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Chevrolet - 355 HP 5.7-LITTER ZZ4 350 HO CRATE ENGINE | |
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This page gives the description and specifications of the GMPP ZZ4 355 horsepower street
and race performance crate engine. The ZZ4 crate engine has proven itself many times over on the street, the drag strip,
and in road racing. Keys - scperformanceeng, gmperformanceeng, or gmgoodwrencheng for SC, GM, or Goodwrench engines. Use allengine for a complete list of all three. |
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ZZ4 PARTIAL ENGINE BASED ENGINES NAVIGATION | |
| GMPP ZZ4 Main Page | GMPP Fast Burn 385 |
| GMPP ZZ4 Options | GMPP Fast Burn 385 Circle Track |
| GMPP ZZ4 Partial Engine | GMPP ZZ4 Circle Track |
| Chevrolet Nostalgia ZZ4 HO 350 | Chevrolet Nostalgia ZZ4 HO 350 Pictures |
| Chevrolet ZZ430 | Chevrolet ZZ430 Pictures |
| Chevrolet Super AFR ZZ4 | Chevrolet Super AFR ZZ4 Pictures |
| GMPP HO 350 Camaro Conversion Kit (Discontinued) | Chevrolet ZZ4 EFI Option Pictures |
| GMPP Turnkey Fast Burn 385 | GMPP Turnkey Fast Burn 385 Parts |
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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) |
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HO 350 ZZ4 ENGINE DESCRIPTION | |
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355 H.O. 5.7-LITER “ZZ4” H.O. CHEVROLET V8 |
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P/N 24502609 5.7L (350ci) High Output Chevrolet V8 Several significant improvements have been made to the 350-cubic-inch High Output Chevrolet small-block V8. This updated engine assembly is available as part number 24502609 (ZZ4 manufacturing code). The 350ci High Output Chevrolet is the perfect power plant for many high-performance off-highway applications. The H.O. engine offers outstanding performance at an affordable price. It is a bolt-in replacement for all 265-400ci small-block Chevrolet V8s. High Output 5.7-liter engines are assembled using brand new, premium quality components. This assembly combines proven small-block components with the latest advances in engine technology, including lightweight aluminum cylinder heads, low-friction hydraulic roller tappets, and hypereutectic (high-silicon) pistons. All H.O. small-blocks are fire-tested and final balanced at the factory to ensure their quality and performance. Imagine an aluminum head small block that makes 355 horsepower. What if it had a steel roller camshaft, four-bolt main block, undercut rolled fillet crankshaft, high silicon pistons and strong PM connecting rods? GM imagined it, and then engineered, developed, tested and built it. The ZZ4 is the evolution of our popular ZZ series of small blocks that power thousands of street rods, hot street cars, circle track racers and drag racers. With over 400 ft.lbs. of torque, the ZZ4 is the best way to put an aluminum head, roller cam, high performance small block between your favorite fenders. The aluminum angle plug cylinder heads have screw in rocker studs, 1.94” intake and 1.50” exhaust valves and 58cc combustion chambers that yield a crisp and responsive 10 to 1 compression ratio. Also included are our lightweight valve spring retainers that weigh half as much as our previous design. The valve seats are radiused and we've included valve stem seals to help keep the oil where it belongs. To compliment the cylinder head design, GM incorporated a steel roller tappet camshaft with .474” intake and .510” exhaust valve lift. The combination makes 355 horsepower at 5250 rpm and has that great sounding muscle car idle, with just enough lope to let people know that this is no station wagon engine. Also included with the ZZ4 is an HEI distributor with an ignition timing advance curve developed for performance, a dual plane aluminum intake manifold that accepts your spread bore or square bore carburetor, an 8” high-RPM torsional damper, 12.75” auto trans flex plate and cast iron water pump. The ZZ4 is currently our most popular crate engine, and you can see why. With a long history of successes in circle track and drag racing as well as street rods and other performance applications, the ZZ4 may just be the bullet for your next project. The ZZ4 is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles. A prototype H.O. 350 engine with a Quadrajet carburetor, 1 3/4” headers, and low-restriction mufflers produced 355 horsepower (at 5250 rpm) and 405 lb.-ft. torque (at 3500 rpm). |
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ZZ4 ENGINE ASSEMBLY FEATURES | |
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Intake Manifold: A new low-profile dual-plane aluminum intake manifold (#10185063) produces the same
horsepower as previous high-rise designs, but provides increased hood clearance and more versatility.
