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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | Getting more rocker noise and would like to adjust my clearances. Truck is a 1949 COE and removing the valve cover requires jacking up the cab (long story so I wont get into it here) which makes a hot adjustment virtually impossible.
So my question is;; what do I set my valveclearances for on a cold 248 cu GMC engine? | | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | I usually see guys say about 2 thousands more than the hot.
Give me ambiguity
or give me something else
| | | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | Sounds like a logical number. Thank you | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Most people do not stop to realize that the rocker is wider then the valve stem. This makes the rocker only wears at the contact point. If you simply insert a feeler gauge between the valve and rocker the feeler gauge will bridge the wear point and give you a false reading. Unless you know the rockers are not worn you should check for wear and reface each rocker if worn if you want quiet results.
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