Also, with both dynoes, the owner of the motor has to be willing to "risk" their engine and allow the dyno operator to MAX out the engine's RPM's. If you dyno an engine but only allow it to rev up to 4k RPM's then you are not going to get a true rating because your engine's peak may be at 6500 RPM's.

Your engine builder will always tell you your max RPM, this is where you need to push the engine and get your most accurate ratings.

I've seen guys pay $100 for 3 pulls but tell the operator not to exceed 4k RPM's etc. Well then you might as well keep your $100 and not waste anyone's time. Not too mention you are not going to be happy with the results!

Most Pontiac engines max out realatively low RPM's (5k-6k) whereas a BBC can go up to 7500 or more. My 461 stroker is rated at 5900 RPM's, when I had this motor in the Bird, it was done at no more than 5200 at MOST! But then again, Pontiac engines are known for low RPM and maximum torque. That's what I love about them!!!!!

I have been told over and over again, the biggest HP gain for the dollar is going roller. Roller motors put up the most HP with the least amount of effort. Hence the reason new cars are getting such impressive HP ratings yet lasting 200k miles. Going roller takes a TON of friction off the internals of a motor thus creating more HP.