The new manifold has a dual-pattern flange that accommodates both standard-flange Holley and
spread-bore Quadrajet four-barrel carburetors. It also has provisions for all late-model accessory brackets,
EGR (exhaust gas re circulation), and an integral hot air choke. (Block-off plates are installed on the EGR and
choke stove on H.O. 350 engines.) Camshaft: A new hydraulic roller camshaft (#10185071) bolsters mid-range torque and improves driveability without sacrificing peak horsepower. This dual-pattern profile has .474” intake lift and .510” exhaust lift. Intake duration is 208 degrees (at .050” tappet lift), and exhaust duration is 221 degrees. Valvetrain: The H.O. 350 valvetrain has been updated with light weight valve spring retainers that have half the mass of the previous design. Valve stem seals have been added to the exhaust valves to enhance oil control, and the aluminum cylinder heads are now outfitted with radiused valve seat inserts. Rocker Covers: The H.O. engine’s stamped steel rocker covers orient the PCV valve properly for most applications. Accessories: The 5.7-liter High Output engine assembly also includes a torsional damper, a cast iron water pump (standard rotation, long-style), a 12 3/4” diameter automatic transmission flexplate (153 tooth ring gear), and a dipstick. It does not include spark plug wires, pulleys, exhaust manifolds, a starter motor, an oil filter adapter, a fuel pump, or external accessories. Note: Service with eight AC FR5LS, 904, or MR43LTS spark plugs. If colder heat range is required, use FR3LS. |
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ZZ4 ENGINE SPECIFICATIONS | |
| Part Number: | 24502609 (ZZ4) |
| Displacement: | 5.7-liter (350 c.i.d.) |
| Bore/Stroke: | 4.00”x3.48” |
| Engine Block: | 10105123 Four Bolt Main, Cast Iron |
| Compression Ratio: | 10:1 |
| Pistons: | High silicon aluminum piston with offset pins, 10159436. |
| Crankshaft: | 12556307 Forged Steel |
| Connecting Rods: | 10108688 PM rods |
| Camshaft: | Hydraulic roller tappet (#10185071) |
| Valve Lift (Intake/Exhaust): | .474”/.510” |
| Duration (Intake/Exhaust): | 208°/221° @ .050” tappet lift |
| Valve Lash (Intake/Exhaust): | Zero/Zero |
| Cylinder Heads: | Aluminum, 58cc chambers, 12556463. |
| Valve Diameter (Intake/Exhaust): | 1.94”/1.50” |
| Valve Springs: | LT4 chrome silicon, 12551483. |
| Rocker Arms: | 12495490 - Kit, 1.5:1 ratio, self-aligning, stamped steel, 10089648 single replacement rocker arm. |
| Distributor: | HEI with centrifugal and vacuum advance, 93440806. Use connector P/N 12167658 to attach tachometer and 12-volt power supply wire to distributor. |
| Spark Plugs: | MR43LTS Gap .045, AC FR5LS Gap .035, Rapid Fire #5 Gap .045. |
| Fuel Requirement: | Unleaded Premium 92 Octane |
| ¹Ignition Timing: | 12° BTDC @ 800 RPM, 36° total @ 3,000 RPM with vacuum advance line disconnected and plugged. This setting will produce 36° of total advance at wide open throttle (WOT). |
| Max. Rec. RPM: | 5800 rpm |
| Flexplate: | 14088765 - For automatic transmissions, 153 tooth. Requires a starter with a straight bolt pattern or dual bolt pattern usable with a 153 tooth flywheel/flexplate. |
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Note¹: GMPP has 32° total timing for the ZZ4 which is incorrect. Please use the information that we show for Ignition Timing. Technical Notes: Carburetor, spark plug wires, starter, oil filter and oil filter adapter, and exhaust manifolds not included. Distributor P/N 93440806 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts. |
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PARTS THAT WILL WORK WITH THE ZZ4 | |
| Below is a sample of parts that will work with the ZZ4 to help you complete your crate engine installation or customize your crate engine for your specific application. See our ZZ4 Upgrades page for engine build options. | |
| STARTERS | |
| 12361146 |
Starter, Gear Reduction High Torque Mini Starter - 168 or 153 Tooth Non-Production Style, BRAND NEW. This lightweight (10.5 pound) and powerful (1.2 kilowatt output) starter relies on a 3.75:1 gear reduction to spin a high-compression engine. Red Chevrolet Bow Tie logo and a dual bolt pattern for 12 3/4” (153 tooth) and 14” (168 tooth) flywheel. (Page) Note: This starter is not recommended for competition. |
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| 12363128 | Starter, Gear Reduction High Torque Mini Starter - 168 or 153 Tooth Non-Production Style, BRAND NEW, Chrome. Same as P/N 12361146 except it is chrome plated. |
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| 10465143 | Lightweight Starter - This high performance starter was originally used on 1993-1997 Camaros and Firebirds with LT1 engines. This is for use with 153 tooth flywheels/flexplates only and has straight bolt hole pattern. (remanufactured) |
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| 14096871 | Standard Starter - Use with 153 tooth flywheels/flexplates only and has straight bolt hole pattern. (remanufactured) |
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| 10496873 | Standard Starter - Use with 168 tooth flywheels/flexplates only and has straight bolt hole pattern. This will not work with the 153 tooth flexplate that comes on the ZZ4. It is only for a person that wishes to convert to a 168 tooth flywheel or flexplate. (remanufactured) |
| LT4 HOT CAM CONVERSION | |
| 24502586 | LT-4 Hot Cam, hydraulic steel roller designed for showroom stock racing. |
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| 12370839 | 1.6 ratio roller rocker arms. Required for the LT-4 Hot Cam. See Rocker Arms below for more information on these. |
