The main bearing bolts are tightened to 50 lb-ft (versus 85 lb-ft foriron blocks) to suit the physical properties of the die-cast aluminumblock. Antiseize compound is applied to prevent thread and shouldergalling. Chrysler testing revealed that if the thread engagement of thecap bolt into the aluminum is 21/2 times as long as the thread diameter,the bolt shank fails before the host aluminum. The special 1/2x13 capbolts are an inch longer than those used on iron blocks and featurereduced shanks to provide aluminum-compatible stretch characteristicsand to allow the passage of oil through the bulkheads to the mainbearings. Crankshaft endplay is 0.045, the same as an iron block.