410 CI & It is 9:1 Compression. This is the motor that I built for my Twin Turbo 67 Dart project that I sold minus the motor & trans. It has custom Weisco Pistons with the top ring lan down on the piston with extra meat, ready for NOS, Boost whatever! Tool Steel piston pins, Scat Forged Crank, Scat H Beams. Cam is a Solid Roller for boost, custom grind by Brian at IMM. .643 lift at the valve, .242@50 duration. Cometic Head gaskets, Heads are Studed and torqued to 105lbs. Line honed mains & main caps are studded as well. Cam tunnel was line honed too. With line honing the cam tunnel it made such a huge difference in how easy the motor spins it is crazy. I will always have this done from now on. Oiling mods done to the pump and passages.
Indy RHS X Heads done by Brian at IMM. He did a little bit of clean up and some more tricks on the exhaust side to let the exhaust gasses escape.
It should be able to handle 20psi pretty easily.
It will be on e85, meth injection and air to water intercooler with circulating pump.