Icon Pistons IC9919.040 FHR Forged Piston Set Chevy 454 Big Block 4.290" Bore

The Icon Pistons IC9919.040 is a complete 8-piston set engineered for Chevy 454 cubic inch big block engines. This FHR (Forged Head Relief) Series piston set features a solid dome design with 0.200" dome height and 18.3cc volume, providing excellent compression for high-performance street and muscle car applications.

Key Specifications:

• Bore: 4.290" (+0.040" oversize)
• Stroke: 4.000" crankshaft stroke
• Connecting Rod Length: 6.135"
• Compression Height: 1.645"
• Deck Height: 9.800"
• Wrist Pin: 0.990" diameter x 2.750" length (centered)
• Ring Grooves: 5/64" top, 5/64" middle, 3/16" bottom
• Top Landing Height: 0.325"
• Piston Weight: 657 grams

Performance Features:

• Premium 4032 aluminum alloy construction for superior strength and durability
• True arc-style lock rings for secure wrist pin retention
• Broached pin holes for precise fit and alignment
• Breakthrough oil return design for improved lubrication
• Closed chamber valve relief design

Compression Ratios: Achieves 11.8:1 with 96.5cc heads, 10.8:1 with 105cc heads, or 9.6:1 with 119cc heads, allowing flexibility for different builds and fuel requirements.

Icon FHR Series pistons deliver race-proven performance at a value-oriented price point. The forged construction provides the strength needed for high-horsepower applications while the 4032 alloy maintains tighter piston-to-wall clearances for reduced noise and improved cylinder sealing. Piston rings sold separately.