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Old 07-08-2002, 07:14 AM
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Exclamation need help asap on cam/pushrods

ok, i have a crane cam in my sbc 400 .447 gross lift/291 duration. is a 5.5" pushrod (stock) acceptable? i think it is, just not sure. i don't have guideplates, but it's not going to be runnin really high rpm's. <img src="confused.gif" border="0">

[ July 08, 2002: Message edited by: Joe_Alan216 ]</p>

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Old 07-08-2002, 09:51 PM
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As long as they are perfectly straight and not excessively worn they will work just fine, do a check of your valvetrain geometry just to be on the safe side. What you will be checking for is if the rocker stays on the valve stem thoughout the cam lift, it should not run off either end.
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Old 07-09-2002, 05:34 AM
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thanks, chuck.
also, when do i tighten down the rockers? when the lifter sits all the way down in the guide?
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Old 07-09-2002, 07:03 AM
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Adjust your rockers when they are on the base circle of the cam. What I do is adjust the exhaust valve when the intake valve is just opening, then I adjust the exhaust valve when the intake is finished closing. Do this on the compression stroke. You can zero lash the rockers or adjust them to the factory preload, zero lash can be found when you can't rotate the pushrod easily when tightening the rockers down. Many people prefer to preload the lifter as per factory specs to get the lifter into it's proper operating position but I have had no problem with zero lash on any engine with adjustable rockers. You will need locking stud nuts mind you, the double nut method is not advisable because it stresses the stud although I have done it in the past with no problems.
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Old 07-09-2002, 12:10 PM
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ok, so let me just get this straight. when the lifters sit all the way down, tighten until pushrod barely drags when you twist it. then turn 1/2 turn more (as is suggested). then i start the motor for a few mins. and double check it, right?
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Old 07-10-2002, 04:45 PM
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before running the motor check one thing first. prime the oil pump. clean off the top of the valve where the rocker rubs. take a black permanent marker and color it in. tighten the rockers. this will tell you if your pushrods are right. it will rub off a line of it and it should be dead nuts in the middle of the valve. if its to low on the valve pushrod is to tall to highj the rods to short.
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