Break In At Dyno Shop.

Just called a dyno shop near me the other day to ask about this very thing. $395 for break in and $600 + or - for a full dyno session.

I plan to do it, just to have peace of mind when I put the thing in the car. It's lot easier to find/see any leaks. Plus, the dyno operator just sets the throttle at XXXX rpm and watches everything. Probably be a little more difficult to do that effectively with the thing in the car.

Another benefit of break-in on the dyno is not having to worry too much about having the timing set right on first fire up. That prevents a lot of potential cam failures when you eliminate hard starting problems. And don't forget about getting the air out of the cooling system. I'd rather not deal with that on first start up with a performance engine.

Also, if you have a solid flat tappet cam, you generally want to run a single outer spring during break in. How much fun would it be to change the springs with the heads on in the car?