Re: 383 Update

[chymar01@xxxxxxxxxxx]

If I had an engine with one valve stem higher than the rest, i would suspect that a valve seat has receded, allowing the valve to go into the head too far. Or possibly that the car had a valve job in the past and one was replaced. But if the car was running fine before, and then developed this issue, I'd lean toward the valve sinking into the port due to erosion of the seat.
I would keep a close eye on that engine!

Mark

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From: "Jay" <shelby_nut@xxxxxxxxx>
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Sent: Friday, July 15, 2011 9:29:54 PM
Subject: 383 Update

 

Just an update on my 383 that had no compression on cylinder 7 with the rocker shaft installed, but did with it removed.

 

After removing, disassembing, inspecting, and reinstalling the lifters had no effect after they pumped back up, decided with another course of action.

 

I fabricated some shims today (knew I'd find a use for that old ductwork sooner or later :), installed them, torque the rocker shaft to spec's, did a compression test, 150PSI.  More than any of the other cylinders had, so I'll be checking the rest on that bank tomorrow out of curiosity. I suspect the head was milled at one time, maybe twice, and the valve just weren't closing all the way, particularly on cylinder 7 (that appears to have an intake valve whose stem is a little taller than the rest.

 

No ticky ticky, smoooothest idle it's every had, goes waay better. I can do a burnout now! Woohoo! 

 

It will be interesting to see if the compression has come up on the rest of the cylinders, if so, I'll be shimming the other side PDQ!

 

Jay

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Please address private mail -- mail of interest to only one person -- directly to that person. That is, send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!
 
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