390 Done
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
If the valve is sticking part way open that could do it too. I was only thinking back to when I had my 390 heads done. They put in the hardened exhaust valve seats, but they were all over the place in terms of height! I can safely say a non-adjustable valvetrain would have been a disaster with those heads like that.
Also, IIRC the FE requires a bit more valve to guide clearance than other motors. Perhaps the shop where the heads were done left 'em a bit too tight and that is causing sticking? Maybe also causing a bent pushrod? I had this happen too...
Also, IIRC the FE requires a bit more valve to guide clearance than other motors. Perhaps the shop where the heads were done left 'em a bit too tight and that is causing sticking? Maybe also causing a bent pushrod? I had this happen too...
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
Just for _-_-_ 's and giggles lay a straight edge across the valves tips with the rocker assembly off if you find yourself in a position to do so.. Are all the tips at least close in height ? If that one is way low tap the valve tip with a hammer (be careful-wear goggles) and see it it frees it.
Thread Starter
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Senior User
Joined: Aug 2005
Posts: 465
Likes: 0
well i was away all weekend and will be tearing into the truck tonight to see what is going on. I was also looking at the adjustable rocker arms setups and was wondering do i have to get all new everthing or can i just install adjustable rockers onto my old shafts. Thanks
