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Component Information:
Block
The HT383E Block is a 1986 and later (1 piece rear main seal) design. The block is bored then 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.
Any small block engine, regardless of year, that uses Vortec heads, will require an external coolant bypass line
from the intake manifold to the 5/8" hose nipple on the water pump (passenger's side). Suggested routing is from
the 3/8 NPSF boss on intake manifold to the water pump.
Crankshaft
The HT383E 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.
Water Pump
The HT383E engine comes with a long leg style cast iron water pump.
Crankshaft Position Sensor (CKP)
The HT383E includes a crankshaft position sensor and the crankshaft target wheel behind the front cover. The
crankshaft position sensor (CKP) mounting position is located in the front engine cover and is perpendicular to the
crankshaft target wheel. The air gap between the sensor and the wheel is preset and not adjustable. The target
wheel has 4 slots 60 degrees apart and is keyed to the crankshaft. As the target wheel rotates, the slots passing
by the sensor create a change in the magnetic field of the sensor which results in an induced voltage pulse. One
revolution of the crankshaft results in four pulses (4x signal). Based on these pulses, the VCM is able to determine
crankshaft position and engine speed. The VCM then activates the fuel injector and provides a spark to the
distributor.
HT383E Re-Power Kit
TITLE
19132024
REV 05AU14
PART NO.
5
27
SHEET
OF
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