Dart Iron Eagle 4.5 BS Small Block Chevy Racing Blocks

$3,074.00$3,387.00 Each - Free Shipping

N/T Small Block Racers – 4.5″ Bore Space for that BIG “Small” Block Chevy! Up to 4.250 bore and 4.125 Stroke equals 468 cubic inches of ultra nasty Small Block.

4.5″ Bore Space Engines allow for bigger bore sizes with far better between bore cylinder sealing, but they do require special heads and intakes.

  • 4.500” bore spacing allows bore sizes up to 4.250”.
  • Deck heights of 9.025” up to 9.325” versions allow greater versatility for preferred rod ratio and angle.
  • Raised camshaft .391” (4.912” camshaft-to-crankshaft centerlines) Option for .434 raised cam also available.
  • 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 an external pump.
  • Parts kit included (PN 32000011).
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