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]

Ok, so I decided to go with a webcam 86b instead of the other.

I measured it prior to installation.
The wecam 86b has an advertised "Valve Lift" of .500/.500 Int/Exh.
http://www.webcamshafts.com/pages/automobi...691_001095.html

So I measure the cam and get: .365/.365 lift at the cam.

.365 * 1.37 = .500 valve lift.

So apparently Webcam knows that these rockers are closer to 1.4 than 1.3, but I must just be a "mentally ill idiot" just like webcam.....

So based on the advice above (Type-IV rockers are always 1.3), I need to adjust these rockers until I get a valve lift of .365*1.3 = .474 instead of the advertised valve lift of .500.

So which is it? Both webcam and I must be "off our rockers"

I now have just what I needed. Valve lift of less than .510 on both int & exh. and I can dial my deck height to get a close as possible valve clearance whie maximizing CR.

Thank you webcam.
Stu