ATK Engines SP52NB Chevy 377 Stroker Short Block, 3.7cc Flat

Reusing a good set of cylinder heads is the point of the ATK SP52NB short block. It supplies a new American-made, 1-piece-seal Chevy block, with Scat handling the spin parts: a nodular-iron crankshaft and forged connecting rods, both riding on ARP 8740 bolts, finished with forged flat-top pistons dished only 3.7cc, so the bottom end is ready and your current heads bolt straight on. Who this short block suits Those near-flat pistons push static compression noticeably higher than a dished piston at the same chamber size, running roughly 10.5:1 up to 12.1:1 depending on the head you install, varying with deck height and gasket thickness. That puts this ahead of ATK's dished-piston 377 short block for a buyer chasing more compression with heads already on hand. What comes with it Factory hands set and seal the freeze plugs and oil galley plugs here, while the cam bearings are already clocked to spec. Heads, camshaft, intake, oil pan, and timing cover are not part of a short block and must be sourced separately. The externally balanced 168-tooth flexplate or flywheel pattern matches the Scat rotating kit used here. Common questions Can I bolt my current heads onto this? That is the intent of this short block; check your head's chamber volume against the compression figures above. What oil does the break-in call for? ATK specifies non-synthetic 10W30 for roughly the first 3,000 miles of use. Is the block the same as ATK's other 377 short block? It uses the same American-made casting, but with flat-top pistons instead of a dish. California requires BAR compliance for engine swap installations.