Thread: Roller Rocker Lash Question, Pat,Eric, Dave

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I sat the lash on the 396 today and after turning the engine over to #6 TDC and running the lash out on that side, I notice alot of free movement on a couple of the rockers that I had sat while running the #1 TDC side. . Is it normal to have alot of slop in the rocker on one side while adjusting the others?

V8-267, 305 & 350 (CHEVROLET BUILT)

Initial Adjustment



Rotate crankshaft until mark on torsional damper aligns with center or ``O'' mark on timing tab, attached to crankcase front cover, and piston of No. 1 cylinder is at top dead center of compression stroke. This may be determined by placing fingers on the valves for No. 1 cylinder as timing mark on damper nears the ``O'' mark on front cover. If valves do not move, engine is in the No. 1 firing position. If valves move, the engine is in the No. 6 firing position and should be rotated an additional revolution.
With valves in No. 1 firing position, adjust exhaust valves 1, 3, 4 and 8, and intake valves 1, 2, 5 and 7 as described in step 3.
Back out adjusting nut until lash is felt at pushrod, then turn adjusting nut inward until all lash is removed. When all lash has been removed, turn adjusting nut in additional number of turns specified in Tune Up Specifications Chart.Zero lash can be determined by rotating pushrod while turning and adjusting nut.
Rotate crankshaft one revolution, until pointer ``O'' mark and torsional damper mark are aligned. With engine in this position, adjust exhaust valves 2, 5, 6 and 7 and intake valves 3, 4, 6 and 8.
Install rocker arm covers, then start engine and check idle speed and ignition timing.

Randy, No offense, but I don't use that method any more. It works fine for mild cams, but it can cause adjustment problems with others.

Jimmy, you're getting slop because the lifters aren't pumped up.

I set the rockers one-by-one.

- Remove the spark plugs - it makes the engine easier to turn over.
- Loosen all the adjustment nuts.
- Turn the engine over until an exhaust valve pushrood starts to move up, then set the intake.
- Turn the engine over until the intake valve you just set is nearly closed, then set the exhaust valve.

- Repeat seven more times.

It's a lot of engine turning, but it guarantees an accurate lash.

This is a good link.

Originally Posted by Henry Rifle

Randy, No offense, but I don't use that method any more. It works fine for mild cams, but it can cause adjustment problems with others.

Jimmy, you're getting slop because the lifters aren't pumped up.

I set the rockers one-by-one.

- Remove the spark plugs - it makes the engine easier to turn over.
- Loosen all the adjustment nuts.
- Turn the engine over until an exhaust valve pushrood starts to move up, then set the intake.
- Turn the engine over until the intake valve you just set is nearly closed, then set the exhaust valve.

- Repeat seven more times.

It's a lot of engine turning, but it guarantees an accurate lash.

This is a good link.

Read what Jack says here.
This I.M.O. is the only way to set them correctly.

Originally Posted by erik erikson

Read what Jack says here.
This I.M.O. is the only way to set them correctly.

i set them somewhat like this allways and never ever had any problems

Are you running hydraulic or solid lifters...???? I set them like Jack does, takes a bit longer but it's always worked better for me.....