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GM High Tech Performance
Increasing Gen III Block Displacement on a Budget
Feb 9, 2004
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These BHJ honing plates are an excellent way to ensure repeatable honing procedures in every cylinder. In effect, the plates emulate the weight dispersion of the cylinder heads, making certain the bores remain as straight and true as possible during the process.
On the bottom side, HTC applies billet-steel main caps and secures them evenly with ARP studs and the factory torque specification.
To hold the price of the conversion down, HTC reworks the OE powdered-metal connecting rods for durability and strength. They are fitted with ARP rod bolts.
In the interest of longevity and durability, the stock LS1/LS6 rods are shot-peened and polished, and the big end is honed 0.002-inch oversize.
Upgrades include a forged-steel spiff, an HTC/Carrillo A-beam...
...and a more expensive Carrillo H-beam variant.
HTC reworks the stock LS crankshaft (right), streamlining the core, and subjecting it to an ionization process.
For $1,995, the ultimate application, HTC's E-4340 forged crank, as designed by Scott Bechtloff and Marty Cimaglia, packs more than 40 years of drag race, Winston Cup, and hot street experience.
A BHJ bolt-stretch gauge is used for properly setting up the connecting rod for resizing, obtaining the proper torque load when the bolt is installed in the engine, and monitoring the condition of the bolt while in use. Measure the length of the bolt in a relaxed (untorqued) state. Record the number. When it's time to tear the motor down, take another measurement. Anything greater than 0.001-inch stretch is reason to replace the fastener.
Budget variants includes the Speed-Pro hypereutectic flat-top pistons and OE pressed-in 0.945-inch pins. Static compression ratio with a 63cc chamber is 11.0:1.
Our piston upgrade is represented by CP/HTC dished-top forgings...
...Note the sly gas-port holes peppering the top ring land (arrows) that aid cylinder sealing by forcing the ring outward to the cylinder wall.
Mahle Motorsports offers a lightweight alternative for the HTC budget build. Though relatively new on the hot-rodding scene, Mahle has been the OE supplier to Porsche and other high-dollar imports for decades.
Thank guru Russ Hayes for this hot-off-the-forge Speed Pro piston...
...It carries PN L2621F and is available in 3.898- and 3.908-inch bore sizes.
Questions concerning the efficiency and longevity of Mahle products should be answered here. This piston was taken straight from a C5-R 427 Corvette that went the 24-hour distance at Daytona.
ARP is now producing connecting-rod bolts for the LS-series Gen III engine.
Hank relies on Speed Pro 152M main-bearing shells and PN 8-2555CP 40x2 connecting-rod inserts for all conversions.
In order for the reluctor wheel to work properly, it must be installed flat and straight on the crankshaft flange...
...A Goodson installation fixture attaches to the reluctor wheel and to the flywheel bolt hole.
Vector (HTC) harmonic balancers with 17 percent underdrive for the LS1 Camaro and Corvette (far left). The others are 7 percent underdriven for the same engines.
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