ATK Engines SP97-B Chrysler Hemi, 392 Stroker Short Block, Boost

The ATK SP97-B is a short block built on the Gen III Hemi 392 stroker combination: a 3.927 in. bore and 4.050 in. stroke on a 2003-2008 Hemi block fitted with ARP main studs. A Scat 4340 forged, internally balanced crank turns Scat 4340 forged H-beam rods at 6.125 in. with ARP 2000 bolts, under forged flat-top pistons dished 2cc. Who this short block suits This one is built with boost or nitrous in mind rather than a naturally aspirated street combination: the ring pack uses a plasma-moly set with a steel top ring gapped specifically for forced induction or nitrous use. Compression runs from roughly 9.1:1 to 9.8:1 depending on the combustion chamber volume of the heads you choose. What to check before you buy Here, too, factory hands set the cam bearings to spec, and the oil galley plugs come sealed from the factory, with a head gasket clearance of .028 in. or to your application. Heads, camshaft, intake, and ignition are not part of a short block; plan those separately for your Hemi build. Internal engine balance is used here, so match your balancer and flexplate or flywheel accordingly. Common questions Is this a complete engine? No, it is a short block: block, crank, rods, and pistons only. What break-in oil does ATK specify? A non-synthetic 5W20 for roughly the first 3,000 miles. Is this a street cam? No, the ring package here is specifically set up for boosted or nitrous use.