For the stock sleeves I would honestly go no more than .20 with it bossted. But that is just me. Any further than that , you run the risk of the cylinders turn into an oval shape instead of a circle. We did that to a friends car years ago. Although he was running 18+psi
Thats what I am talking about BigTuna. I thought about the 81mm sleeves over the weekend. To many issues to deal with. Might just go with 78mm instead. I am going to check the stock sleeves and see just how big I could go with the stock ones. I talked to Oscar Jackson (Jackson Racing) a few years ago and he looked at one block I had and he told me I could go 77mm N/A. wish I had that block back.
Just got off the phone (Again) with my friend at ARIAS. with an 80mm piston, I am looking at 3.152". The B series 1.8 bore is 3.19". The stroke on the D15 had more stroke so it will be closer to 1.8 if all measurements are correct. (I think). If I keep it closer to 12:1 comp, I can drive it on the street still. I only live a mile form my shop. But contemplating on raising the roof on compression. Got a fuel station down the street that sells trick