Tech Tip - Oiling System

Features:

• Ductile iron 4-bolt mains caps for ultimate bottom-end strength
• Siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300 in. thick with 4.625 in. bore)
• Uses +.300 in. tall GM Gen VI style lifters
• Crankshaft tunnel has clearance for a 4.500 in. stroke with steel rods without grinding
• Main bearing caps have splayed outer bolts for extra strength
• True priority main oil system lubricates the main bearings before the lifters
• Stepped main oil gallery (9/16 in. to 1/2 in. to 7/16 in.) increases the flow of oil to the crankshaft at high RPM, and front oil crossover eliminates internal oil leaks around the distributor shaft
• Lifter valley head stud bosses prevent blown head gaskets
• Dual oil pan bolt patterns fit standard and notched oil pans
• 220 BHN cast iron block material
• .842 in. lifter bores
• Press-fit freeze plugs
• 2-Piece rear main seal
• Includes block parts kit 301-32000002 - coated cam bearings, freeze plugs and dowel pins

Specifications:

Material: Superior Iron Alloy
Bore: 4.250'
Bore & Stroke: 4.625' x 4.750' max recommended
Cam Bearing Bore ID: 2.1195' - 2.1205'
Cam Bearings: Special coated, grooved, with 3 oil holes
Cam Bearing OS: +.010', +.020', +.030'
Cam Bearing Press: .002'
Camshaft Position: Standard
Cam Drive: Standard Timing chain, gear drive or belt drive
Cam Plug: Standard BBC 2-7/32' (2.218' dia)
Cubic Inch: 632' max recommended
Cylinder Wall Thickness: .300' min @ 4.625' bore
Deck Height: 10.200'
Deck Thickness: Adequate for all applications
Fuel Pump: Mechanical pump provision
Fuel Pump Pushrod: Standard BBC
Freeze Plugs: Press in cup plugs
Head Gasket: Fel-Pro 375-1037, 1047, or 1067
Inner Head Stud: 2 slotted bosses per side
Lifter Bores: BBC .8427' - .8437'
Lifter Galley: Raised .350' for longer lifter bore
Lifter Type: Roller - Gen VI (+.300' longer), Solid - Mark IV
Main Bearing Size: Standard BBC
Main Bearing Bore: 2.937' - 2.937'
Main Caps: 4-bolt steel billet
Main Cap Register: Deep stepped register on each side (No need for dowels)
Main Cap Press: .005'
Main Cap Bolts: All 1/2', #2, #3, #4 have splayed outer bolts
Oil System: Wet or Dry Sump - Main Priority Oiling
Oil Galley, Main: Stepped, 9/16' - 1/2' - 7/16'
Oil Galley, Filter-Main: 5/8'
Oil Filter: Stock Oil Filter Location
Oil Pan: Standard pan bolt pattern, extra bolt holes provided for strokers
Rear Main Seal: Standard 2-piece seal, Fel-Pro 375-2918
Rear Main Thrust Width: 1.622' - 1.624'
Serial Number: On main caps
Starter: Mounts in standard location
Stud Hole, Head: Blind holes
Timing Chain/Gears: Standard
Timing Cover: Stock Cover
Torque Specs: All 1/2' bolts - 105 lbs
Weight: 4.250' bore - 280 lbs

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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