SMALL BLOCK CHEVY CAST IRON ENGINE BLOCKS

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Advanced engine builders, maximum competition, unlimited late model, off-road truck. Spread bore space requires special 4.500” cylinder heads and components..

This block features cylinder bores which have been spread to 4.500” from the standard 4.400” center to center dimension. This allows larger bore diameters while maintaining adequate cylinder wall thickness and gasket sealing surface between bores.

Features

• 4.500” bore spacing allows bore sizes up to 4.250”.

• Standard 9.025” and tall deck 9.325” or 9.500” versions allow greater versatility.

• Raised camshaft .391” (4.912” camshaft-to-crankshaft centerlines) provides more clearance for stroker cranks and eliminates need for fragile small base circle cams. Option for .434 raised cam available as special order upgrade.

• Relocated oil pan rails are spread .400” per side (.800” wider than stock) to increase crank/rod clearance and reduce windage losses.

• Requires use of remote oil filter. No provision for block mounted filters.

• Oil pan bolt holes are relocated in line with main caps to eliminate interference with rotating assembly.

• Big block camshaft bearings allow the use of cams with larger base circle diameter to improve strength and reduce twisting with cam-driven pumps.

• Dual starter mounts allow starter to be mounted on either side of block for chassis and oil pan clearance.

• Front & rear external oil inlets, crossovers, and restrictor provisions to simplify plumbing with external pump.

• Parts kit included (PN 32000052) Parts kits do not include cam bearings.

IRON EAGLE 4.500” SPECS

Material: 220 BHN Cast Iron

Deck Height: 9.025” to 9.325”

Bore Spacing: 4.500”

Cylinder Bores: 4.180” 4.250” (max)

Main Bearings: 350 or 400

Main Caps: Steel 4-bolt

Oil Pan Rails: Spread .400”/side

Cam Location: Raised .391” or .434"

Cam Journal: BBC, 50mm or 55mm

Lifter Bores: Stock .842”

Freeze Plugs: Press fit

Rear Seal: 2-Piece

Weight: 208-224 lbs.