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Original Message
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| RE: 428CJ, to rebuild or not? |
| By John - 10/11/2001 9:35:45 PM; IP 142.177.52.42 |
| From my limited experience, the main bearings are the problem, so as long as the engine is apart, you might as well go for the hardened valve seats. Only the exhaust valves need to be done, however if you are going to use the car for daily driving and don't plan to run it hard, you don't need to do the stellite valve seats. An acquaintance who works for an oil company tells me there is other additives that make up a lot for the absence of lead that are already in gasoline when you buy it, but if you run the engine hard it won't provide the same protection. Read up on all the oil gallery mods and do them to the block. The consensus is to use a HV oil pump (about 75 psi at revs or cold idle, about 20 at hot idle) Some people say to use a stock (cast iron, not aluminum housing) oil pump, but they are in the minority. Defiately don't use a HV/HP pump. Read up on bearing clearances...I say about 0.0025" for all bearings for a street motor. Use the specs that the pistons come with for them...add 0.001" for high performance use. Good Luck. |
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