Test Motor #5-Wild 383 Stroker

Block: Stock (bored to 3.9020)
Crank: 4340 forged 4.0-inch stroker, Procomp Electronics
Rods: 4340 6.2-inch, Procomp Electronics
Pistons: Flat-top forged piston, Probe Industries (3.902 bore)
Cam: COMP 289LR HR14 .624. lift, 239/242 duration split, 114 LSA
Heads: TEA Stage 2.5 LS6 (1.72 roller rockers)
Intake: LSXRT
TB: FAST 102 mm
Headers: American Racing Headers 17⁄8-inch long-tube
Peak Power: 603 hp at 6,400 rpm
Peak Torque: 544 lb-ft at 5,400 rpm
Torque Curve: Exceeded 525 lb-ft of torque from 4,400-5,900 rpm

Like the wild 5.3-liter, this 383 version pushed the limits of driveability, but boy howdy did it make power. Using a 5.3L block, we bored and stroked the 5.3-liter to achieve a final displacement of 383 ci. Unlike the mild version that featured a static compression of 9.5:1, this 383 was sporting flat-top pistons that pushed the static compression ratio to 11.0:1. The elevated compression ratio was combined with a set of TEA Stage 2.5 LS6 heads, an aggressive COMP 289LR HR14 cam and FAST LSRXT (truck) intake. Wanting to maximize power, we even installed a set of 1.72:1-ratio aluminum roller rockers and swapped out the 1¾-inch headers for larger 1⅞-inch versions from American Racing Headers. The extra breathing paid off, as the 5.3L 383ci stroker produced 603 hp and 544 lb-ft of torque. Torque production exceeded 525 lb-ft from 4,400 rpm to 5,900 rpm, making for one sweet torque curve.

SOURCE
Trick Flow Specialties
1248 Southeast Avenue
Tallmadge
OH  44278
330-630-1555
http://www.trickflow.com
Lucas Oil
302 North Sheridan Street
Corona
CA  92880
951-270-0154
http://www.lucasoil.com
Comp Cams/Fast
3406 Democrat Road
Memphis
TN  38118
800-999-0853
www.compcams.com
L&R Automotive
13731 Bora Drive
Sante Fe Springs
CA  90670
562-802-0443
www.lnrengine.com
Total Engine Airflow
285 West Avenue
Tallmadge
OH  44278
330-784-4382
http://www.totalengineairflow.co
m
Probe Racing
2555 West 237th Street
Torrance
CA  90505
310-784-2977
http://www.probeindustries.com
Holley/Hooker
1801 Russellville Road
Bowling Green
KY  42101
270-782-2900
www.holley.com
Procomp Electronics
605 S. Milliken Avenue
Unit A
Ontario
CA  91761
909-605-1123
http://www.procompelectronics.co
m