Day: 28

Some engine builders like to use API CJ-4 diesel motor oil as a break-in lubricant for new engines. That’s because it contains plenty of zinc (ZDDP) to protect flat-tappet camshafts. Apparently this oil is being replaced with a new formulation, API CK-4 and CK-4/SN (SN means the oil meets current year API standards). And just

Tunnel ram manifolds made their debut in the early 1960s. The first ones were actually small block Chevy jobs patterned off a Rochester mechanical fuel injection intake manifold (drag racer Carroll Caudle should be credited for the invention). Soon after, a company owned by Ralph Ridgeway cast a commercial example, followed shortly thereafter by other