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Our block arrived with OE powder metal pain caps and installed cam bearings.
Our bores’ center distance measured 4.400″, which met the OE spec.
This blueprint drawing shows cam-to-crank centerline as 124.08mm (4.885″) and deck height (crank centerline to deck) as 234.7mm (9.240″).
The rear of the block features already-drilled and tapped bellhousing bolt holes (10mm x 1.5) to accommodate the new style transmissions, but the block will accept an old-style Gen I Chevy bellhousing by drilling and tapping one extra hole in the blank boss, seen at the upper right in this photo.
The right rear of the LS2 block features a cast-in identification of “6.0L.”
The five main caps are powdered iron and are secured with six bolts each (four center 10mm x 2.0 bolts and two 8mm x 1.25 side bolts).
All of the LS engines feature the thrust bearing location at the center (No. 3) main cap.
The main cap center bolts are 10mm x 2.0 pitch. The inboard bolts feature a conventional hex head, while the outboard bolts feature a stud tip to accommodate the oil baffle. The outboard (stud-tipped) bolts feature a main shank length of 85mm, while the inboard bolts are 100mm long.
In our case, the main caps were easily removed by hand. A previously assembled block (where the main cap side bolts have been torqued) might require the use of a spreader bar to allow cap removal without damaging the cap-to-block mating surfaces.
Since the main caps use 8mm side bolts, in addition to the primary vertical cap bolts, pay extra attention to the care and cleanliness of the side bolt-mating surface on both the caps and the block.
A machined flat is featured on the block inner walls where the main cap accommodates the side bolts. Be careful to avoid damaging this soft aluminum surface.
This close-up shows one of the main cap side bolt holes. Flanged 8mm x 1.25 bolts are used here.
We checked each cylinder bore for roundness and were pleasantly surprised at the bore uniformity.
Our block apparently experienced a core shift during casting. Note how the cylinder liner shown here was bored off-center relative to itself. Bore centerline location seems fine relative to the block and main centerline. This simply indicates that we may not be able to overbore as much as we had hoped.
Pressure-equalization slots (crossover passages) are featured between the cylinder bottoms and the main webs.
Tags: LS, LS2, LS2 BLOCK, LS2 BLOCK DETAILS, LS2 BLOCK SPECIFICATIONS
