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Old 01-12-2005, 09:50 PM
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Help in adjusting new roller rocker arms

Need some help in adjusting new roller rocker arms.
I just installed new 1.6 roller rockers into a 327 SBC.
I adjusted with engine running
tighted till the clatter stopped then 1/2 turn more.
Is that the right way to do it?
After I completed the adjustment and started the
motor it now misses and backfires on heavy acceleration.
Didnt do that before and I didnt mess with the timing.
What did I do wrong and what do I do to correct the problem?
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Old 01-12-2005, 09:59 PM
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Assuming you have hydraulic lifters, I like to adjust the valves the way Lunati suggests; with the engine off, get the lifter you're adjusting on the base circle of the cam. For intake valves, IIRC, wait til its corresponding exhaust valve is opened all the way and just starts back closing, then adjust the intake valve. For exhaust valves, wait until the intake valve is like 2/3 the way open then adjust. I always ran 1/2 turn of preload on hydraulic lifters, I used polylocks; 3/8 turn, tighten the set allen screw, then the last 1/8 turn. Always worked well for me, assuming my memory is right on the when to do the adjusting...
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Old 01-12-2005, 10:12 PM
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Shouldn't adjust them while running IMO.

Get the lifters so they are off a lobe (valves closed) then take up the up and down play in the pushrod. Once the up and down play is gone go 3/4 turn past that. Using this method I haven't had to readjust valves later on to date.

Recheck timing as well.
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Old 01-12-2005, 10:22 PM
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Hi All
Thanks for the quick resopnses.
Forgot to mention they are hydralic lifters.
I will do as you guys advice. Adjust with engine off.
I have one more question....
Why is it missing and backfiring If didnt mess with the timing?
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Old 01-12-2005, 11:01 PM
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If a valve is adjusted too tight, it will always remain open, thus causing the backfire. If one is too loose, it never opens to allow gas and air into the cylinder, thus you have a miss.

However verify spark plug wires in the correct locations, and the timing and distributor are in the proper location. Also, I would throw a new set of spark plugs in once you have the valves adjusted.
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Old 01-12-2005, 11:32 PM
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Thanks to all for the help.
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Old 01-13-2005, 05:37 AM
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"kinda" the same as retarding/advancing the cam on the sprocket

less preload= the cam begins to move the push rod/valve later

more preload= the valve opens sooner = ? backfire depending on ign timing and cam profile

SBF's like a 1/4 turn most often, need help on the exhaust side, ? depends on your motor combo

that 1/4" range make a big difference (I prefer to tune with the motor running AND warmed up and as the last fine tuning adjustment)

Last edited by red65mustang; 01-13-2005 at 05:46 AM.
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Old 01-13-2005, 12:38 PM
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Using a poly lock and clean threads you should be able to turn the lock nut with a finger. Adjusting these is simple. turn lock untill it stopsusing a finger, then 1/8 to 1/4 more and tighten set screw. No up and down movement or spinning of pushrods is needed.
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