We're running a 540 BBC on the dyno this week and it isn't going very well. The engine just won't rev past 6000 rpm. It is a hyd roller cam so that is the obvious suspect but it doesn't make any valvetrain noise at 6000 rpm and it has the correct springs in it and plenty of oil pressure. We actually think the problem is due to something weird in the EFI system and/or the intake manifold itself. We're going to switch over to a carb next week to see what happens. This engine has been on the dyno before and last time it acted weird. It has a lot of really good parts but something isn't correct somewhere. Hopefully we can figure it out. Here is a short video showing two dyno pulls back to back:
https://youtu.be/4q-tV1mNl-gEngine is making 730 hp on these pulls so it isn't a slouch, but it should be making more and it should be pulling higher so something is wrong somewhere. Plugs all look good, EGTs are normal, AFR is normal, etc. so no obvious clues.
