FN wall.
Mine, I laped, but I didn't have them coated, then I don't think coating them would of quited them, that much. Another thing about strait cuts, like after market alum cam gears they are made to fit alot of cases, and their made in a -3, and what that is the size of the cam gear, to fit a particular case, when the line bore was originaly done, each case is different, due to set up and core shift, and the difference between the crank bore & the cam bore was not exact, the diistance's were made up in the cam gears sizes, examples: 0, +1, +2, +3, & -1, -2, -3, where the cam bore was closer to the crank a smaller dia. came gear was needed, hence the minus sizes, and when the cam bore was farther away from the crank bore + sizes were used.
In, my motor, I've used a after market aluminum -3 gear, and a stait cut -3, and the strait cut, had considerably more gear lash than the supposedly same size aluminum -3. There is some of the whine issue.
You'll, not run the kind of spring pressures I do, so you don't need them, and may be they sound cool in some one elses car, drive with them for over a year
the coolness will wear off
.
I'am pulling my motor, to due a new modified rod swap, and pistons and cylinders and I am pulling the strait cuts. I want some peace and quit for a while
.