need help w/pedestol roller rockers???????

[vetfreak69]

just put ford raceing liffters & push rods proform roller rockers...torqued down used a .30 shim i thought push rods felt good ...started once and that all.....pulled covers found 2 pedstols busted and 2 others cracked bad....

eldebrock heads ,bbk intake& e 303 cam any help would be appreciated........thanks

 

[dcurtis]

What technique did you use to tighten them down, with that many broken it sounds like you just slapped them on and torqued them all down without finding the base of the cam for the rocker you were torquing.
Not saying that is what you did, but I have seen people just torque all of the rockers at the same time without making sure the cam was on the base of the lobe that they were adjusting.

 

[67coupe]

You should adjust valves in firing order as this follows the cam. 1-3-7-2-6-5-4-8

Adjust one cylinder at time.

1) Make sure valve to be adjusted is on the base circle of the cam. Rotate the engine in its normal direction of rotation (clockwise) and watch the exhaust valve on that particular cylinder. When the exhaust valve begins to open, stop and adjust that cylinder's intake rocker arm.
2) Install rocker and HAND tighten bolt.
3) Set torque wrench to 18 lb-ft. With torque wrench starting at the 12:00 position, tighten the rocker bolt.
4)

A - If you reach torque before 90* of rotation, remove shims until torque is reached between 90* and 1 full turn.
B - If you reach torque between 90* of rotation and 1 full turn. This rocker is adjusted correctly.
C - If you do not reach torque prior to 1 full turn, add shims until torque is reached between 90* and 1 full turn.

5) Continue to turn the engine, watching that same intake valve/rocker you just set. It will go to full open and then begin to close. When it is almost closed, stop and adjust the exhaust rocker arm on that particular cylinder. Loosen the exhaust rocker arm and follow the same procedure described before in steps 2 thru 4 to adjust this rocker arm.
6) Both valves on this cylinder are now adjusted, and you can move on to your next cylinder and follow the same procedure again.

There may be some initial valvetrain noise when the engine is first fired up but once oil pressure has stabilized and the engine heats up, it should quiet right down to a normal level.