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HT383
GM crate engine
Call
us toll-free at 1-800-926-4977 ext. 1232 (or 330-792-5258) between 7:30 a.m. and
9 p.m. EST Monday through Friday and 8 a.m. 'til 4 p.m. Saturdays about this
exclusive Greenwood Chevy Performance Parts special!
Truck
Power to Tow & Go!
Specially tuned for torque, the all
new HT 383 delivers great truck power in a small-block package. With its
3.80" stroke and Vortec cylinder heads the HT 383 makes awesome torque,
down low where you need it for towing or four wheeling off road. Peak torque is
415 Ft/Lbs at 3500 RPM, but the HT 383 makes over 400 Ft/Lbs between 2500 and
4000 RPM ! Developed as a truck engine, with a truck grind roller cam, heavy
duty forged powdered metal connecting rods, forged crankshaft and hypereutectic
pistons the HT 383 is designed to be worked. 325 horsepower at 4500 RPM doesn't
hurt either.
The HT 383 should only be used in 1973 and earlier pre-emissions street vehicles
or any year off road vehicles.
HT 383 Technical Information
Horsepower
.........................................................................340
@ 4500 RPM
Torque .....................................................................435
Ft. Lbs. @ 4000 RPM
Maximum Recommended RPM
................................................................5000
Compression Ratio
...................................................................................9.1:1
Block
.............................................................................4-Bolt
Main, Cast Iron
Crankshaft....................................................................12489436
4340 Steel
Connecting Rods
.............................................................................12497624
Pistons .......................................................12489437 High Silicon Aluminum
Piston Rings
....................................................................................12522848
Camshaft
.........................................................................................14097395
Intake Manifold .........12496820 Aluminum Dual Plane w/Duel Carb & EGR
Heads..................12558060 - Cast Iron Vortec 64cc Combustion Chambers
Intake
Valves....................................................................
10241743 - 1.94"
Exhaust
Valves...................................................................12550909
- 1.50"
Valve
Springs..............................................................10212881 -
1999 L31
Rocker Arms .............................................................1.5
Ratio Stamped Steel
Valve Lash
.................................................................................................Zero
Spark Plugs
...............................................................R44LTS or
Rapidfire #3
Fuel
..................................................................................................87
Octane
Timing..............32° Total @ 4000 RPM with Vacuum Advance Disconnected
GM recommends a Rochester Quadrajet
or Holley 750 CFM carburetor for the 383 applications.
Part number #12499101
Only
$4,395.00*
*
Price subject to change without notice
Tech Tip
"Oil Filter & Oil Cooler Bypass Valves"
From Speed Reading by Wade Hajek of GM Performance Parts
Gen V and Gen VI big-block crate engines come with two oil pressure bypass valves
installed in the engine blocks. Both of these valves are rated at 11 psi pressure
differential. One valve is for the oil filter and the other is for the production oil
cooler. If you install an aftermarket oil cooler or remote oil filter that attaches to the
oil filter pad on the engine block, you should be aware that you need to change the oil
filter bypass valve in the engine block. The aftermarket oil lines add resistance which
will cause the bypass valve to bypass the aftermarket oil cooler and/or oil filter all the
time. Obviously, if the cooler and filter are bypassed the oil will be dirty and hot. Your
engine could run hotter and could be damaged by dirt in the oil. If you choose to use an
aftermarket cooler or remote oil filter that attaches to the pad, you should change the
bypass valve to one with a higher differential pressure rating. A good choice would be GM#
25161284 which is rated at 30 psi. Remove the valve that is closest to the crankshaft and
replace it with the new valve. Press the new valve into the engine block and stake it in
three places. You should note that the bypass valves don't need to be changed if you use a
production oil cooler which uses the production holes in the engine block and you don't
use a remote oil filter. Also, if you use an adapter that just angles the filter for
clearance you don't need to change the bypass valves.
GM
PARTS WARRANTY INFORMATION:
Due
to the nature and intended usage of GM Performance Parts, the parts available on
this website and in our walk-in store (except for engines and partial engines)
are sold without any express or implied warranty of merchantability or fitness
for a particular purpose. The entire risk as to the performance of such parts is
with the buyer. Should such parts prove defective following their purchase, the
buyer and not the manufacturer, distributor, or retailer, assumes the entire
cost of all necessary servicing, repair, damage or loss to property and
consequential damage. "Engine and Partial Engine Warranty" under the
provisions of the General Motors Dealer Service Parts and Accessories Warranty
Section 1.1.3a, engines and partial engines, including partial engines in kits,
are warranted against defects in materials and workmanship. This warranty
specifically excludes engines and partial engines used in racing or competition
or that fail as a result of alteration. These engines and partial engines are
not designed or approved by General Motors for marine use. Installation of GM
Performance Parts may adversely affect GM New Vehicle Warranty. Please consult
your dealer for terms and conditions.
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