The Baddest GMPP Small-Block...
The Baddest GMPP
Small-Block Crate Engine
GM Performance Parts ZZ383/425 Crate Engine
PN 12498772
GM Performance Parts' new ZZ383/425 engine packs big-block torque in a small-block package. With 460 lb-ft of torque at 4,500 rpm, the ZZ383/425 engine is GM Performance Parts' most powerful small-block crate engine. With all that torque and 425 hp at an incredibly low 5,400 rpm, the ZZ383 engine is an ideal source of power for any highly modified small-block-powered Corvette.
Recently, we had the opportunity to meet with the brass from GM Performance Parts at the Performance Racing Industry show in Indianapolis. We were pleasantly surprised that most of the components introduced have perfect affinity with your Corvette.
Better, Bigger Big-Blocks...
Better, Bigger Big-Blocks
GMPP Bow Tie Sportsman Big-Blocks
PNs 25534362, 25534363, 25534364, and 25534367
If you're looking for big cubes, GM Performance Parts has what you need: a new line of Sportsman Big-Blocks. These blocks are identical to the GMPP CNC big-blocks, except these come with nodular-iron caps and Grade 8 bolts for a more economical price. There are several improved features over other performance blocks, including a fuel-pump boss, clutch bosses, and an oil sender boss. They come out of the box ready to hone to a 4.500-inch bore, and can be bored to a 4.600-inch while still maintaining a 0.300-inch minimum wall thickness. Available in two deck heights, 9.800- and 10.200-inch, they are all machined for stroker clearance. And check this out: The lifter bosses allow production roller cams to be used.
Protect your valuable original big-block casting and enjoy driving your Corvette with this engine block as the cornerstone of your big-block Corvette's power.
Take a look at the accompanying products. For more information, contact your local Performance Parts dealer, see the GMPP Web site at www.gmgoodwrench.com, or call for your local GM Performance Parts dealership at (800) GM-USE-US.
Run Faster With Tighter Gear Splits
GMPP T56
Close-Ratio Transmission
PN 88958729
For those with six-speed manual-transmission-equipped Corvettes, GM Performance Parts introduces its new close-ratio T56 six-speed manual transmission. Equipped with tighter ratio splits between all gears, this transmission was track-tested and proven in Showroom Stock competition. It keeps your engine in its powerband under hard acceleration and deceleration, giving you the opportunity to go faster.
Additionally, owners of fourth-generation Corvettes equipped with the DNE 4+3 transmission will be able to swap this six-speed manual-overdrive transmission into their Corvettes, thanks to a transmission swap available soon from Keisler Automotive Engineering. For more information on the DNE 4+3 swap, contact Keisler Automotive Engineering at (865) 609-8187, or visit www.keislerauto.com.
New Valvetrain Tech for Chevy V-8s
First-Generation Small-Block V-8 Lifter Retainer
PN 88958652
Cam swaps can be difficult for Corvette owners. Now, thanks to GM Performance Parts, not only will you be able to change the camshaft without having to remove all of the lifters, you'll gain more lifter control on your Chevy small-block with GM Performance Parts' Qwik Cam lifter tray kit. For '92-and-later, Gen I-style GM small-block V-8 engine blocks, this product was developed from lessons learned on the development of the Gen III V-8 lifter guide.
GM's New Bad-Boy Cast-Iron...
GM's New
Bad-Boy Cast-Iron Cylinder Heads
GMPP Vortec Bow Tie Cylinder Heads
PNs 25534351 and 25534371
A couple of exciting new cast-iron small-block V-8 cylinder heads are now available from GM Performance Parts. Both heads feature dual-intake bolt patterns, allowing you to use Gen I as well as Vortec intakes, dual valve-cover bolt patterns, 65cc combustion chambers, and 2.00-inch intake and 1.55-inch exhaust valves. The PN 25534351 cylinder head is a heavy-duty version of the standard Vortec head with a 175cc intake port and 64cc exhaust port. The PN 25534371 head has larger ports patterned after the famous GMPP Fast Burn cylinder head, which yields a 206cc intake port and a 77cc exhaust port. These heads offer incredible flow at an economical price.
Regardless of your Corvette's generation, this is the perfect choice for adding performance to your small-block.
A New GM CNC Gen III V-8 Cylinder...
A New GM CNC
Gen III V-8 Cylinder Head
GMPP CNC LS6 Cylinder Head
PN 88958665
If you have a 4.8, 5.3, 5.7, or 6.0L Gen III V-8 (LS1-style) engine and want to improve the power output, bolt on a set of these new GM Performance Parts CNC-ported LS6 cylinder heads. The heads have the same CNC port as the GMPP 88958622 race heads, but the deck has been planed just enough to maintain the production 65cc chamber, giving a 10.5:1 compression ratio. Loaded with premium hollow-stem stainless steel valves, Cr-Si ovate wire valvesprings and other production components, these heads support 500-plus horsepower.
With the broad offerings from the performance aftermarket in 2004 of intake manifolds, camshafts, and fuel-system components, these CNC-ported, Z06-style heads are the perfect match for generating more power from any C5 Corvette.
GM's New Gen III V-8 Open-Plenum...
GM's New Gen III V-8 Open-Plenum Intake
GMPP Gen III Racing Intake Manifold
PN 88958675
GM Performance Parts introduces a new intake manifold for those who want to run their GM Gen III V-8 (LS1-style engine) with a carburetor or an EFI throttle body. Designed for high-performance applications, this open-plenum intake manifold has been extensively dyno-tested and has shown even exhaust gas temperatures across all the cylinders, which means it has even air/fuel mixture distribution.
If you're swapping an LS1 engine in your vintage Corvette, but don't want to use electronic fuel injection, this intake manifold is the part you must have.