I spoke to Ken at Oregon Cam Grinders and made the purchase for my 70 340 stick car. Ended up playing with the preload on my adjustable rockers and screwed up a couple of lifters. Sent the cam back to Ken to have him make sure it was not damaged. I ended up buying a second one from him identical to the first just to have one on the shelf. Got a nice sound at idle and the car is running better than it did for the first 6 years I've owned it. Still haven't changed the 741 center section back into the 8 3/4 with the factory 3.91's. That will happen before I put her away for the winter.