Performance Small Block Bare Block

This engine block is used in 1986-99 Gen I heavy-duty applications. It has 4.005" diameter finished cylinder bores and four-bolt main bearing caps. This block is machined for a one-piece rear crankshaft seal. (Does not include rear seal or adaptor.) This block has machined oil pan rails to clear the 3.800" stroker crank (see below) used to create the GM 383 crate engine. This block weighs 181lbs.
Technical Notes: Cylinder wall thickness is the same as current production engines. The lifter valley is machined for hydraulic roller and flat tappets.

Installation Notes

• GM 383 Crate Engine Crankshaft 12489436
• GM 383 Crate Engine Piston 88962748
• Bearing Kit 17800761
• Connecting Rod 19169670

Note: Crankshafts with 2-piece seals can be installed with 10051118 Adapter

Specifications

• Cam Bearings Included: Yes
• Cylinder Bore as Shipped (in.): 4
• Cylinder Bore Diameter (in.): 4
• Engine Block Material: Cast iron
• Engine Block Style: Stock/OEM standard deck
• Engine Block Weight (lbs.): 181
• Finished Cylinder Bores: Yes
• Freeze Plugs Included: Yes
• Main Bearings Included: No
• Main Bolt Style: 4-bolt
• Main Cap Fasteners Included: Yes
• Main Cap Material: Nodular iron
• Main Caps Included: Yes
• Main Journal Type: 350 mains
• Quantity: Sold individually
• Raised Cam Location: No
• Rear Main Seal Style: 1-piece