Dart block sleeves are durable and reliable! Dart replacement sleeves are the same premium sleeves as those used in their race series blocks. Fit your aluminum blocks with the strength of Dart cast iron block sleeves.

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

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

$338.86

MELLING Cylinder Sleeve, Cast Iron, 2.375 in. Bore I.D, 0.094 in. Wall Thickness, 7.000 in. Length, Each

MELLING Cylinder Sleeve, Cast Iron, 2.375 in. Bore I.D, 0.094 in. Wall Thickness, 7.000 in. Length, Each

$35.16

Dart Cylinder Sleeve, Cast Iron, 3.300 in. (84.5mm) Deck, 5.00 in. Length, Each

Dart Cylinder Sleeve, Cast Iron, 3.300 in. (84.5mm) Deck, 5.00 in. Length, Each

$135.88

Dart Cylinder Sleeve, Cast Iron, SBC 9.500 in. Deck, 4.125 in. Bore, 6.500 in. Length, +.010 NF x thick, Each

Dart Cylinder Sleeve, Cast Iron, SBC 9.500 in. Deck, 4.125 in. Bore, 6.500 in. Length, +.010 NF x thick, Each

$237.71

Sonnax Isolator Sleeve Kit, GM, 4L60-E, 4L65-E, 4L70-E, Each

Sonnax Isolator Sleeve Kit, GM, 4L60-E, 4L65-E, 4L70-E, Each

$27.46