A 377 cubic inch Small Block Chevy short block built on a new one-piece rear main seal block, aimed at builders who want stroker displacement without sourcing and assembling a rotating kit themselves. The dished forged piston keeps compression at a pump gas friendly level across common chamber sizes, so the head choice stays open.

ATK Engines SP35NB 377 Stroker Short Block Features:

• New cast iron block with a one-piece rear main seal.
• 4 in. bore and 3.750 in. stroke for 377 cubic inches.
• Scat 4340 forged crankshaft, externally balanced at the rear and internally balanced at the front.
• Scat 4340 forged H-beam rods with ARP 8740 bolts.
• 2618 forged dished pistons at -16cc with two valve reliefs and plasma moly rings.
• Compression works out to 10.4:1 with 58cc chambers, 9.8:1 with 64cc and 9.2:1 with 70cc.
• Dura-Bond cam bearings installed and clocked, brass freeze plugs and oil galley plugs installed and sealed.

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