Roller rocker hitting aluminum head???

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Budgetmoparman

Budgetmoparman

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Anyone else ever have an issue with aluminum roller rockers rubbing on the pedestal on Edelbrock aluminum heads? The rockers are 440 source's roller rockers, heads are Edelbrock RPM. Still doing mock up so I only have one head on so far but the rocker for the exhaust on the #7 cylinder is rubbing against the mounting pedestal. The roller is centered on the valve stem so I don't think I should shim it over more. I'm thinking the pedestal should be machined a little more?

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The geometry is totally messed up. Correct that and the clearance issue will probably get fixed with it.
 
Yeah, I see contact at the bottom of the pedestal. Just grind the reqd clearance off the pedestal, looks like very little material needs to be removed.
 
Budgetmoparman said:
Anyone else ever have an issue with aluminum roller rockers rubbing on the pedestal on Edelbrock aluminum heads? The rockers are 440 source's roller rockers, heads are Edelbrock RPM. Still doing mock up so I only have one head on so far but the rocker for the exhaust on the #7 cylinder is rubbing against the mounting pedestal. The roller is centered on the valve stem so I don't think I should shim it over more. I'm thinking the pedestal should be machined a little more?

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There is always going to be some adjustments/modifications that need to be made because of tolerance issues.
I keep saying, "You have got to be smarter than your cylinder heads." You have already discovered the problem and thought of an excellent solution. Said solution has been seconded below.
PRH said:
Good catch.

I’d just knock that little corner off the head.
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Now will come other suggestions, as always happens, beyond what you have asked. If all you want is for that rocker to clear, you already have your answer.
 
IQ52 said:
There is always going to be some adjustments/modifications that need to be made because of tolerance issues.
I keep saying, "You have got to be smarter than your cylinder heads." You have already discovered the problem and thought of an excellent solution. Said solution has been seconded below.

Now will come other suggestions, as always happens, beyond what you have asked. If all you want is for that rocker to clear, you already have your answer.
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Agreed. If this was a prostock motor I guess I would be a bit more picky. This is a street motor that won't see over 6,000rpm ever. I don't think the geometry is going to make or break this motor. I bet you would be hard pressed to find a factory Chrysler motor that had perfect valve train geometry and they ran just fine.
 
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