New production four-bolt main block includes standard 9.800" deck height and a 4.250" bore. Block includes a one-piece rear main seal and has no provision for a mechanical fuel pump. Features New design casting incorporating the best designs of Mark IV and Gen VI Production type cast-iron 4-bolt block 4.250" finished bore 4.310" max bore (non-siamese bore) Machined fuel pump pad New water jackets for use with Mark IV or Gen VI heads Revised oiling to allow for bigger cam bearings/cam lift Bolt boss (not machined) added near distributor hole like 8.1L Can be drilled for use with 10-bolt front timing cover Additional clearance added for roller timing chains Auxiliary oil pressure line added to front of block Racing-style oil filter cast feature with added oil pressure port Additional boss for manual-transmission clutch pivot (machined) Additional material added around lifter bosses
- Engine Block Material:
- Cast iron
- Engine Block Style:
- Stock/OEM standard deck
- Deck Height:
- 9.800 in.
- Cylinder Bore Diameter:
- 4.250 in.
- Maximum Bore Diameter:
- 4.310 in.
- Cylinder Bore as Shipped:
- 4.240 in.
- Finished Cylinder Bores:
- Yes
- Maximum Stroke:
- N/A
- Main Caps Included:
- Yes
- Main Cap Material:
- Cast iron
- Main Bolt Style:
- 4-bolt
- Main Journal Type:
- 454 mains
- Rear Main Seal Style:
- 1-piece
- Main Cap Fasteners Included:
- Yes
- Main Bearings Included:
- No
- Engine Block Weight (lbs.):
- 269 lbs.
- Raised Cam Location:
- No
- Cam Bearings Included:
- Yes
- Freeze Plugs Included:
- Yes
- Finish:
- Natural
- Quantity:
- Sold individually.
- Make:
- Chevrolet
- Engine Family:
- Chevy big block Mark IV
- Engine Family:
- Chevy big block Gen V
