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Component Information:
Block
The ZZ383 Block is a 1986 and later (1 piece rear main seal) design. The block is bored and block deck plate honed to a finished
size of 4.005". Features include 4 bolt intermediate mains, clearanced for a 3.80" stroker crankshaft, and machined for hydraulic
roller or flat tappet lifters.
Crankshaft
The ZZ383 Engine comes with forged crankshaft part number 12489436. The crankshaft features are outlined below:
3.800" stroke
Externally balanced
2.45" main journals/2.10" rod journals
Radii on main and rod journals
One-piece style rear main
Number 1 and 4 crank pins hollowed
Rod and main oil hole chamfered
3.000" crank flange bolt circle
4340 steel alloy, nitride treated
Connecting Rods
Steel powdered metal connecting rod with the centerline of crank pin bore to centerline of piston pin bore is 5.700". It has been
machined to clear camshafts in most small block stroker applications.
Engine Bearings
Main engine bearings, part number 12499102, are a 3/4 groove design which maintains the full surface area in the most
highly loaded portion of the lower main bearing, while permitting improved oil flow to the rod bearing. Main bearings #1-4 are
manufactured from an H-14 (four metals) alloy and have a hardened steel backing made from SAE 1020 steel. The #5 flange
bearing is manufactured from an H-24 (tri-metal) alloy and has a hardened steel backing made from SAE 1008-1010 steel.
Rod bearings, part number 17800761, feature a full chamfer on one side to accommodate the radius on the crankshaft journal.
Rod bearings are manufactured from H-14 (four metals), and have a hardened steel backing made from SAE 1020 steel.
Pistons
New high performance hypereutectic flat top pistons featuring a special skirt coating designed to run with a piston to cylinder
wall clearance of .0010"-.0015" including the coating. These pistons were designed to take full advantage of the deck plated and
precisely honed engine block. They also feature a pressed piston pin.
Cylinder Heads
Aluminum "Fast Burn" cylinder heads, have the highest performance potential of any 23° small block cylinder head developed by
Chevrolet. The name "Fast Burn" refers to the cylinder head's ability to quickly and completely burn the air fuel mixture, resulting
in higher cylinder pressures and more power. The shape of the combustion chamber is designed to accomplish this "Fast Burn"
with flat top pistons. Like those supplied with the engine package. The "Fast Burn" head accepts both center bolt and early style
four bolt flange mount rocker covers. Intake manifold mating surfaces are drilled and tapped for both Vortec and conventional
raised port style intake manifolds. Vortec style manifold is used in this application.
This engine is equipped with cylinder heads 19300955 which can also be easily identified by having a Chevrolet Bowtie
embossed on the end of the head. These heads are equipped with LS engine "beehive" style valve springs that are blue in color.
ZZ383 Performance Crate Engine
TITLE
19329715
IR 11JL14
PART NO.
5
30
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