I'm in the process of switching from a 10 inch to a 10.5 inch clutch and bellhousing because I ran a 10 inch with the 273 bellhousing for years. I found out at the end of 2011 that the 10 inch pressure plate has a cast ring and under heavy load (drag strip TNT) that the cast ring will fracture or crack. I was told that the ring needs to be forged steel and that is why mine cracked. I'm currently running a 340 engine putting out more than 400 horse and have seen past postings of the 10.5 clutch and bellhousing solving all problems. What issues has anybody seen with converting from a 10 inch to a 10.5 inch clutch and larger bellhousing (ie; clearence, modifications, starter location)
