Dart SHP Small-Block Chevy Blocks and Short Blocks Available as a short block or bare block the cast-iron small-block SHP offerings from Dart are available to motivate your muscle car project. The SHP bare blocks are designed for up to 600 HP and come in two part numbers (P/N 31161111 with 4.00-inch bore and P/N 31161211 with 4.125-inch bore). Made in the USA, these blocks are a great starting point and are manufactured in-house at Dart Machinery on their CNC for precise tolerances. Clearance for long stroke crankshafts and a true-priority-main oiling system are just a few of the vast benefits maintaining original first generation small-block dimensions the internals are compatible with stock components. If you desire a more complete package, Dart SHP short blocks are available in 372-ci and 400-ci configurations and include an internally balanced steel crankshaft, forged 4340 I-beam connecting rods with 3/8-inch cap screws, hypereutectic flat-top pistons with full floating wrist pins, Hastings moly rings, Clevite bearings, and coated cam bearings. SHP blocks and short blocks are a great ways to make big power on a budget.