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LS3 Crate Motor Build - Late Crate Update, Part 2

More Than 600 HP From A Pump Gas Small-Block With No Power-Adder? It's True. Check Out The . . .

By Richard Holdener, Photography by Richard Holdener

Modified GMPP LS3 vs 417 Stroker
The graph tells the tale, as the 417 stroker offered significant power and torque gains through the entire rev range, increasing the power output of the LS3 from 569 hp and 522 lb-ft of torque to 608 hp and 570 lb-ft of torque. The gains were as high as 50 hp and 60 lb-ft of torque elsewhere in the curve, but the solid torque gain is something that can be enjoyed every time you even tickle the loud pedal. Not shown on the graph is the fact that the new combination improved the idle quality (by nearly 1 inch of vacuum at idle). Having all that extra torque means less need to rev the engine, though the stroker pulled hard to 6,500 rpm and beyond. We can't wait to see what happens when we add boost!

PARTS
DESCRIPTION PN SOURCE PRICE
417 stroker assembly DEM417LS Demon Engines $3,225.00
Add stroker components* MISC Demon Engines 825.50
Comp hydraulic roller cam 281LRHR13 Summit Racing 396.95
Comp Cam valvesprings 26918 Jegs 174.99
Fast 102mm Big Mouth TB 54102 Morano Racing 558.99
Fast LSXR intake kit 146302 Summit Racing 949.59
Fast LSXR fuel rails 54023 Summit Racing 199.95
GM cam sprocket 12586481 SDPC* 28.59
GMPP LS3 crate engine 19201992 Summit Racing 7,440.39
GMPP L76/L92 CNC heads 88958698 Pace Performance 1,388.50
GM LS3 controller kit 19201861 SDPC 1,506.39
GM muscle car oil pan kit 19212593 SDPC 125.80
GM harmonic balancer 12620556 SDPC 103.19
GM Y-Body accessory drive 19155067 SDPC 825.85
McLeod LS flywheel 460535 Summit Racing 425.30
Yella Terra Rockers 4172345 Yella Terra 399.00
FAST XFI 301000 Summit Racing 1,649.95

*Includes ARP head studs, Fel-Pro MLS head gaskets, new timing chain, and oil pump.
**Scoggin-Dickey Parts Center

SOURCES
Scoggin-Dickey Parts Center
5901 Spur 327
Lubbock
TX  79424
800-456-0211
http://www.sdparts.com
Demon Engines
Sante Fe Springs
CA
562-694-2559
www.demonengines.com
FAST (Fuel Air Spark Technology)
3400 Democrat Road
Memphis
TN  38118
877-344-8355
www.fuelairspark.com
L&R Automotive
13731 Bora Drive
Sante Fe Springs
CA  90670
562-802-0443
www.lnrengine.com
Comp Cams
3406 Democrat Road
Memphis
TN  38118
800-999-0853
http://www.compcams.com
Probe Racing
2555 West 237th Street
Torrance
CA  90505
310-784-2977
http://www.probeindustries.com
Chevrolet Performance Parts
P.O. Box 33170
Detroit
MI  48232
800-577-6888
http://www.gmperformanceparts.co
m
E3 Spark Plugs
Ponte Vedra
FL
http://www.e3sparkplugs.com
McLeod Industries
1600 Sierra Madre Circle
Pasadena
CA  92870
714-630-2764
www.mcleodind.com
Procomp Motorsport
Rialto
CA
909-605-1123
www.procompelectronics.com
By Richard Holdener
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