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Old 09-05-2001, 02:45 PM
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Join Date: Sep 2001
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Default Adjustments on Adjustable Valve-Train for my 390???

I have posted this on another forum in hopes of receiving some suggestions soon - as I feeling pretty down after my experieinces... please read on.

I am looking for the proper adjustment on my 390 that now has adjustable rockers and hydrolic cam (valve lash). I have been told several different adjustments and have had no luck - I continue to here lots of tapping. Here is what I have done:

Installed New Edelbrock Performer RPM CAM, Intake, Timing Chain, Carberator and Aluminum Heads. Crane lifters and 9.235 ball and cup pushrods.

I was told to adjust the screw on the rockers to "0" clearance - this didn't work - too much tapping.

Another suggested the same but, give the screw another half turn... adjusting the Intake valve when the exhaust lifter just starts to rise and adjusting the Exhaust valve when the Intake lifter just stops coming down - this produced the same results.

Again, I was told that sometimes the adjusting screw may require a full to 1.5 turn - this seemed wrong, but I tried it. Same result.

I read in a book about FE engines (when using adjustable rockers) to adjust the valves to 0.110- to 0.210- lash on the first piston @ TDC (as was the case with all the other tries - starting at TDC). Movning on, 1 quarter turn to the next piston in the firing order and adjusting the intake and exhaust valves...etc, until all valves are complete.

This last one i have not tried because I was told that it was absolutely wrong (by someone else) - they said i would have lots of tapping for sure.

At this point I am extremely frustrated and have been unable to move forward. Would someone please shed some light on my dilema? I could really use some help.

Lastly - I did change the length of Pushrod I was using as the first set seemed too short... the locking nut was at the tip of the adjusting screw and was practically falling off. The new rods are 9.36 - which seem to fit better.

Thanks

Don
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