chevy 230 L6 Valve adjustment - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-15-2009, 10:57 PM
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chevy 230 L6 Valve adjustment

Hey does anybody know the valve adjustment procedure for a 230 L6? Thanks.
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Old 07-15-2009, 11:19 PM
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230 L6 Chevrolet.

On #1 adjust the following, INT, 1,2,4. EX, 1,3,5.
Roll it clockwise to #6, adjust the following, INT, 3,5,6. EX, 2,4,6.

To adjust,run rocker nut to ZERO lash, then go 3/4 turn to preload lifter.
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Old 07-15-2009, 11:43 PM
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Assuming this is a fresh motor that you have just assembled, proceed thusly:

Remove the spark plugs so the motor will be easier to turn over by hand. Have a buddy hold his thumb over the spark plug hole on #1 (front) spark plug hole while you turn the crank with a ratchet and long handle affixed to the harmonic damper retaining bolt on the front of the crankshaft. As soon as your buddy begins to feel air pressure on his thumb, you should watch the harmonic damper TDC notch and bring the crank up to TDC, matching the TDC notch on the damper ring with the 0 mark on the timing tab at the front cover.

With #1 at TDC, slightly loosen both intake and exhaust rocker arm adjusting nuts until the rockers are free to move a little. Have your buddy hold the tip of the rocker arm down against the valve stem tip while you grasp the pushrod with your thumb and forefinger. Jiggle the pushrod up and down and slowly tighten the rocker nut until all play is removed and you can no longer jiggle the pushrod up and down. Tighten the adjusting nut down another 1/2 to 3/4 of a turn to set preload. Do both the intake and exhaust on #1 at this time.

Make 3 marks on the damper or crank pulley. Use either a black felt tip pen or stick a piece of tape on, whichever works better. Put a mark at 12:00 O'Clock, 4:00 O'Clock and 8:00 O'Clock as you are looking at the motor from the front.

Turn the crank clockwise 120 degrees (1/3 of a turn) so that the 8:00 O'Clock mark on the damper/pulley comes up to 12:00 O'Clock. Loosen both intake and exhaust adjusting nuts, jiggle the pushrods and adjust both intake and exhaust valves on #5 cylinder (5th from the front).

Turn the crank clockwise 120 degrees so that the next marker on the crank comes up to 12:00 O'Clock. Same routine on #3 cylinder (3rd from front).

Turn the crank clockwise 120 degrees and adjust #6 cylinder (rear cylinder).

Turn the crank clockwise and adjust #2 cylinder (2nd from front).

Turn the crank clockwise and adjust #4 cylinder (4th from front)

There, all done with the static setting. Now, once you fire the motor and get it up to temperature, back off each adjusting nut until the rocker clacks, then tighten the nut until the noise disappears, then give it another 1/2 to 3/4 turn. Bolt the valve cover back on and find something else to occupy your time.
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Old 11-09-2010, 04:53 PM
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valve setting

sorry for kicking a dead horse,but i have 1965 230-6.i dont have a crank bolt.so how are you turning the engine over..?
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