KB Hypereutectic SB Chevy Dished Piston Set - 4.155" Bore - 3.750" Stroke - 5.700" Rod Length 4125CMDBU Performer 351-4V is designed for

Performer 351-4V is designed for street 351C and Boss 351 Fords that came stock with 4V carb and heads

Small GM Style

Fits 2003-2008 Dodge Ram 2500

driver and engine

They will not affect the rate of your chassis springs

KB Hypereutectic SB Chevy Dished Piston Set - 4.155" Bore - 3.750" Stroke - 5.700" Rod Length 4125CMDBU Performer 351-4V is designed forModern piston design locates the top ring higher for improved performance. a high top ring operates at higher temperatures and requires a larger top ring end gap. To find the proper ring end gap, multiply your bore size by the ring end gap factor listed on the chart (i. e. , Street Normally Aspirated 4. 000" bore x . 0065" gap factor = . 026" total top ring end gap). Your hypereutectic performance piston will expand less than typical cast or forged