KB Hypereutectic SB Chevy Flat Top Lightweight Piston Set - 4.040" Bore - 3.480" Stroke - 5.700" Rod Length HTA20003 5" behind and 6

5" behind and 6

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Holley GM LS1 Valve Cover Set - Polished 241-90

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KB Hypereutectic SB Chevy Flat Top Lightweight Piston Set - 4.040" Bore - 3.480" Stroke - 5.700" Rod Length HTA20003 5" behind and 6Modern 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