The Dart Iron Eagle eliminates the compromises found in production blocks. Iron Eagle small-blocks are available in standard (9.025") and tall-deck (9.325") versions so you can select the crankshaft stroke and connecting rod length that’s right for your combination. Dart also offers a choice of 350 or 400 main bearings to fit factory and aftermarket cranks.

Dart raised the camshaft and spread the oil pan rails to provide extra clearance for stroker cranks. The versatile Iron Eagle block is the perfect starting point for a big-inch small-block project - you can build a 455ci small-block with Dart!

Dart machines the Iron Eagle block to precise tolerances, eliminating the cost of expensive “blueprinting” a production block

• Siamesed cylinders: Standard 4.00” or 4.125” cylinders can be safely bored to 4.185”.
  Ductile iron sleeves and extra-thick walls prevent cracking and produce excellent ring seal
• Relocated oil pan rails are spread .400” per side (.800” wider than stock) to increase crank/rod clearance and reduce windage losses
• Oil pan bolt holes are relocated in line with main caps to eliminate interference with rotating assembly
• Main bearing bores available for 350 (2.45”) and 400 (2.65”) bearings allow engine builders to maximize crankshaft strength and minimize friction
• Steel four-bolt main bearing caps increase bottom end strength and minimize bearing bore distortion. Rear main cap has mount for internal oil pump
• Two-piece rear main seal fits standard racing crank shafts without adapters
• Raised camshaft .391” (4.912” camshaft-to-crankshaft centerlines) provides more clearance for stroker cranks and eliminates need for fragile small base circle cams
• Big-block camshaft bearings allow the use of cams with larger base circle diameter to improve strength and reduce twisting with cam-driven pumps
• Chain, belt, and gear camshaft drives are available for Iron Eagle and Aluminum blocks
• Dual starter mounts allow starter to be mounted on either side of block for chassis and oil pan clearance
• Side and front engine mounts accommodate any type of chassis mounting
• Fuel pump boss mounts a standard small-block mechanical fuel pump (requires .200” longer big-block pushrod)
• Scalloped water jackets increase coolant flow around cylinder barrels to prevent detonation, extend engine life and produce consistent cylinder temperatures

Race series blocks have a raised cam location and spread oil pan rails to clear large stroker crankshafts. Coated cam bearings, freeze plugs and dowels are included. Machined with front and rear external oil feed, crossover and restrictor provision.