sbc / bbc valve train adjustment
The adjustment is 1/2 turn down from zero lash. (GM MANUAL SAY'S 1 TURN)
In order for the hydraulic lifter to work correctly, it must be centered. If your valves have come out of adjustment after several thousand miles of operation, suspect your rocker arm nuts, and replace them. They do wear out after constant adjustments. When adjusting your valves, tighten all adjusting nuts until all lash is removed by feeling the rotation and up and down movement of the pushrod. Next, set your engine on TDC #1, pointer at "0". You can now adjust the following valves: INTAKE on cylinders 1,2,5,7 EXHAUST on cylinders 1,3,4,8 Loosen the adjusting nut until lash is felt by rotating the pushrod. Then tighten the adjusting nut while rotating the pushrod until all lash is removed. Now tighten the adjusting nut 1/2 full turn. This "centers" your lifter. After you have adjusted the above valves, rotate you engine 360 degrees bringing the pointer around to the 0 TDC mark. This is TDC #6. Adjust the following valves in the same manner: INTAKE on cylinders 3,4,6,8 EXHAUST on cylinders 2,5,6,7 Your valves are now adjusted properly. good luck and may the force be with you as per the g.m manual.. |
Re: sbc / bbc valve train adjustment
I have used this for years and is the best way. Thanks for posting this, I always have to go to the book.
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Re: sbc / bbc valve train adjustment
WHen you say zero lash which is the same as remove all lash. THat is when you can feel the push rod rotate underneath the rocker and tighten the nut until the push rod just stops the rotation correct?
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Re: sbc / bbc valve train adjustment
Ok assuming I have the right TDC on the compression stroke. I tightend each rocker nut until I felt drag on the pushrod then tightend another half a turn. I am thinking this is what mark is talking about. However Billa once I tightend the extra half turn I could not turn the pushrod anymore. Should I loosen it up again so the pushrod turns? Then when I rotated the engine 360 to finish the rest of the valves the pushrods on #1 cylinder can turn again. Now I am confused?
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What you're doing here is pushing against the spring inside the hydraulic lifter. |
Re: sbc / bbc valve train adjustment
Thanks that cleared up the confusion. Now I have to make sure I had the right TDC. I think I did because both the intake and exhaust valves were closed. If I had been 180 out the exhaust would have been open correct? and should I go past 1/2 turn to 1 full turn?
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Re: sbc / bbc valve train adjustment
Thanks Billa you have been a big help. I have the valves adjusted and right. Now all I need to do is start the engine and see if that fixed my lifter noise.
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Re: sbc / bbc valve train adjustment
im guessing since the firing order is the same for a small block and big block u adjust the same valves on number 1 and 6
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