340 camshaft break-in. Well.....almost

Bring it up to 2000 RPM minimum as soon as it fires, if something happens it's fine to shut 'er down before the 20 minutes is up just make sure on the restart it comes right back up to 2000+ RPM again. First time I did a cam break in I wasn't aware the block had to be pre-filled with coolant before installing the thermostat; thing overheated right quick and I probably messed up the bottom end but this was a stock worn-out 318 with a cam swap. Still put about 10k miles on it afterwards until the oil burning just got to be too much (rings and bores were toast).

Make sure it has plenty of ignition advance, it's under no load so it needs it or else it'll run hot and dump extra heat out the exhaust. Wouldn't hurt to hook up a vacuum gauge and tune the idle mixture screws a bit too, at that RPM with no load the carb will still be running mostly on the idle circuits and you really don't want it to be too lean. Just my 2 pennies...

EDIT: FYI that cam I broke in in that 318 I took out with all the lifters categorized to the correct lobes and reinstalled in a 360 and put another 25k miles on it. It was a Lunati Voodoo HFT.