Yes it is a stock block I think they have on their website that they can get sleeves that can go as much as a 4.220 bore. I hope it will last it has alot of nice machine work done already I guess I will be the first person to try one in a true race setup I was having trouble finding a R block when I found this one for sell a couple years ago so I bought it.
It also has a half fill of hard block done by them. I am planning on carrying it to Ryan J in the next month or so I know this is the busy time of the year for him so sometime after the first of the year we'll see if it makes it past the dyno or not.
He ported a W2 Pro Dominator tunnelram for me to match the Indy heads. I have a Dominator top for it that I want him to try two C&S Aerosol 1050 Dominators I have against a single plane Indy intake with a Holley 1050 dominator.
If it survives all that on the dyno maybe it will last a little while should be interesting to see.