Dart Cylinder Sleeve, Cast Iron, BBC 9.800 4.250 in. Bore, 6.370 in. Length + .030, Each

Precision cast iron sleeving that keeps a big block alive under real load.

• ▸4.250 in. bore suits serious BBC stroker builds
• ▸Cast iron construction resists heat and wear long-term
• ▸6.370 in. length with +.030 sizing for accurate fitment
• ▸Dart quality means consistent wall thickness throughout
• ▸Drop-in replacement for worn or damaged factory bores