Icon FHR Pistons IC9953-STD Fits BB Chrysler 440 Flat Top 5.6cc Bore 4.320

Icon's FHR (Formed Head Relief) pistons deliver quality on a budget. FHR pistons have valve reliefs that are formed into the piston as the forging blank is pressed into the die. Many of the FHR dome pistons feature a solid dome. This gives engine builders the flexibility to machine the dome to their desired compression ratio. FHR pistons are 11% silicon which means they can be installed with tighter piston to wall clearance. In addition, the use of 4032 aluminum decreases the friction created during engine operation, this results in extended piston life and reduced wear

Skirts machined by UEM's unique in house built cnc machines

Die formed relief valves

Accumulator groove to help eliminate flutter and maximize ring seal

Wrist pins and spiral lock included

5/64 x 5/64 x 3/16 rings not included

Compression Ratio 72cc 11.5:1, 80cc 10.6:1, 90cc 9.7:1

Advertised piston weight 692 grams, 190 gram wrist pin

OE Deck Height 10.725"

Note: Standard bore size is 4.320

Note: Centered Pin.