Darton Sleeves Replacement Cylinder Sleeve Donovan SB Chevy Block 3.990 Bore GBDXX1 Borla gives you a variety

Borla gives you a variety of choices for the volume and character of your exhaust note

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crossovers

and the bore size is prominently engraved in 3/4 in high numbers for easy identification

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Darton Sleeves Replacement Cylinder Sleeve Donovan SB Chevy Block 3.990 Bore GBDXX1 Borla gives you a varietyProduct Description: Cylinder Sleeve 3. 990 in Bore 5. 575 in Height 4. 273 in OD 0. 141 in Wall Steel Donovan Small Block Chevy Sold Individually Darton is a manufacture of engine block sleeves. Using specialized ductile iron, their sleeves fit a variety of engine makes and sizes.