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| Note: The ZZ4 comes with the rest of the LT4 HOT Cam Kit components. The camshaft and lifters are all that are needed to complete the LT4 Hot Cam conversion. | |
| SPARK PLUG WIRES AND LOOMS | |
| 12361051 | Spark Plug Wires - Chevy Bow Tie logo, Red 8mm spark plug wires, 90° boots. Routs over valve covers. |
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| 12361057 | Spark Plug Wires - GMPP Logo, Red 8mm spark plug wires, 90° boots. Routs over valve covers. |
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| 12496806 | Wire Loom Kit - This is the ZZ430 wire loom kit. Has six support that are made of stainless steel with the Chevrolet Bow Tie cut out of the center of them with the use of a laser cutter. |
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| 1120C | R&M Center Bolt Wire Looms - Chrome Plated Chevy Small-Block, Center Bolt Valve Cover, 1987 & Up (305ci, 350ci), No Logo, Billet Alum. These also come in 8 other finishes to fit your needs. The 1121 number series come with the R&M logo. (Page) |
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| 72141 | Moroso Center Bolt Wire Loom Kit - For 7-9mm wires, Red. Runs wires along valve cover and mount to the cylinder heads. Also available in Blue P/N 72140, Yellow P/N 72142, and 72143 black. (Page) |
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| SCZZ4LM | SBC Chevrolet Loom Kit - This kit was put together from individual GMPP parts and is offered as a kit by Chevrolet. This is an attractive alternative to more expensive wire loom kits. (Page) |
| GMPP TURNKEY KITS | |
| 12497698 | GMPP Serpentine accessory belt drive system - Deluxe with air conditioning compressor. Lots of info on this kit on our GMPP Fast Burn 385 Turnkey pages. |
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| 12497697 | GMPP Serpentine accessory belt drive system - Deluxe without air conditioning. The same as the Deluxe kit above minus the air conditioning. |
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| 12497869 | GMPP Serpentine accessory belt drive system - Base with brackets and bolts. The same as the Deluxe kit above minus the air conditioning, alternator, and power steering. |
| AIR CLEANERS | |
| 12342079 | Chrome 14” high performance air cleaner. (Sold as Proform 141-306) More Proform air cleaners are available that work. |
| VALVE COVERS | |
| 12497985 | Chrome-Finish Aluminum Valve Covers. These center bolt valve covers are approximately 1/4” taller that production covers. Any of the Proform short style valve covers will also work with the stock ZZ4 1.5 ratio rocker arms. |
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| 24502540 | Valve cover adapter. Allows use of flange (rim) mount valve covers on center bolt style heads. Required when roller rocker arms are used, in many cases. (Page) |
| CARBURETORS | |
| 12485506 | Holley 750 cfm carburetor. Holley model 4160, polished finish, center-hung fuel bowls, dual feed, vacuum secondaries, automatic electric choke. Bolts and gaskets included. |
| ROCKER ARMS | |
| 12370838 | 1.5 ratio roller rocker arm kit. Aluminum, self-aligning, accomodate up to .575” valve lift, trunions have been machined for use with early model 3/8” rocker studs. Incudes 16 rockers, 16 nuts, and instruction sheet. |
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| 12370839 | 1.6 ratio roller rocker arm kit. Required for the LT-4 Hot Cam. See LT4 HOT Cam Conversion above. Aluminum, Self-aligning, accomodate up to .575” valve lift, trunions have been machined for use with early model 3/8” rocker studs. Incudes 16 rockers, 16 nuts, and instruction sheet. Note: Always check for push rod to head clearance and valve cover clearance when changing from 1.6 ratio rocker arms from 1.5 ratio rocker arms. |
| OIL FILTERS | |
| 25160561 | GM / ACDelco - PF1218 (Long) The ZZ4 crate engine does not come with an oil filter. |
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| 25324052 | GM / ACDelco - PF454 (Short) The ZZ4 crate engine does not come with an oil filter. |
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| 03952301 | Oil Filter Adapter - Fits all SBC engines from 1968 and up. Required on the ZZ4 for oil filters but it does not come with the ZZ4 crate engine. |
| GENERAL PARTS | |
| 12355612 | Street performance fuel pump. Used on carbureted engines. Pump has 7 psi shutoff pressure and a free-flow rating of 110 gph. |
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| 12497316 | Transmission Controller - Fully programmable controller, wiring harness, software, and laptop computer hookup for use with the 4L60-E, 4L65-E, 4L80-E, and 4L85-E automatic transmissions. |
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| 12368084 | Engine Oil Primer - Used to lube engine bearings prior to starting your new crate engine. |
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| 19138062 | Distributor Vacuum Advance - This GM heavy duty 10° vacuum unit has a strong spring, preventing advance until the engine has at least 7” of vacuum available. It is rated as 7.5” HG start and 12.5” HG end. Notes: Distributor P/N 93440806 distributor comes with the 20° vacuum advance with the light spring that starts at near 1” HG and should be replaced with this HD 10° one. Hook the advance unit up to ported vacuum. |
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| 23011420 | Magnetic Oil Drain Plug - This magnetic drain plug helps to reduce engine damage by capturing and holding small pieces of metal in the engine oil which are easily cleaned off the plug during oil changes. |
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