Cast Iron Bow-Tie Bare Block (3.98 bore) 10051183 - Crate Engine Depot
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Top > Engine Components > Small Blocks & Components > Partial Engines - Bare Blocks - Components > Cast Iron Bow-Tie Bare Block (3.98 bore) 10051183 |
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Cast Iron Bow-Tie Bare Block (3.98 bore) 10051183
SKU: 10051183
RETAIL: $1,357.14
YOUR PRICE: $1,050.00
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Cast Iron Bow-Tie Bare Block (3.98 bore) 10051183 Description
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This updated design has a decidedly different appearance, but retains its original part number. New tooling procedures have significantly improved the quality and dura-bility of this third-generation casting. This heavy-duty cast iron Bow Tie block has rough-bored 3.98" diameter cylinders, which can be bored to a maximum diameter of 4.090". This block is recommended for maximum effort competition engines. The deck surfaces are thicker than production blocks, and the head bolt holes are blind tapped to improve head gasket sealing. The main bearing bulkheads are .900" thick and the front and rear bulkheads are reinforced with strengthening ribs. The updated design on this Bow Tie block's oil galleries now extend flush to the front and rear faces of the cylinder case and can interfere with some camshaft drive systems. Therefore, timing system clearance should be checked before engine assembly. The revised Bow Tie block has a boss below the bellhousing flange behind the #8 cylinder that can be drilled and tapped for lifter valley oil scavenging. The outer water jacket walls have bosses to allow coolant passages to be drilled between adjacent "siamesed" cylinders. Oil drainback holes in the lifter valley are drilled. The updated design provides more consistency in the thickness of the cylinder walls and water jackets. The "siamesed" cylinder bores have a nominal wall thickness of .340" at the casting parting line (measured 2" below the deck surface). Technical Notes: Oil dipstick hole is not drilled and the lifter holes are finish bored to production diameter .842". 2-bolt main bearing caps are installed to simplify the installation of the heavy-duty steel main caps with splayed outer bolts. Bow Tie blocks are designed for crankshafts with 2.45" diameter main bearing journals. The Bow Tie casting block P/N 10051184 is machined for a one-piece rear main bearing seal used on 1986 and later production small- block Chevrolet V8s. Crankshafts designed for two-piece rear main seals can be installed in Bow Tie blocks using crankshaft seal adapter P/N 10051118. These blocks weigh 187 lbs. Main bearing torque specifications for all Bow-Tie blocks are 65 lbs. inner bolts, 60 lbs. outer bolts and 40 lbs. on 3/8" front bolts with light oil.
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