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]

I have found (after testing 8 sets of rockers) that the Intakes tend to be ~1.36-1.38 while the Exhausts are 1.3-1.32.

Now of course you can adjust SOME via pushrod length or rocker spacers (I have both), so we shall see. I expect to break down and remove the other cam and insert the webcam this weekend.

I used every adjustment technique suggested above and could not get my Intake vale Lift to less than .520 with that cam (without ridiculous rocker spacers).
It was just not the right cam for my engine.

This is why we measure (per Jakes recommendations) instead of just accepting myth & "internet expert's" advice.
If I had just accepted "on faith" that the Intake rocker was OK based on the 1.3 value & my calculations, I should have been fine.
But after measuring with the valve travel/dial indicator, and the "clay on the piston" method I would have broken an intake valve during the cam break in period.

We are all good now while still using Jake's recommended valve train geometry adjustment instructions.

I will try to take a lot of pics the second time through.

Stu