With GM's versatile Gen III small-block gaining popularity as the foundation for a wide range of high-performance engine buildups, market demand for an affordable LS1 stroker package has become increasingly intense. In response, SLP Performance Parts has devised a revolutionary new Gen III stroker short-block assembly, one that offers unexcelled performance and durability at a truly accessible price.
Dubbed the "ZL-402" to reflect its beastly 402ci displacement, the package is chockablock with such race-proven hardware as a new GM LQ4 block, a 4-inch forged steel crank, and 4-inch forged-aluminum pistons. The benefits of employing a stock-bore iron block include greatly reduced cost as well as enhanced durability, all for a negligible weight increase of only 60 pounds over a comparable LS1 unit. With the right cam and heads and a properly tuned PCM, the ZL-402 is fully capable of producing over 575 hp and a similar amount of torque in naturally aspirated form.
This package is sold only in short-block form, minus manifolds, camshaft, oil pump, and other ancillary equipment. The obvious advantage of this approach is it allows each customer to formulate a parts combination perfectly suited to his or her needs. For those who prefer one-stop shopping, SLP offers a host of uninstalled options on an la carte basis.
Although designed primarily for use in late-model F-bodies and Corvettes, the ZL-402 also makes a great choice for owners of older Corvettes looking for an updated engine with tremendous power. Best of all, it's sold outright, eliminating the shipping hassles, protracted vehicle downtime, and additional out-of-pocket expenses associated with core returns.
Features* Built entirely from brand-new parts* Sold outright-no cores required* GM LQ4 iron 6.0L block (includes new bearings and block plugs)* 4-inch 4340 forged-steel crankshaft, balanced to rotating assembly* 4-inch 2618 forged-alloy pistons (naturally aspirated; includes new rings and full-float pin), or* 4-inch heavy-duty, low-compression, 2618 forged-alloy pistons (forced induction; includes new rings and full-float pin)* 402ci displacement* 6.125-inch I-beam rods* Includes new, factory-installed cam bearings* Available in 11.5:1 and 9:1 compression ratios (nominal; ultimate compression ratio depends on heads and gaskets used)* Meticulously assembled to OEM tolerances and specifications* Oil pump, timing chain, camshaft, pans,plates, and covers not included
Options* SLP CNC-ported LS1 or LS6 heads* SLP cylinder-head installation and gasket kit* SLP nitrated double-row timing chain* SLP high-performance oil-pump package* SLP spec-grind camshafts* LS6 intake manifold* SLP tuned-length long-tube headers (F-body and C5 applications only)
All options sold uninstalled
Projected List Price: $3,995