427 rocker/retainer problems - Team Camaro Tech
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post #1 of 6 (permalink) Old Nov 9th, 05, 04:11 PM Thread Starter
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Joe
 
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427 rocker/retainer problems

Help!!!!! My 427 that I bought on e-bay arrived today, to replace my tired 396. Supposedly rebuilt by a professional machine shop, I popped a cover and took a look inside. It appears that the roller rocker is just touching the edge on the retainer on a few cylinders, and the tip of the roller is not on the valve stem yet. It is a comp cams roller cam, comp cams 1.7 roller rockers, and merlin heads. Is this because the push rod length is wrong? Or is the spring height wrong? Or is it something else???? I have never had to deal with rocker arm geometry before, so I dont know how to proceed. Joe
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post #2 of 6 (permalink) Old Nov 9th, 05, 04:23 PM
 
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Re: 427 rocker/retainer problems

If it has stock dia. springs on it then the push rod is to short.
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post #3 of 6 (permalink) Old Nov 9th, 05, 05:12 PM Thread Starter
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Re: 427 rocker/retainer problems

How can I tell if the springs are stock diameter?
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post #4 of 6 (permalink) Old Nov 9th, 05, 06:20 PM
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Re: 427 rocker/retainer problems

"how to proceed" ? .... call the "professional builder"

Seriously, either the pushrod length is off or the rockers are older ones that are not releived enough for large springs. Has the engine been run at all ? If so, what does the contact pattern on the top of the valve look like ?

Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner


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post #5 of 6 (permalink) Old Nov 9th, 05, 07:44 PM Thread Starter
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Re: 427 rocker/retainer problems

the problem is the builder (with a 1 year warranty) is in Minnesota, and I am in Virginia.....so the warranty means squat to me I guess....unless I want to pay shipping both ways. I will start trying to muddle through it and figure it out, with help from you guys on this board I hope......Joe
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post #6 of 6 (permalink) Old Nov 9th, 05, 10:09 PM
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Steve
 
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Re: 427 rocker/retainer problems

Stock diameter springs are about 1.47" (or something like that!), and most aftermarket performance heads have 1.55" dia springs.
Basically, any quality roller rocker (such as your CCs) will clear at least these dia springs.
Have a look at a valve that is at about 1/2 lift. Is the rocker tip on the centerline of the valvestem? If not, it should be.. and the right length pushrods will be required to do this.

It's possible your pushrods are the "correct" stock length, but things such as longer than stock valve stems, heads and/or deck milling, reseated valves, small cam base circle, or a combination of all these will make your pushrods "incorrect".

I have 1.625" dia springs on mine with CC rockers and no clearance issues.

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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