Dart Big M2 Engine Block Big Block Chevy 4.500" Bore, 9.8" Deck Height
- Part # 31213444
- Material: Superior Iron Alloy
- Bore: 4.500"
- Bore & stroke: 4.625" x 4.750" (max recommended)
- Cam bearing bore ID: 2.120" Std.
- Cam bearings: Coated, grooved, w/3 oil holes PN# 32210030 (Not included)
- Cam bearing O.S. +.010", +.020", +.030" available *Call for Part numbers
- Cam bearing press: .002"
- Camshaft position: Standard
- Cam Drive: Timing chain, Gear drive & Belt drive
- Cam Plug: Standard BBC 2.215" P/N: 32520000
- Cubic Inch: 632" (Max Recommended)
- Cylinder Wall Thickness: .300" min @ 4.625" bore
- Deck Height: 9.800"
- Deck Thickness: Adequate for all applications
- Dist. Tap Hole Valley: None
- Fuel Pump Boss: Mechanical pump provision
- Fuel Pump Pushrod: Std. BBC
- Freeze Plugs: Std. Press in cup plugs 1 5/8 “dia.
- Head Bolt Pattern: Std. BBC Big M Bolt Pattern
- Inside Head Studs: P/N: 64210240 (Not included)
- Lifter Bores: BBC .8427" - .8437" + .300 Taller Gen V, VI style
- Main bearing size: Std. BBC
- Main bearing bore: 2.937" – 2.938"
- Main caps: Steel Billet or Ductile Iron (Sportsman) 4 bolt
- Oil system: Wet or Dry Sump - Main Priority Oiling
- Oil Galley, main: Stepped, 9/16" – 1/2" – 7/16"
- Oil Cooler Holes: None (Can use aftermarket inline)
- Oil Galley, filter main: 5/8"
- Oil Filter: Stock oil filter location
- Oil Pan: Std. BBC bolt pattern & Stroker pattern at mains
- Rear Main Seal: STD 2 pc seal / Felpro# 2918 or 29182
- Hyd. Roller Provisions: None
- Serial No. On main caps / Front passenger side below deck
- Starter: Mounts in standard location
- Stud & bolt holes: Blind tapped
- Tapped Holes: Std. English Thread & Pitch
- Timing chain / gears: Std. BBC
- Timing Cover: Gen IV / V stock 10 bolt cover
- Torque Specs: All ½" bolts – 100 ft lbs w/CMD #3 high pressure lube
- Weight: 4.250" bore (280lbs) – 4.500" bore (260lbs)
- 4.600" bore (250lbs)