RHS - LS Tall Deck 9.750" Engine Block

RHS, Aluminum LS Engine Block, 9.750" Tall Deck Block, 4.120" Bore, Ready to Hone, Maximum Bore 4.165", Siamese Cast Bore Walls, Billet rear cover Included

Part #: 54901U 
Deck Height: 9.750" 
Bore Size: 4.120" 
Bore Finish: Bored
Liner Length: 6.38" 
Cyl. Wall Thickness: .925" 
Weight: 124 lbs.
Deck Thickness: .750" 
*Ra: 0.4 µm +0.25/-0.15 µm
See Illustration A for deck height measurements.
Material: A357-T6 Aluminum
Liner O.D.: 4.305"
Parent Bore Thickness: .200"
Stroke: Tall Deck ? 4.600" (may require final notching of liners for rod clearance)
Standard Deck ? 4.250" (may require final notching of liners for rod clearance)
Camshaft Position: Raised .388"/9.86mm (requires 2 extra links in timing chain)
Cam Thrust Plate: RHS #549102 included with block
Rear Cover: RHS #549101 included with block
Cam Bearing: Durabond Babbit Bearing ? installed and microfinished for 55mm cam
Lifter Bores: Machined for .842" lifter (material to accommodate 1.060" bushing for key lifter)
Lifers Style: Requires tie bar style lifer (will not accommodate OE trays)
Main Bearing Bore: 2.751" +/- .0003" (69.88 mm +/- .009)
Main Caps: 8620 Billet
Main Studs: ARP 2000 7/16"-20 x 5.150" x 7/16"-14
Main Bolts: ARP 8740 3/8"-16 x 1.250"
Oil System: Priority Main Oiling with -12 AN provisions front and rear
Oil Pan: Stock bolt pattern, pan will depend on stroke/rod clearance requirements
Head Studs: 6-Bolt LSX Pattern- M11 x 2.0 & M8 x 1.25 (not included)

Freeze Plugs: Threaded -12 AN (included with block)
? Long Arm Friendly ? Engineered to Clear 4.600" Stroke with 2.100" Rod Pin a

Tech Information: https://www.compcams.com/amfile/file/download/file/2298/product/42846