[RT]

I've seen (and used) more than a few procedures for adjusting valves, but the one that seems to get the least amount of attention is this one:

It seems rather simple, but thinking about it, if the camshaft is rotated a quarter turn for two revolutions and every rocker arm nut is turned down to zero lash each turn, eventually all valves are set to zero lash with none ever becoming too tight or too loose. Then, it's just a matter of adding pre-load to every one.
I'm curious to hear from professional engine builders. Is there any reason to not use this method?
Thanks,
Rich

 

[69-CHVL]

Amazes me how people struggle with finding zero lash. With polylocks, lightly run them down till they stop. DONE - no wiggling, spinning pushrods etc

 

[Peewee0413]

I tried this method two engines ago. Lost confidence and started over. You save a few minutes on a build, do what you want.

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[Peewee0413]

Amazes me how people struggle with finding zero lash. With polylocks, lightly run them down till they stop. DONE - no wiggling, spinning pushrods etc

I Love polylock lashing.

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[BlueSS454]

Set it on number 1 TDC. Set half the valves. Rotate it one full turn and do the rest. Done.

 

[dyno jonn]

Set it on number 1 TDC. Set half the valves. Rotate it one full turn and do the rest. Done.

Set it on number 1 TDC, adjust all valves. Rotate one turn to TDC, adjust all of the loose ones. Go on break .

 

[billdini]

Set it on number 1 TDC, adjust all valves. Rotate one turn to TDC, adjust all of the loose ones. Go on break .

If it is this easy why has everyone I know, every book that I have read never said this. I am talking going back to the 60's with Chilton's, remember!

 

[dyno jonn]

If it is this easy why has everyone I know, every book that I have read never said this. I am talking going back to the 60's with Chilton's, remember!

Ever adjust valves on a Pontiac V8 326, 350, 389, 400, 421, 428, 455? You don't even need to find TDC. Just crank em down to the stop. Mopar shaft rockers are even easier. Everything doesn't have to be a big production.

 

[billdini]

Ever adjust valves on a Pontiac V8 326, 350, 389, 400, 421, 428, 455? You don't even need to find TDC. Just crank em down. Mopar shaft rockers are even easier. Everything doesn't have to be a big production.

The lash is built into the rail mount system on those cars. Chevy's as you know are individually adjustable. Not to mention non adjustable rail mount systems have there own challenges when stuff starts to wear. I mean if half the lifters are all on the base circle and the others are pushing the lifters sure but I have never seen a cam with half the lobes pointing up and the other half pointing down that would definitely support adjusting your method. I have seen your post and you do know your stuff but this one got my curiosity going.

 

[dyno jonn]

All systems have their own inherit shortcomings. Years ago, I had a little old lady with a Pontiac daily driver complaining of engine noise. She only drove a couple of thousand miles a year, so expensive major repairs weren't in the cards. The car had one cam lobe that was wearing, so even after replacing that lifter, it still clattered. Since the rockers aren't adjustable in the normal sense, I dropped a washer on top of that one rocker ball to push the arm down just a little to take up the slack. She was happy. I has a pleased customer. Daily driver hydraulic lifter adjustment is a lot more forgiving than in solid lifter cars. Every job doesn't have to be a flat rate special. Every job doesn't require race car precision. A good mechanic knows and understands the difference.