The high compression version of the 377 Small Block Chevy short block. Flat top forged pistons push static compression well past the dished build, which suits a small chamber aluminum head and an aggressive camshaft on race gas or a well controlled pump gas tune. Supplied on a new one-piece rear main seal block.

ATK Engines SP52NB 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 nodular iron crankshaft with Scat 4340 forged I-beam rods and ARP 8740 bolts.
• Forged flat top pistons at -3.7cc with plasma moly rings.
• Compression works out to 12.1:1 with 58cc chambers, 11.2:1 with 64cc and 10.5:1 with 70cc.
• Dura-Bond cam bearings installed and clocked, brass freeze plugs and oil galley plugs installed and sealed.

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