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Re: how tell 429 or 460
429 and 460 blocks are the same. The 460 simply has a longer stroke with crank and pistons being different. First you need to know if the engine is running on all 8. It may be a simple as leads on incorrect plugs. Has the engine been running well for a while and just started this or is this a first time start up situation.
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Lance
71 429SCJ Mustang
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