2.4l 6bolt Vs. 7 Bolt

[Raptor]

In Carey's motor, the dowel pins are the traditional CRCO bushings. The thrust surfaces were aligned very carefully. As far as assembly, this year we have done 16 fully built engines, almost half 2.4's, all 6 bolts except Chris's. One walked, you do the math. 7bolt + heavy clutch = bad idea. Personally, before this year, I have built well over a hundred various motors from bikes to stroked v8's with not one bearing spun, or assembly issue in any of them. Can anyone else here say that? We are looking into the use of hardened pins as well, the machine shop we use is the best around and if it can be done correctly, they can do it. It could help, but I wouldn't bother without using higher load bearings and a pressure plate that causes less pressure on the thrust surfaces.

Personally, I don't think Shanes motor is in any more danger of walking just due to the twin plate clutch. How many of the fast 7 bolt motors out there are on 2900 6pucks as opposed to twin disk? One of the engines we pulled out of a 2G that was walked and showed up on a trailer was built by a reputable shop with Crowers, JE's and ARPs as well as a 2900 pucked clutch . Go figure I am not sure it made it more than a couple thousand miles either with a lot less demands on it. Question is, how many times does a person have to be hit before they figure out they should duck?