I just got done installing a TPIS ZZ-9 Camshaft in my L98 TPI (1988 GTA 5.7L). I have Comp Cams 1.52 Ratio Self-aligning Roller Rockers. With the increased lift on the camshaft, the rocker arm travels so much more that I can't get a socket on the adjusting nut on the rocker arm. I tried to adjust the valve lash while the engine is running but it is impossible. The socket keeps being thrown from the rocker arm. I called TPIS for some advice but they told me to:
Adjusting lifters is the last of the assembly steps. It is also a good place to get messed up. The following procedure works for all 4-stroke engines:

1. Insert all pushrods.

2. Pick any cylinder to start with.

3. Turn motor over until you just see the exhaust pushrod move.

4. Install the intake rocker arm.

5. Install the rocker arm adjusting nut.

6. Tighten nut until all free play is gone. (Be careful not to collapse lifter)

7. Turn motor over until intake pushrod opens all the way and then just close. Now repeat steps 4 through 6 for the exhaust rockers.

8. Do all the other cylinders.

9. Now tighten all adjusting nuts one more turn.


Should I follow this advice? Will i have to do a readjustment after the engine is running or can I stick to this? Thanks.

Joe

 

It *should* work, but I'd do the adjustment to each one at the time of zero lash...reason is, as you rotate the motor, you could collapse the other lifters some...but not likely if nothing has been tightened yet...

 

I always use a hand held starter connected to the starter. One clip goes to the solenoid 12 volt terminal and the other clip to the "S" terminal.

Then I can stand at the engine and bump it over as I watch the rocker movement. Makes the job really easy too.

I sent you a file showing the step by step procedure on adjusting them.

Let me know how you make out.

Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9