rocker arm bolt hole stripped

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May 19, 2010 | 09:53 AM

95formula

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From: Topeka KS

rocker arm bolt hole stripped

Started the z06 up last night and backed it out of the garage. I could tell it was missing. Pulled back in and pulled the valve covers to check the springs. Cylinder #1 intake rocker arm was loose. The bolt hole has been stripped.

I assume that it can be helicoiled (sp). Anyone know what size of helicoil I need?

Has anyone else experienced this?

Thanks

May 19, 2010 | 12:08 PM

lucky131969

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From: Dyer, IN

Quote:

Originally Posted by 95formula

Is this a stock valve train, or has work been done i.e. heads, springs, rockers, etc. ?

May 19, 2010 | 12:41 PM

95formula

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From: Topeka KS

Quote:

Originally Posted by lucky131969

Is this a stock valve train, or has work been done i.e. heads, springs, rockers, etc. ?

Heads and rockers are stock. Camshaft and springs were installed by 21st Century Muscle Cars before I bought the car. Camshaft specs are 224/224 .568"/.568".

Thanks

May 19, 2010 | 12:57 PM

dgrant3830

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From: Van Buren Arkansas

Wounded Warrior Escort '11

Those bolt holes don't strip themselves. Not sure if the head/cam place caused it or they weren't torqued properly. You'll need to see a machine shop now for the helicoil and sizes and it might be needed to remove the head. Make some phone calls to machine shops.

May 19, 2010 | 12:58 PM

lucky131969

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From: Dyer, IN

Quote:

Originally Posted by 95formula

Heads and rockers are stock. Camshaft and springs were installed by 21st Century Muscle Cars before I bought the car. Camshaft specs are 224/224 .568"/.568".

Thanks

Most likely overtorqued, or the installer torque down the rockers on an open valve. Below is the cylinder head thread repair. I can email you the whole engine thread repair section if you want it.