Dart Big M Cast Iron Block - 10.600" Deck, 4.600" Bore, Steel Caps 

Dart Big M Cast Iron Block - 10.600" Deck, 4.600" Bore, Steel Caps, New Race Series

• Siamesed extra-thick cylinder walls resist cracking & improve ring seal (minimum .300" thick with 4.625" bore).

• Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
• Standard 9.800" and extra-tall 10.200" deck heights available for stroker engines.
• Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength.
• Crankshaft tunnel has clearance for a 4.500" stroke crank with steel rods without grinding.
• True "priority main" oil system lubricates the main bearings before the lifters.
• Oil filter pad is drilled and tapped for an external oil pump.
• Rear four-bolt cap uses standard oil pump and two-piece seal - no adapter required.
• Lifter valley head stud bosses prevent blown head gaskets between head bolts.
• External block machining reduces weight without sacrificing strength.
• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Bellhousing flange and rear main bearing are reinforced with ribs to resist cracks.