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Old 7th-January-2017, 02:35 PM   #1
kimrobertson
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Bad News

Going back 5 years when I built my engine I really didn't know what I was doing with setting the valve lash. Consequently at first startup the valves were way too tight.

Over the past 5 years I have been bothered by a ticking noise form the valve train. I was hoping maybe just caused by the old 1978 pushrods and rockers. Engine seemed to run fine with good power. Just that annoying tick that wasn't real loud but annoying--and no amount of adjusting would make it go away.

I have had new push rods and rockers for about 8 months and finally got them in this morning with my brother's help.



The noise is now actually worse! When taking the old ones out we had found several bent push rods... probably from the initial startups because they were all straight when I originally installed 5 yrs ago. Next step will be to do a compression test and see where everything stands. If that looks okay I will pull the intake and check the lifters...and cam ( if I can see enough of it).
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Old 9th-January-2017, 10:51 AM   #2
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Was the cam matched to the springs? Is there a chance you had any coil bind going?
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Old 9th-January-2017, 11:27 AM   #3
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Was the cam matched to the springs? Is there a chance you had any coil bind going?

Not sure what coil bind is...Is that when the valve springs can't handle the lift or float because the can't handle the rpm?

Cam is Comp Cams XE 268 12-242-2 Valve springs were new .550 lift "Z28" springs. Specs in link...

http://www.compcams.com/Company/CC/c...x?csid=86&sb=2
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Old 9th-January-2017, 11:33 AM   #4
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Coil bind is when the spring cannot compress anymore and the pushrod is still trying. Are you using the stock length pushrods?
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Old 9th-January-2017, 11:37 AM   #5
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Did you see the note that stock springs cannot be used?
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Old 9th-January-2017, 01:04 PM   #6
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Okay--The springs are good to .55 lift and the cam is .48...I remember now asking about the stock spring note when I was considering buying the cam and they said the springs in my heads would work fine.
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Old 9th-January-2017, 01:11 PM   #7
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I have been using the Z28 springs for a 10 years now in my 355 with the comp xe268 running her up to 6000 rpm occasionally and zero issues.
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Old 9th-January-2017, 05:42 PM   #8
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Good. I was worried about too much lift for the spring.
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Old 9th-January-2017, 06:59 PM   #9
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Are you useing cast iron heads? Were the valve guides checked for exsessive wear? If they are worn they will tick. It will sound like a lifter tick and at cam speed.
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Old 9th-January-2017, 09:58 PM   #10
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The heads are cast iron but were reconditioned when I put it together. New guides, seats, seals, valves...3 angle valve job... I'm thinking that my overtightening the valves originally damaged the cam before I got them loosened up and adjusted properly so I could never get rid of the noise It wasn't a terrible noise but just not right. So I was hoping the new parts would take care of the problem...

What I'm a little confused about is why new pushrods and rockers adjusted properly would result in the same noise only louder. Maybe the cam & lifters worn the wrong way somehow is affecting the new parts?
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Old 9th-January-2017, 11:57 PM   #11
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Try thicker oil. Maybe the lifters are bleeding down too fast and behaving like rhoads lifters.
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Old 10th-January-2017, 08:11 AM   #12
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Blown exhaust manifold gasket will cause a tick.
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Old 10th-January-2017, 09:15 AM   #13
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Could be lots of things. I've seen a broken piston skirt sound just like a loose rocker.

As far as setting your valves, if you don't know how then learn/ask and don't guess. Not bashing at all, but really serious about this. Don't only learn the how, but the why also.
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Old 10th-January-2017, 10:37 AM   #14
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Try thicker oil. Maybe the lifters are bleeding down too fast and behaving like rhoads lifters.
Running 20-50 since rebuilt 5 years ago...Actually am thinking of running lighter weight after I get this straightened out.
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Old 10th-January-2017, 10:38 AM   #15
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Blown exhaust manifold gasket will cause a tick.
Yes I'm aware of that but this is definitely internal...
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