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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#20072 08/04/2004 2:02 AM | Joined: Feb 2004 Posts: 110 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2004 Posts: 110 | Cranked my 400 today. With the valves already set and all fluids up to level, It took only one squirt of gas in the carb to bring the fuel up to the carburator (I have a clear fuel filter in line just before the carb) and it ran sweet. I ran it for about 15 minutes but the temp came up too much, so I cut it off and put a 2 1/2 inch spacer between the pump and fan and ran it for about 20 more minutes at a fast idle, maybe about 1200 rpm. Would this be long enough to seat in the cam to lifters? Oil pressure was fine but temp was a little high. I haven't put the extensions on for my shroud yet, but I will before I crank it again. I also used a special assembly grease on the cam and lifters, so I hope everything seated okay. Anybody have any suggestions on more pre-run time for the cam?
Truck Tinker | | |
#20073 08/04/2004 2:54 AM | Joined: Feb 2004 Posts: 29,869 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,869 | You're probably in good shape already. I usually try for 20 to 30 minutes at 2,000 RPM for cam/lifter break in. The first few minutes are the most critical, as the cam needs lots of lubrication from the oil being thrown off the crankshaft. The high idle speed helps flood the cam in oil thrown off the crank and rods. It might be a good idea to re-run the valve adjustment before you button everything up for good.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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