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Mod | | | Forums66 Topics128,049 Posts1,055,680 Members48,426 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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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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