If the cylinder head on a 5.9l cummins with 312,000 miles on it were replaced with a new one to increase compression?
1 At 312,000 miles, everything that hasn't been replaced is worn out, used up, near kapoot. You're better off to go for a rebuild or a junk yard replacement. Matching up a 24 valve head to this older engine is asking for trouble.
You would have half the engine running on injector pump settings that were not meant for it. I would expect fuel mileage to suffer, or worse. If you have the money to monkey with this tiger, you have the money to buy something that works.
Most diesels are designed with just about the right amount of compression. If you go too high on the compression, you start to lose, as the extra compression takes extra energy input, which you don't get back, and it just heats everything up. The trend has been to go to lower compression ratios and improve the injection system.
Some direct rail injection systems use up to six injector nozzles per cylinder running at 28,000 PSI! More valves results in a bit more horsepower, as the engine breathes better and exhaust gases are better scavenged. It may be pricey, as you'll probably need new manifolds.
You'll have to balance the extra cost against the extra horsepower. If you never have needed extra HP, it will just be a waste of money.
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