Super Chevy – September 2019

22 SUPER CHEVY SEPTEMBER^2019

The iron 4.8/5.3L block supplied by Summit Racing (PN SUM-

150157) came cleaned, freshly machined, and ready for action.

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in bore size was combined with an increase in stroke, from

3.622 inches to 4.000 inches. This brought the finished

displacement up to 381.88 cubic inches, which we rounded

up to 382 cubes.

The 4340 forged steel crank and rods from K1

Technologies were combined with a set of forged pistons from

JE Pistons to produce an all-but-bulletproof bottom end. The

forged rotating assembly not only ensured plenty of strength,

but also extra power, and on pump gas no less. The reason for

this is that the 29.9cc donut-dished JE forged pistons com-

bined with the 64cc chambers employed on our TFS GenX

215 cylinder heads to produce a static compression ratio of

just 8.6:1. This boost-friendly compression ratio was chosen

for a reason, as not only did we employ extra displacement in

our quest for street power, we also decided the combination

would benefit from positive pressure. The only thing better

than displacement or boost is displacement and boost.

To supply positive pressure to our street stroker we

employed a ProCharger P-1X centrifugal supercharger. If you

are looking to make big power on a street engine with pump

gas, a little boost goes a long way. Since our 382 featured a

static compression ratio of 8.6:1, it was begging for boost. To

that end, we installed the ProCharger P-1X supercharger onto

the awaiting stroker. The P-1X was equipped with a 4.25-inch

blower pulley and, when combined with the 7.75-inch crank

pulley, the result was a peak boost of 9.1 psi at 6,500 rpm.

Remember, the boost supplied by the centrifugal supercharger

increases with engine speed. To allow us to run adequate

boost and timing on pump gas, we took the liberty of adding

an air-to-water (ATW) intercooler from ProCharger. This

dropped the inlet air temps by nearly 100 degrees, allowing us

to maximize the power output while maintaining a pump-gas

friendly tune. After tuning, the supercharged combination

produced peak numbers of 779.9 (780) hp at 6,500 rpm and

646 lb-ft of torque at 6,000 rpm. The combination of the

extra displacement and low compression and boost levels

allowed us to maximize the power output of our complete

street stroker, all on pump gas.

To prep for the extra displacement, the six-bolt iron truck block

was bored to the standard 5.7L LS1 bore size of 3.898 inches.

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In addition to the increase in bore size, we also stepped up in

stroke length. K1 supplied the 4340 forged steel stroker crank

(PN 012FAE40058). The heavy-duty 4.000-inch crank was

equipped with a 58X reluctor wheel. Both the crank and reluctor

wheel came core-hardened using nitride for increased strength.

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The crank was installed into the six-bolt block using Clevite

main (PN MS-2199H) and rod (PN CB663HN) bearings. Originally

developed for NASCAR, the Clevite H-series bearings featured

steel backings and enlarged chamfers.

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TECH PUMP GAS PUSH