Technically, the oil pump is rated to 7,200 RPM. Thus, I’d put the ultimate redline at 7,000. Coincidentally, that’s the hard RPM limit set in the ignition - in case it revs up for some reason. However, it’s probably not ever going to see more than 6,800. We want it to last for years to come, like the builder’s own motor. His is now in its eighth season of (regular) drag racing without ever touching the bottom end. For the first run, we were shooting for 5,000-5,500 because it’s nice to be gentle on a new engine. I also deliberately set it up somewhat rich (12/1 AFR). We’ll slowly build up towards 6,500 and see how it goes. This beast really doesn’t start to breath right until about 5k. It’s a notably wicked cam.
- dad