These are Chevrolet’s basic options for 502ci 502 Horsepower Premium Engine Kit part number 12371171. We can build a complete turnkey engine for you to your specifications if you need this. This page is just for giving everyone an idea of what can be done and what additional cost would be involved.
    Keys - scperformanceeng, gmperformanceeng, or gmgoodwrencheng for SC, GM, or Goodwrench engines. Use allengine for a complete list of all three.
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ZZ 502/502 Base Long-Block Kit ZZ 502/502 Base Long-Block Kit Assembled
ZZ 502/502 Premium Engine Kit ZZ 502/502 Premium Engine Kit Options
ZZ 502/502 Premium Engine Kit Assembled Chevrolet Ultimate Street 502
Chevrolet Ultimate Street 502 Dyno Pictures Chevrolet Ultimate Street 502 Pictures
Chevrolet Ultimate Street 502 Parts Pictures ZZ 502/502 Partial Engine Block
Chevrolet Fuel Injected 502 RPM PRO-FLO EFI Ram Jet 502
HT 502 Tow Truck Engine HO 502 Engine Assembly
502 Retro-Kit 1991 - 1993 P/U Conversion Kit Super Street 502 Dyno Pictures
Super Street 502 Main Page Super Street 502 Pictures

We have more GM and Chevrolet Performance Engines available.
We have more GM Stock Replacement Long-block Goodwrench Engines available.
We have more “Gen 3” and “Gen 4” Design Engines available. (LS1, LS2, LS6, LQ4, LS7)

Options For Part #12371171 502ci 502 Horsepower Premium Engine Kit
The Ultimate Street 502 is at the bottom of the listed options.
Option Price *Labor
A Dyno testing, break in calibration.
Your engine will be completely tested and broke in (ready to run). Carb jetting distributor calibration set to a premium performance level. Includes a video of your engine on the dyno, with one test run. You will also receive dyno sheets showing power and torque output.
$495.00 None
B MSD Distributor upgrade.
Includes a billet distributor, high output coil, 6AL box with rev limiter produces a hotter spark which equals more horsepower. This distributor is also required for some cars having fire wall clearance problems.
$420.95 None
C Ignition wires and looms. Prices start at... $95.00 None
D Fluidampr 8” External Balancer $290.00 $20.00
E SFI¹ Flexplate², 14” 168 Tooth $115.00 $20.00
F Oil Pans
1 - Moroso P/N 20411 6 quart Camaro/Chevelle oil Pan, P/N 24440 pickup tube/screen, P/N 25970 chrome dipstick, and chrome dipstick tube. Works with excising OEM oil pump. (Pic) (Order as F1)
2 - GM P/N 12495360 4 quart oil pan, with pickup tube/screen, oil dipstick, and oil dipstick tube. Recommended for low ground clearance street rods and 64-67 Chevelles for clearance problems. (Order as F2)

$250.00

$165.00

$80.00

$80.00
G Exchange Short Water Pump for Long Water Pump $76.00 None
H Electric Fuel Pump. Includes Safety Switch. $95.00 None
I Flywheel², 14” 168 Tooth. Includes Bolts.
$115.00 None
J Drill and Tap for Clutch Pivot Ball (Engine already on engine stand.)
Buy this option (Engine has to be put on a stand.)
 
 
$65.00
$85.00
K SFI¹ 14” 168 Tooth Flywheel² $295.00 None
L ARP Stainless Bolts Call Call
M March Aluminum Pulleys and Brackets. Call Call
N Edelbrock Dual Quad. Includes two 1405 Performer Carbs, Aluminum Intake, Linkage, Fuel Line, and Chrome Air Cleaner. (pic) $795.78 None
O Head Porting (30 Horsepower Increase) $575.00 None
P Show Polish Heads and Intake Manifold $850.00 None
Q Show Polish Valve Covers $185.00 None
R Rectangular Port Head Conversion. Less Carb, Intake, and Distributor. Lower Compression for Blown Applications. We recommend that you also get option V along with this option. $600.00 None
S Assemble Engine with Carburetor $250.00 None
T Crower Stainless Steel Roller Rockers. Requires longer ARP Studs, Mill Drippers on Valve Covers, plus a 5/16 Fel-Pro Valve Cover Gaskets. Also, an ARP Valve Cover Stud Kit. $395.00 40.00
U
50 Horsepower Up Grade
Click here for dyno results.
This 552 HP 502 includes:
Crane Came P/N 168761 (Duration at .050” 230I, 236E, Lift .598” I, .610” E),
Option R (Head Porting), Option X (Crower Stainless Roller Rockers), High Lift Crane Hydraulic Roller Lifters P/N 16535-16, and Crane Valve Springs P/N 99895-16.
SC50250HP None
V 128 Horsepower Up Grade.
Choosing Option Z means that you get the following:
The Ultimate Street 502
P/N SC502US
Use the part number to find the price on our data base.
Our highest horsepower Street Engine.
Power Output 630HP @ 5600 RPM, 605 FT/LBS @ 4400 RPM
SC502US None
Note* - This is the additional cost if we install the item.
Note¹ - SFI is a company that approves parts for safety and meet NHRA regulations.
Note² - Flywheels are for manual transmissions and Flexplates are for automatic transmissions.
A Small Note About Upgrades - Part prices for upgrades are with exchange of existing parts for the upgraded parts. In other words, Chevrolet keeps the original parts and substitutes the upgraded parts. This allows Chevrolet to sell the upgraded parts, as an option, lower then if you bought the upgraded part by itself. If you wish to keep the original part along with upgrading, you will have to call our toll free 1-800 number for the cost.
     Our list of options are only what most people are looking for in options, but you are not limited to the list of options shown. Our Race Shop can do almost anything that you request as long as it is physically possible. Putting V8 heads on a V6 block would be an example of not being physically possible. Our Race Shop can build a crate engine to your specification with pulleys, brackets, engine mounts, all the way to a complete turnkey engine ready to drop in place that will meet your application needs. Call our toll free 1-800 number to talk to one of our counter people and they will be happy to work with you and help you determine what you will need for your new engine to fit your application and meet your desired goals.