Motor was built by Performance racing engines in plainfield Il. I found all the specs on it.
4.1 S2 block is off/c, 016
4 steel mains (center 2 4-bolt),
wetsump-style (currently tapped & plugged)
lifter bores drilled/tapped/plugged
Bored/TP honed to 3.980
Squared/decked —9.540
Piston oil squirters installed
Crank is BMS forging, narrow journal, 3.400, 0\0 rods/mains (magged 3x/checked/polished)
Rods are new Carrillo 6.5, .990 pin, .850 wide, .100 offset, latest bolts
Pins are Ross tapered PBR-style, 2.750”
Pistons are new Ross 9.0:1, -34cc, dual spirolox, slight flycut, .004 clearance
Rings are new TotalSeal (not zero-gap), 1/16-1/16/3-16, .018 top, .016 2nd (moly, cast)
Main bearings are new BMS, 2.5 clearance
Rod bearings are new Clevite 2.1 to 2.3 clearance
Rotating assembly balanced full internal
Cam is new Reed hyd roller 232/232, .560/.560, 110 l/c, 270 adv
Lifters are Speed Pro hyd rollers,
Rollmaster timing chain
Heads are alum S2, 2.02 SS intake, 1.60 inconel exhaust, med porting, surfaced, multi-angle valve job, new Isky springs,“M” (med lift) T&D style.