Icon FHR Pistons IC10025-STD Fits SBF Windsor Flat Top 11cc Bore 4.000

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

Mini grooves allow an overheated pistons to transfer heat to the wall

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

1.5 x 1.5 x 3.00 rings not included

Compression Ratio 289 - 54cc 8.8:1, 58cc 8.4:1, 64cc 7.9:1 / 302 54cc 9.4:1, 58cc 9.0:1, 64cc 8.4:1 / 393 54cc 11.8:1, 58cc 11.2:1, 64cc 10.5:1

Advertised piston weight 528 grams, 131 gram wrist pin

OE Deck Height 8.206"

Note: Standard bore size is 4.000"

Note: 289 - Offset Pin. Update includes 1/16th ring pack and round wire lockrings

Note: 302 - Offset Pin. Replaces IC9924. Update includes 1/16th ring pack and round wire lockrings

Note: 393 - Offset Pin. Use 351W block. Replaces IC9924. Update includes 1/16th ring pack and round wire lockrings

Replaces IC9972