What is the appropriate cylinder pressure for gas octane used in two-valve, wedge cylinder heads?
Provided you have good gas and good quench, 160 psi should work well. You usually figure one-half point compression advantage with an aluminum head. Running a cooler spark plug will also help to reduce the chances for detonation. What is the maximum oversize that the Chrysler 5.9L engine should be bored to? Chrysler says that its 1977 and later 5.9L engines should not be bored more than .040″ (1.02 mm) oversize. In a March technical service bulletin, AERA reported that beginning in 1977, the 5.9L block design was changed to a lightweight casting, consequently resulting in reduced cylinder wall thickness.AERA noted that the 5.9L blocks prior to 1977 were the same casting as a 5.5L (340 cid) engine, which has a 4.040″ (1.02.62 mm) bore. The 5.9L engine has a smaller 4.00″ (100.0) mm bore, and those blocks from 1971-’76 may safely be bored to .080″ (2.03 mm) oversize. Can you provide any information on how to identify cylinder heads on Mack E6 and E7 diesel engines? The Automotive Engine
