Description:

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 CNCs is a far better foundation than a new block from GM. It certainly offers more value. We push these seasoned 6.0L iron blocks well over 1,000 hp with no problem as you can see in the videos below. That power level is way beyond the capabilities of a stock cast crank and powdered metal rods.

Diamond R Series pistons with a -15cc dish are standard. Flat top pistons are also available and work well running with either alcohol or NA on pump gas. The pistons are paired with Callies Compstar H-beam rods to complete the rotating assembly. Manley Platinum series pistons and rods may be used depending upon customer preference and availability.

The video below shows one of these 370ci shortblocks pushing out 1,063 hp on our dyno with ProCharger's new D1X system.

This video features a 370ci boost-ready short block putting out 1,148 hp on E98.

These short blocks are quick-ship items. We usually have one either on the floor fully assembled, or have fully machined parts ready to assemble. Call us at 815-725-2727 with any questions or to place your order.

NOTE: Timing cover, timing chain and oil pan shown in photo are not included, but may be purchased separately.

Want to hear from someone with one of our boost-ready short blocks in their car?  Here's David Ankin, star of the History Channel TV show ToyMakerz: 

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Block Machining Videos

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Block Customizing 

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