What rocker arm ratios do people see? Options

[stugray]

I am adjusting the valve geometry while putting in a Raby 9700 cam and I am seeing .38 on the exhaust cam lift and .496 at the valve (an exh rocker ratio of 1.3) and I have a .39 on the intake with a .546 at the valve ( an int rocker ratio of 1.4) is this what everyone else gets for rocker ratios:

Intake rocker ratio = 1.4
Exhaust rocker ratio = 1.3

These are the 1.7 (1.8?) rockers that accept the 911 swivel feet.
I am using the swivel feet, have modified the rocker faces, adjustable push rod, and zero lash to do the meaurements.

Do those rocker ratios look like stock?

I want to take 50 thousandths off the Combustion chambers to increase the CR, but my measurements say I wont have enough clearance on the Intake valve once I shave off 50 thousandths.

I only have ~0.075 clearance now from the piston to the Int valve as it is with a deck of 0.030 and everything else (crank & rods) stock - flat top 96mm pistons.

That Intake valve travel of ~0.55 looks huge to me. Anyone else care to comment?

Stu

[stugray]

Important lesson learned!

I cut the pushrods to 270mm and assembled the 3/4 side and the valve geometry was completely messed up between 3 & 4. I was pissed!

My son noticed that even with the rockers torqued, they were not flat against the head. The larger studs that Jake sells were not fully seated into the heads and the rockers were sitting against the shoulder of the stud!

Ran them in and geo is now perfect between the two.

Just another thing that can screw you up when doing these measurements.
Still does not affect my rocker ratio measurements, just glad I measured all 4 cylinders before cutting the pushrods. If I had decided the length based on that one cyl, they would have all been wrong.

Stu

[worn]

Important lesson learned!

I cut the pushrods to 270mm and assembled the 3/4 side and the valve geometry was completely messed up between 3 & 4. I was pissed!

My son noticed that even with the rockers torqued, they were not flat against the head. The larger studs that Jake sells were not fully seated into the heads and the rockers were sitting against the shoulder of the stud!

Ran them in and geo is now perfect between the two.

Just another thing that can screw you up when doing these measurements.
Still does not affect my rocker ratio measurements, just glad I measured all 4 cylinders before cutting the pushrods. If I had decided the length based on that one cyl, they would have all been wrong.

Stu

I am not sure I remember what the studs look like on your head, but the stock studs have a wide shoulder above the threads for locating the towers. Like a dowel. I didn't understand this at first and made the holes in my shims too small for the shoulder. I doubt the locating shoulders are critical.