370ci LS Shortblock for Boost with Callies 8 CWT Crank

This short block is intended for light boost to about 1,100 crank horsepower. The Callies Compstar center counterweighted crank with stock stroke brings a lot to the party. Having 8 instead of 6 counterweights increases stiffness by 25%. Harmonics are reduced because each cylinder has its own two counterweights. These two factors combine to minimize crank flexing thereby protecting the block, bearings and rods from excessive wear and fatigue. We have seen that using 8 counterweight cranks essentially eliminates the uneven bearing wear that is often occurs in LS engines with the standard 6 counterweight crankshafts. Keeping the stroke at 3.625 inches brings its own set of benefits. A stock stroke engine revs up faster than one with a stroker crank. This helps turbos spool faster. Shorter stroke rotating assemblies are also inherently stronger. Think of snapping a short versus long stick. In our opinion, a seasoned block that we have precision machined, engraved and serialized on our CNC