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427 PCV Valve addltional info

July 1 2010 at 1:42 AM
Keith Ferrio  (Login kferrio)

My port side 427 (yes, the one that was just re-built) has been having a problem with oil smoke and during the diagnostic exercise, the PCV valve was called into question. I checked the valve out using the info from the previous posts including the pic posted by Paul and given that it looked OK and seemed to be functioning, it was dropped from the list of potential problem suspects. Along the way, I found some additional info that I thought might be interesting.

A Google search of the part number on the valve, C4ZE-6A666-A2, didn't turn anything up right away. But I did manage to find a few posts by some guys from a Sunbeam Tiger club Apparently the Tigers were equipped with a Ford 260 V8 and used a PCV valve set-up like the Chris Craft 427 (threaded PCV with 90deg. angle fitting). The post went on to explain that oddly enough, the valves were made by AC Delco. The part number they referenced was C4ZE-6A666-A1 (Ford #) with the Delco prefix of CV643C. Both the ..A1 and ...A2 were "later" part numbers and the Ford service number for both is supposedly C7AE-6A666-B.

I found only two listings, for the A1 part number, both on E-bay. One listing had a price of $99 for one NOS valve! The listing did provide application info that identified the 427 as a match for this part number. I also turned up an expired listing from March that had a more down to earth price of $10. I contacted the seller, found out she had three and purchased them all last week. Apparently these things are rare and I was lucky to find some at an acceptable price.

[IMG][linked image][/IMG]

The valve on the left is a $3 item from Autozone. It serves the same purpose and if you're not hung up on originality you can just delete the 90deg. metal angle and go with a rubber hose setup. You may want to consider a PCV hose with double 90deg. angles that will make for a better looking configuration. Here is one part number but I have not verified the length would be correct relative to the nipple on the carb and the port in the valve cover. (hose C6AZ-6A664-N). By the way, the valve cover grommets are readily available from Autozone/O'Reilly's/etc. in the miscellaneous parts section for about $4. So there is an easy and cheap fix for an old stiff or cracked grommet.

One thing I did notice was the spring in the new NOS valve was a bit stiffer than my old original and the $3 private label brand valve. I've read that the spring is calibrated to the engine but I'm not sure if a different/softer spring rate would be significant enough to affect performance.

There you have it. More than you probably ever wanted to know about an obscure but significant part for the 427. Where else but here on this forum!


427s (with shiny new PCV valves)

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Link to internal view of the PCV valve

July 1 2010, 10:31 AM 

Hi Keith,

Interesting research on a very obscure part for sure!
Good hunting, by the way.

Due to the inherent simplicity of the system, they really should last just about forever.
The risk of a bad one; if it gets stuck closed fumes can build up and if it gets bad enough it could explode the valve covers right off the motor in extreme cases. The more likely condition would be a very smelly motor. If one gets stuck in the open position it will be like not having a PCV valve at all, and you will still get good evacuation from the crankcase but it will tend to lean out the carb at idle especially. I have been able to tune my boat to run without PCV valves, but it clearly leans the idle mix and the boat doesn't like running slow at docking speeds as much. It is best to install the system as Ford intended.

[linked image]

Here's that thread with photos of the internal parts of the PCV system



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