We were swapping heads on an 6.0-liter iron block LS when two of the head bolts on each head felt strange. The torque wrench felt like the threads were pulling out of the block.

Nearly all LS engines utilize the same cylinder head bolt pattern, which is why the heads are so easily swapped around. Most have four 11mm bolts per cylinder (for a total of 10) along with an ...

This close-up shot illustrates the water passage and head bolt designs that were transferred to the small-block architecture. It uses four head bolts per cylinder, like a production LS engine.

Word of a DOHC LS conversion was spreading all over the 2014 SEMA show. Even in the booth next to Mercury's proprietary DOHC V8 with big-block proportions, the 4-valve LS heads were drawing a ...

One key difference is that LS2 cylinder heads allow more airflow as compared to LS1 heads. Further, the combustion chamber of LS1 has a volume of 67cc, which is larger than the combustion chamber ...