Mahle MS Piston Set GM LSX 403cid 4.005x1.110RCH 4.0 Stk 6.125 Rod .927 Pin -14cc 10.0CR - Set of 8

If you're building a high-performance GM LSX engine and need a solid set of pistons to handle the power, this Mahle MS Piston Set is a strong contender. These are designed for a 403 cubic inch displacement, featuring a 4.005-inch bore and a 4.000-inch stroke, which is a common setup for LSX builds looking for more displacement. The -14cc dish volume combined with the specified compression height and rod length helps achieve a 10.5:1 compression ratio, making them suitable for naturally aspirated or forced induction applications where pump gas might still be a consideration.

Mahle uses 2618 aluminum for these pistons, a well-known material in performance engine building for its strength and durability under high stress. Each piston weighs in at 400 grams, which is a reasonable weight for a forged piston of this size, balancing strength with rotational mass. The 1.110-inch compression height and the 0.927-inch wrist pin diameter are standard dimensions that ensure compatibility with many popular connecting rods and crankshafts used in LSX builds. This set includes eight pistons, so you'll have everything you need for a complete engine rebuild.

When installing these pistons, remember they are designed for performance applications and may require specific ring gap settings and assembly procedures. It's always best to consult your engine builder or Mahle's technical documentation for the precise installation guidelines to ensure optimal performance and longevity. Please note that these pistons are not CARB approved and cannot be shipped to California.