MAHLE 930274010 POWERPAK Forged Flat Top Piston Kit Big Block Mopar 438ci 4.310 Bore

The MAHLE 930274010 POWERPAK Piston Kit is a precision-engineered forged flat top piston set designed for Big Block Mopar 383/400 engine builds displacing approximately 438 cubic inches at a 4.310-inch bore. Manufactured from 4032 aluminum alloy, these pistons deliver an ideal balance of strength and thermal stability for high-performance street and track applications.

Key Specifications:

• Engine Family: Big Block Mopar (B/RB – 383/400)
• Displacement: ~438 cubic inches
• Bore Diameter: 4.310 in.
• Stroke: 3.750 in.
• Rod Length: 6.760 in.
• Compression Height: 1.320 in.
• Wrist Pin Diameter: 0.990 in.
• Crown Volume: -8.1cc (flat top with valve reliefs)
• Compression Ratio: ~10.2:1 (calculated at zero deck with 0.040 in. gasket)
• Piston Weight: 499 grams each
• Alloy: 4032 Forged Aluminum

MAHLE POWERPAK Features:

• Grafal® Anti-Friction Skirt Coating — reduces drag, scuffing, friction, cylinder bore wear, and piston noise
• Hard Anodized Top Ring Grooves — extra protection against ring groove microwelding for extreme-duty use
• Slipper Skirt Forging Design — strong, lightweight, and low-drag; superior to traditional full-round designs
• Phosphate Coating — helps prevent microwelding in ring grooves and pin galling
• 4032 Aluminum Alloy — optimized for high-performance street engines requiring tight thermal expansion tolerances

MAHLE Motorsport POWERPAK kits are trusted by professional engine builders and performance enthusiasts alike, backed by decades of motorsport engineering expertise. The 930274010 is an excellent choice for a serious Big Block Mopar performance rebuild targeting pump-gas friendly compression ratios with proven forged durability.