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GM 4.2 inline 6 cylinder head
I am working on an 07 Envoy that has a P0300 due to a leaking intake valve on cyl. 6. (similar problem as prior years) The cylinder head is being replaced. I found in SI that the replacement head has a larger threaded hole for the upper left timing chain guide... Login to read more. 
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| Engine | 4.2 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2007 GMC Envoy SLE 4.2L
| Engine | 4.2 L |
| Trans | 4-speed Automatic (Electronic) |
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