I met with Richard Maskin a couple of years ago and dicussed the possibility of producing a block. It was going to be a 2 year/$250,000 dollar project doing it with Dart. I didn't consider it a viable business proposition.
I've been trying to get in contact with Kent Ritter regarding his XR blocks. They look like they are the key to a big cubic inch P5 style motor.
I would love to build a 440-450ci motor to see what it is capable of!
P.S. I have 5 R4/P5 blocks and last I knew there were about 10 in stock at Chrysler/Michigan. Maybe Zippy can update us.
You would struggle getting anything bigger than a 3.625" stroke in the R4 block though. A 4.225" bore hasn't been an issue so far!
When Rick Liuzzo was involved with those blocks, he did tell me ordering them with un-machined lifter bores and deck was possible at the time, but they had not tried a P5 head onto them. This was a few years ago and Kent might have looked into this by now.
