HOLDEN 253 304 308 RED BLUE BLACK JP DOUBLE ROW STEEL TIMING CHAIN SET # JP5979JP Performance Holden 253 304 308 V8 Double Row Timing Chain Kit # JP5979 All JP Performance Timing Chain Sets are supplied with induction hardened and multiple keyway crank sprockets (which have the keyways index marked for easier timing) and balanced camshaft sprockets and a true roller timing chain. Also all sets for engines without factory fitted thrust plates (i. e. Chev V8's and Chrysler big block V8's) are machined with a reverse oiler groove.