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Old 06-05-2011, 04:08 PM   #1
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302 heads

He there, I took off some positive stop heads and replaced them with pedestal mount that I converted to adjustable. I'm using the same stamped rockers from the positive stop heads, the problem I'm having is with the left side head, the rocker bottoms out on the valve retainer plate and not on the valve it's self but not on the right side, that one has lost of clearance. Are the valve springs the same between these heads I know the rockers are different and that's why I'm using these rockers. Thanks .
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Old 06-05-2011, 04:36 PM   #2
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Re: 302 heads

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He there, I took off some positive stop heads and replaced them with pedestal mount that I converted to adjustable. I'm using the same stamped rockers from the positive stop heads, the problem I'm having is with the left side head, the rocker bottoms out on the valve retainer plate and not on the valve it's self but not on the right side, that one has lost of clearance. Are the valve springs the same between these heads I know the rockers are different and that's why I'm using these rockers. Thanks .
Can you get a picture of the issue?
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Old 06-05-2011, 09:50 PM   #3
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Re: 302 heads

Sounds like some shims are missing...

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Old 06-05-2011, 10:02 PM   #4
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As you can see the one rocker is right on the retainer and the other one has clearance. I looks like it's just the intake valves. When you say shims is that the cap that comes off the valve?
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Old 06-05-2011, 10:10 PM   #5
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Re: 302 heads

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As you can see the one rocker is right on the retainer and the other one has clearance. I looks like it's just the intake valves. When you say shims is that the cap that comes off the valve?
Why are the tops of the valves new and shiny looking one one side and dull, dirty looking in the other?

Are there different keepers being used?

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Old 06-05-2011, 10:23 PM   #6
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I'm not sure what you are seeing, shunning and dull? Nothing is dirty or rusty their is oil on everything tho. No I'm not using different keepers.
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Old 06-05-2011, 10:28 PM   #7
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Re: 302 heads

I know there is a "bump" in the end of the rocker arms that is supposed to sit on the tip of the valve. Are the rocker arms not quit long enough, and those bumps are slightly behind/beside the valve tip.....allowing the RA to straddle?

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Old 06-05-2011, 10:40 PM   #8
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Yeah when the cam is at base circle on valve train in question the rocker will rest ont the retainer and the "bump" is not on the valve, but only on the intake valve's. The exhaust valve is raised up higher above the retainer is that normal?
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Old 06-05-2011, 10:42 PM   #9
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Re: 302 heads

You said you changed heads, right? Are you sure they don't require different rocker arms? It looks like you may need slightly longer ones.......or maybe shimming them up would reduce the angle, and they would sit as they're supposed to?

I'm not positive, but two options...

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Old 06-05-2011, 10:52 PM   #10
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I don't know if I'm using the right rockers, they came off my positive stop heads, the heads I'm using know are pedestal mount with studs installed for adjustable rockers.
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Old 06-05-2011, 11:34 PM   #11
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Re: 302 heads

The rockers will work.

You appear to have an issue with the pushrod length on the intake side.
I believe they are to short.
You should remove one intake and one exhaust pushrod.
Check the intake pushrod length against the exhaust pushrod length.

If the intake pushrods are shorter, then replace them with the same length as the exhaust pushrods.
If they are not shorter then increase your intake pushrod length by .100" and see if that doesn't get you the clearance you need.

Also check the fulcrum contact point of the rocker arm on the valve tip. You want it centered on the valve tip which may require some special length pushrods and/or possibly valve lash tips on the valve stems.

It just occured to me, were there valve lash tips on the valves before?
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Old 06-06-2011, 12:43 AM   #12
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All the pushrods are the same length, the weird part is this problem is only on the drivers side cyl head the pass side is fine. And yes the caps were on the valve tips. Could it be a problem with springs or valve stems?
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Old 06-11-2011, 05:22 PM   #13
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Were the heads decked or milled to be flat. Could be a variance from one side to the other.
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Old 06-11-2011, 10:38 PM   #14
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Re: 302 heads

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All the pushrods are the same length, the weird part is this problem is only on the drivers side cyl head the pass side is fine. And yes the caps were on the valve tips. Could it be a problem with springs or valve stems?
Sounds like your valve stem height is off.
Maybe they ground the stems down too much or do not have the correct lash caps on them?
I think I would pull the head(s) and disassemble it/them for a closer inspection of the components.
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Old 06-12-2011, 12:23 AM   #15
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Thanks for all you help guys it turns out that the valve keepers were worn right our and allowing the valve to collapse. I replaced them and problem solved.
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Old 06-12-2011, 01:50 AM   #16
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Re: 302 heads

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Thanks for all you help guys it turns out that the valve keepers were worn right our and allowing the valve to collapse. I replaced them and problem solved.
We were getting close!
Glad you found the problem and got it fixed.
That could have been disastrous if they dropped a valve under power.
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