289 Kaput - Next Steps Advice From This Great Forum

Discussion in 'Classic Mustang Specific Tech' started by 68conv5sp, Dec 20, 2013.

  1. Weak valve springs sound likely here. Do you have solid "before" tune up specs? Do you "know" what the timing and engine idle speed
    are? A spark plug that is not seated properly can also give weak performance, you might double check that, too...
    I think you can improve performance before you plan the rebuild. A couple of things that I preach often over the internet is to replace the stock timing gear set, and examine the balancer! Both can cause very hard to diagnose problems...