Pro Mag valve lash
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TECH Enthusiast
Joined: Jun 2006
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From: Enid, OK
Pro Mag valve lash Z has a Lt1 in it. The engine hasst been started in 3 weeks and im buttoning up a cam install. Im setting the pre load for the valve train with the Pro Mag rockers from comp. They say to tighten until the push rod has resitance then add another 1/2 turn and tighten the lock. Now the lifters are bleed down and im thinking that when the lifter pumps back up with oil its gonna hold the valve open. Am I wrong? Should I go back and only tighten 1/4 turn?
Alot of people have issues with valve adjustment because they do not pump up the lifters before adjusting the rockers. I always have the plugs out, and take the rockers off of the stud. Then turn the motor over until I see oil coming out of the pushrod tip. Then I install and adjust the rockers one at a time in sequence. Never failed me yet. I also use 1/2 turn past a little resistance.
Alot of people have issues with valve adjustment because they do not pump up the lifters before adjusting the rockers. I always have the plugs out, and take the rockers off of the stud. Then turn the motor over until I see oil coming out of the pushrod tip. Then I install and adjust the rockers one at a time in sequence. Never failed me yet. I also use 1/2 turn past a little resistance.
i turn my engine over afew times to make sure the lifters have oil in them so that when you set valve lash there all where there supposed to be I actually went a full turn this time with the promags. I'll let you know Monday when I try to fire it if they ended up being too tight. I think I mashed two due to spinning the thing higher than I should have been.
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I'd just go by there recommendations so the car can be started. Once the car is startable do a dynamic lashing. set all to 1/4 or 1/2 Turn. Call it a day. Make sure those allen set screws are tight. Dynamic is a lot more accurate. Loosen poly till clacking. Tighten (i use fingers for precise control) until quiet. Set preload. Hold poly then get that set screw tight. Done. Move on to next rocker.
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I'd just go by there recommendations so the car can be started. Once the car is startable do a dynamic lashing. set all to 1/4 or 1/2 Turn. Call it a day. Make sure those allen set screws are tight. Dynamic is a lot more accurate. Loosen poly till clacking. Tighten (i use fingers for precise control) until quiet. Set preload. Hold poly then get that set screw tight. Done. Move on to next rocker.
I agree!!
FWIW, ARP says to tighten the set screws on their poly locks to 22 ft/lbs.
Not sure what you're trying to find out...All polylocks are pretty much the same diameter down the shank, and they seat on the trunion of the rocker arm. The only difference, especially when talking about the ARPs, is the size of the hex where you place the wrench. The APRs have a 9/16" hex, and most of the others are 5/8".
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Joined: Dec 2004
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From: fort campbell
re i fyou go to comp cams website you can find it here
http://www.compcams.com/technical/Ca...106-07/276.pdf
http://www.compcams.com/technical/Ca...106-07/276.pdf
