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We currently have all of the SLP "ZL402" short blocks on sale -



12412M Crate-Engine Assembly, "ZL402" LS2 Aluminum Short Block (High Compression) $4134.99

The all-new ZL402 Gen IV LS2-based aluminum short block builds on the phenomenal success of our original ZL402 iron short-block. This new package uses the same race proven internals as its iron block predecessor but features the all-new LS2 block for weight savings of over 100 pounds. We've even increased the compression ratio to 11:1 (nominal) - the same as GM's new 500-horse LS7! Although designed primarily for use in late-model F-Bodies, Corvettes and GTOs, the aluminum ZL402 also makes a great choice for most street rods, muscle-cars and trucks. Best of all, it's sold outright, eliminating the shipping hassles and expenses of core returns.

This package is sold only in short-block form, minus manifolds, camshaft, oil pump, and other equipment. The advantage of this approach is it allows you to pick a combination best for you. SLP also produces cylinder heads and camshaft packages. We'll be happy to recommend the best combination for you.

ZL402 LS2 Aluminum Short Block Includes the following:
Built entirely from brand new parts
Sold outright, no cores required!
GM LS2 aluminum 6.0 liter block
402-CID displacement
4.000" Callies 4340 forged steel crankshaft, balanced to rotating assembly
4.000" SLP/Manley 2618 forged alloy pistons with -6.00cc dish (includes new rings and full-float pins)
6.125" SLP/Manley 4340 forged steel H-beam rods
Includes new, factory-installed cam bearings; Clevite rod and main bearings
11:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Capable of supporting up to 700+ HP
Meticulously assembled by SLP to OEM tolerances and specifications.
Includes all necessary accessories for retrofit into a Gen III-equipped vehicle
Oil pump, timing chain, camshaft, pans, plates, and covers not included.
ZL402 OEM-quality fender badges (pair).



12400M Crate-Engine Assembly, ZL402" LS1 Short Block (High Compression) $3819.99

The ZL402 LS1 based iron stroker short block is loaded with the kind of top quality hardware found in short blocks costing much more. It was the first choice for the experts at Car Craft magazine, who took an off-the-shelf SLP ZL402 stroker motor and produced over 575 horsepower, naturally aspirated.

Our ZL402 is built around a new GM LQ9 Gen III 6.0 liter block, a 4.00" forged steel crank, and 4.00" forged aluminum pistons.

This package is sold only in short-block form, minus manifolds, camshaft, oil pump, and other equipment. The advantage of this approach is it allows you to pick a combination best for you. SLP also produces cylinder heads and camshaft packages. We'll be happy to recommend the best combination for you.


Although designed primarily for use in late-model F-Bodies and Corvettes, the ZL402 also makes a great choice for street rods, muscle cars, and trucks. Best of all, it's sold outright, eliminating the shipping hassles and expenses of core returns.


ZL402 Iron Short Block Includes the following:
Built entirely from brand new parts
Sold outright, no cores required!
GM LQ9 iron 6.0 liter block
402-CID displacement
4.000" Callies 4340 forged steel crankshaft, balanced to rotating assembly
4.000" SLP/Manley 2618 forged alloy pistons with -6.00cc dish (includes new rings and full-float pins)
6.125" SLP/Manley 4340 forged steel H-beam rods
Includes new, factory-installed cam bearings; Clevite rod and main bearings
11:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Capable of supporting up to 700+ HP
Meticulously assembled by SLP to OEM tolerances and specifications.
Oil pump, timing chain, camshaft, pans, plates, and covers not included.
ZL402 OEM-quality fender badges (pair).


12401M Crate-Engine Assembly, "ZL402" LS1 Short Block (Low Compression) $3819.99

The ZL402 LS1 based iron stroker short block is loaded with the kind of top quality hardware found in short blocks costing much more. It was the first choice for the experts at Car Craft magazine, who took an off-the-shelf SLP ZL402 stroker motor and produced over 575 horsepower, naturally aspirated.

Our ZL402 is built around a new GM LQ9 Gen III 6.0 liter block, a 4.00" forged steel crank, and 4.00" forged aluminum pistons.

This package is sold only in short-block form, minus manifolds, camshaft, oil pump, and other equipment. The advantage of this approach is it allows you to pick a combination best for you. SLP also produces cylinder heads and camshaft packages. We'll be happy to recommend the best combination for you.

Although designed primarily for use in late-model F-Bodies and Corvettes, the ZL402 also makes a great choice for street rods, muscle cars, and trucks. Best of all, it's sold outright, eliminating the shipping hassles and expenses of core returns.

ZL402 Iron Short Block includes the following:
Built entirely from brand new parts
Sold outright, no cores required!
GM LQ9 iron 6.0 liter block
402-CID displacement
4.000" Callies 4340 forged steel crankshaft, balanced to rotating assembly
4.000" SLP/Manley 2618 forged alloy pistons with -28.5cc dish (includes new rings and full-float pins)
6.125" SLP/Manley 4340 forged steel H-beam rods
Includes new, factory-installed cam bearings; Clevite rod and main bearings
9:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Capable of supporting up to 800+ HP
Meticulously assembled by SLP to OEM tolerances and specifications.
Oil pump, timing chain, camshaft, pans, plates, and covers not included.
ZL402 OEM-quality fender badges (pair).

Orders can be placed online or by giving us a call at 1-877-482-9763. These items must be prepaid with a certified check or money order.

Have a good day!