coil bind in 350 sbc - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-02-2003, 11:14 PM
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coil bind in 350 sbc

looking 4 an opinion... just installed a 272 h10 crane cam in 350. adj'd lifters to zero lash (am i right in thinking that means the point where u just can't spin pushrod w/ fingers???), then went 1/2 turn more. problem is, exhaust valve springs bind. guy at speed shop told me to back rockers way off and adjust them when its running. the problem is when u start it , your not supposed to drop beliw 1500 rpm, is it possible to adjust lifters @ that rpm???


also n e 1 have experiance w/ 272 crane cam? how'd ya like it?

sorry for long post any replies appriciated thx fin

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Old 07-03-2003, 07:17 AM
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You can not use the rotators on top of the valve springs any longer. They will cause springs to become coil bound. You also should not use the stock springs any longer as they don't allow for the lift you have with that cam. Do NOT start your engine with your present setup.
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Old 07-04-2003, 12:35 AM
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thx 4 the reply, you've told me what not to do (what I was worried about). how should I go about correcting this, new springs?, rotators?.... n e more opinions???? The speed shop said cam was not that large and I needn't worry were they lying??? thx in advance fin
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Old 07-04-2003, 06:53 AM
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The cam manufacturer should have a suggested a spring set for that cam. Use them with NO rotators and the valve caps and keepers that the cam manufacturer suggests.

Be sure to check the valve to piston clearance also before starting your engine.

You also need to use new lifters. Break in the cam as per the manufacturer's suggestion.
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Old 07-05-2003, 08:06 AM
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Frisco hit most of it in his replys.
One other thing to check.
Check the rocker studs, they may be pulling out also.
Get the Crane ploy locks there some of the best for staying tight.
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Old 07-12-2003, 10:29 PM
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why no exhuast rotors, jusy put intake on them all?
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Old 07-12-2003, 10:38 PM
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Quote:
Originally posted by LoudMalibu
why no exhuast rotors, jusy put intake on them all?
what he means is use non rotating retainers they allow for more spring height and are much stronger.
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Old 07-13-2003, 08:26 AM
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BE advised you cannot just take the rotators off and replace them with regular or stock retainers, you will have a seat pressure of about 40 lbs. if that.. Rotators are about .100 thicker than retainers, thus you have to add shims or replace spring to make up the distance, depending on the head model and year the spring on the exhaust may be shorter or the spring pocket is deeper to make up for the difference in installed height. Your speed shop guy was correct in that you should be able to use the stock setup with rotators ,as this is a very mild cam, first you should learn how to correctly adjust the lifters, by reading or watching an experienced person, you have probably compressed the plunger to the botton of the lifter and bottomed out all the adjustment in the valvetrain.
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Old 07-15-2003, 11:25 PM
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hi bob, thx 4 the reply... another guy I know suggested the bottoming out of the lifters to me. He also said that if I backed off rockers and fired it up oil pressure would "pump" up lifters and adjustments could be made then. The only concern I have about this is Crane recommends that u not idle lower than 1500 rpm during break in. Can lifters be adjusted at this speed, or if not I wouldn't have enough pressure on cam to properly break it in?? thx fin
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