CROSS BOLT BBC 1048Y Series
The CN Blocks 1048Y is a forged billet aluminum replacement block for the 481X engine. We have engineered many improvements into our 1048Y. First and foremost, it is a forged block and therefore is substantially stronger than the current cast 481X. The 1048Y is engineered to have better ring seal and maintain truer cylinders. With better ring seal you will make more power when using a 1048Y block. All five main caps are cross bolted and contribute to overall block strength. The 1048Y has been engineered with rod breakout panels to minimize block damage in the event of rod failure.
The 1048Y is available for standard tie bar lifters or Jesel dog bone lifters. The 1048Y accepts all current 481X accessories with the exception of sleeves and head studs. The head stud kit must be purchased separately and spare sleeves are available in semi-finished or finished forms.
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1048Y 4.840 Bore space, 481X replacement block
1048Y-RR 4.840" Bore space, 481X race ready replacement block. This version is honed, washed, and ready for race track assemly
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Premium CN Billet material
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CNC machined at CN Blocks
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Includes block, caps, main studs, and sleeves (installed)
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Deck height10.4
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Big Block Chevrolet main size and spacing
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All 5 aluminum main caps are cross bolted
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9/16 main studs, 1/2 side bolts
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Accepts all current 481X accessories
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Equal depth head studs for even clamping
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Special CN Blocks sleeves for better ring seal
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Improved oil system
OPTIONS:
HSK-1048 head stud kit with tool steel 3/8 stud
Sleeves 1048Y replacement sleeve (semi-finished)
Honed Sleeve ready to run, finished to 4.500
1048Y Parts Kit cam bearings, pins, pipe plugs, rear cam
bearing, snap rings, distributor bushing, oil restrictors, and o-ringsInstall Cam Bearings install cam bearings and pin
