Join Date: Apr 2001
Location: Helena, MT
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Re: 351 Windsor rebuild
Blow-by is usually caused by worn rings, not worn heads.
The term blow-by is coined from compression "blowing by" the pistons.
Personally, I wouldn't spend the money on new heads only.
Do that, and the new-found compression from better sealing valves,
will most definitely fry the rings, and won't help the mains or rod bearings either. [img]images/graemlins/frown.gif[/img]
Have you checked the PCV valve lately? Could be plugged.
Do yourself a favor, and perform a compression check first.
Get a leak-down tester, (some stores will loan or rent them) and see what shows up with that as well.
Once you have compression and leak-down numbers, you'll get a better idea of what components are worn.
I'm a firm believer in the rebuild everything at one time only philosophy. [img]images/graemlins/wink.gif[/img]
You're only asking for trouble if you do it "piecemeal" style.
Welcome to the forum by the way! [img]images/graemlins/grin.gif[/img]