Intake open, Exhaust closed valve lash method - Nova Tech
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Old May 10th, 09, 12:33 AM
74axledragger 74axledragger is offline
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Default Intake open, Exhaust closed valve lash method

Hey can anybody here decribe in detail the Intake open exhaust closed valve lash procedure, i have high volume high pressure oil pump and cannot do it running, thanks guys
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Old May 10th, 09, 12:35 AM
74axledragger 74axledragger is offline
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Default Re: Intake open, Exhaust closed valve lash method

also does anybody have a link or diagram that shows which valve is intake and exhaust on a sbc on the driver and passenger side
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Old May 10th, 09, 12:36 AM
SHIFTY4 SHIFTY4 is offline
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Default Re: Intake open, Exhaust closed valve lash method

i can link it to you easier than explaining if you'd like... check "Calculators, Engine Decoding & Tech Info" at the www.JollyRodder.com website and scroll to the "Valve Adjustment Procedure" link
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Old May 10th, 09, 12:38 AM
SHIFTY4 SHIFTY4 is offline
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Default Re: Intake open, Exhaust closed valve lash method

Quote:
Originally Posted by 74axledragger View Post
also does anybody have a link or diagram that shows which valve is intake and exhaust on a sbc on the driver and passenger side

front to rear whether driver's side or passenger side.

Exhaust, Intake, Intake, Exhaust, Exhaust, Intake, Intake, Exhaust


easy way to tell is to look at the valve's location... it either is located above the exhaust manifold, or below the intake manifold
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Old May 10th, 09, 09:22 AM
o67 o67 is offline
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Default Re: Intake open, Exhaust closed valve lash method

the exaust valve is always next to the exaust port on the heads.when the exaust just starts to open,you adjust the intake valve.when the intake is 1/2 to 2/3s the way down,you adjust the exaust valve.
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Old May 10th, 09, 09:29 AM
onovakind67 onovakind67 is offline
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Default Re: Intake open, Exhaust closed valve lash method

Quote:
Originally Posted by 74axledragger View Post
Hey can anybody here decribe in detail the Intake open exhaust closed valve lash procedure, i have high volume high pressure oil pump and cannot do it running, thanks guys
It's intake closing, exhaust opening.

To adjust valve lash, be it with a hydraulic or mechanical cam, you need to have the lifter on the heel or base circle of the camshaft lobe, and there are a couple of ways to get there. The first is the exhaust opening and intake closing method (EO/IC). Starting with cylinder No. 1 (usually the head that is farthest forward on the block is No. 1, or see our handy charts) with the valve cover off, rotate the engine until the exhaust pushrod begins to move upward. This is the point at which the exhaust valve is opening (EO), meaning the piston is through with the power stroke and nearing BDC, and it's about to begin the exhaust stroke. At this point, the intake valve is closed and the lifter is on the base circle of the camshaft and can be adjusted. To adjust lash with hydraulic lifters, simply grab the pushrod and back off the rocker-arm adjusting nut until you feel lash between the pushrod and the rocker arm. Turn the rocker arm adjusting nut while rotating the pushrod until there is no more play between the pushrod and the rocker arm, then tighten the adjusting nut one half turn. That's it, you're done. To adjust the exhaust lash, turn the engine over until the exhaust valve has completed its lift cycle and the intake valve is closed about three-quarters of the way (IC). Now, the exhaust lifter is on the base circle because the piston is finishing the intake stroke and about to begin compression. Set the lash on the exhaust valve and you're done. This needs to be done for each cylinder. But there is another way.

http://www.carcraft.com/howto/ccrp_0...aft/index.html
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Old May 10th, 09, 09:39 AM
Philip Philip is offline
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Default Re: Intake open, Exhaust closed valve lash method

Mike the Car Craft alternate method works best with a stock or near stock cam. IMO taking the time to do it with more then 2 revolutions of the crank shaft is far better. After spending countless hours and dollars on the engine of your dreams is it worth cutting corners on the last assembly step.
In a lot of engines the valve adjustment will need to be done twice. In my engine the break in was done with the inner springs removed to reduce spring pressure during the flat tappet cam break in period. I performed the task both times in less then 15 minutes.
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