BIG-BLOCK PRODUCTION BASED BLOCKS
19170538
427/454 BARE BLOCK
- 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
19170540
502 MARK-IV/GEN-VI BARE BLOCK
- New design casting incorporating the best designs of Mark IV and Gen VI
- Production-type cast-iron 4-bolt block
- Improved main bearing bulkheads-Bowtie block-style bulkhead
- Clearanced for bigger strokes
- 4.470” finished bore
- 4.600” max bore (siamese)
- Fuel pump pad has been added/machined
- New water jackets for use with Mark IV or Gen VI heads
- Revised oiling to allow for bigger cam bearings/cam lift
- Bolt boss (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
- Two bosses added for manual transmission clutch pivot (machined)
- Additional material added around lifter bosses
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