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Re: Broken Exhaust Valve Spring
Im no expert on this subject, but heres my two cents worth. Could be misalignment between valve guide and seat or even a defected valve. I read an article in chevy high performance a while back that said as many as 1 in 5 valves have defects. Could also be an oiling problem on that valve spring or just a defected valve spring. Were the springs new on rebuild or reused? Also...stock cam or high performance cam? Normally a high performance came will put more pressure on springs due to the higher lift on the lobes. I would recheck timinig also just to make sure that timing hasn't moved. I would tend to agree with you that the problem should be in one cylinder only, but might not be a bad idea to drop the pan for a bottom end check. The 230's run off gears and not a chain, so I wouldn't think that its in the front of the engine, but this is all my two cents worth. I dont think that Id try and turn her over again w/o a good look at the bottom and top end and checking timing set at TDC.
The only other thing I would check is the fuel system to make sure that you dont have a fuel issue that caused it to run rough also. Dirt or rust in the tank if it sat during the engine swap, filters..etc.
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