Chevrolet

Chevrolet

Chevrolet

DRCE Block

Chevrolet

Gen VI Production Short Deck Big Block

Production 502 Block Prod

Gen V Bow Tie Tall Deck Big Block

Mark IV Aluminum ZLI

Part Number

12550307

10237292

24502502

24502572

12370850

Block Material

Cast Iron

Iron

Cast Iron

Cast Iron

Aluminum

Cylinder Wall Type

Non-Siamesed

Siamesed

Siamesed

Siamesed

Siamesed

Cylinder Deck Height

9.800"

9.800"

10.200"

9.300"-9.500

9.800"

Cylinder Bore Range

4.250-4.310"

4.47-4.500"

4.250-4.600"

4.500-4.600"

4.118" to 4.300"

No. Bearing Cap Bolts

4

4

4

4

4

Cap Bolt Orientation

Straight

Straight

Splayed 16

Splayed

Splayed

Bearing Cap Type

Cast Iron

Cast Iron

8620 Steel

8620 Steel

8620 Steel

Crankshaft Journal Dia.

2.75"

2.75"

2.75"

2.75"

2.75"

Oil Sump Type

wet

wet

wet

dry

wet or dry

Crankshaft Seal Type

1 Piece

1 piece

2 Piece

2 Piece

2 piece

Design Max. Stroke

4.250"

4.600

4.600"

4.600"

4.375"

Weight (lbs. - bare)

N/A

269

273

255

110

Intended Usage

Street

Street - Modified

Professl Comp.

Professl Comp.

Street - Modified

Fuel Pump Boss

Has Fuel Pump Boss

No Fuel Pump Boss

No Fuel Pump Boss

Has Fuel Pump Boss

Non-Standard Parts
Required Special Features

Production Style with Fuel Pump Boss & Has
1 Piece Rear Main Seal

This Block is good for 700 H.P.

* Fully Race Prepared MMachining
* Valley Head Bold Bosses
* Enlarged Main Oil Gallery

* No Head Bolt Holes * No Lifter Holes
* Can be machined to 9.000 deck height

This is an Improved ZLI Block Good for
650 H. P.

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