Comments on my 340 plug under mag

You can’t do it on a chassis dyno, or any inertia dyno.

You have to be able to load the engine and hold it there.

I charge by the day and it’s a two day charge if I have to develop a timing curve. I might get it done in one day if I do t have to break in a cam, drop in inner springs and break in the pistons.

It’s definitely two days if have to do all that.

And that’s not accounting for oil leaks and other issues that crop up on the dyno.