My neighbor has a stock 305 Chevy powered '40 Ford. For months it had a miss that defied all logic. Just showed up one day for no good reason. All ignition components temp replaced, diff carb tried, heads removed and inspected, rockers adjusted several times, etc. Finally in an act of deperation we loosened all the rockers to where there was some lash. The miss went away. This tells me that at least one lifter is stuck at full extension and won't bleed down. When adjusted normally at 1/2 turn past 0 lash it's holding the valve off the seat. I'm guessing the offending lifter(s) has a piece of dirt in it that is plugging an oil oriface and won't let the plunger compress. My neighbor wants to replace all the lifters with new on the old cam. I told him that stands a good chance of wiping out some cam lobes. I would narrow it down to the offending lifter, dissassemble it, and clean it. Anyone else have a similar problem with a hydraulic lifter?

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von '69 300 Dlx SS TC #15 ACES #1575 HSCA #5
My '69 SS (http://mywebpage.netscape.com/jerryacheson/vons69.html)

Von,
I had a hydraulic cam in my Heavy chevy way back when that did the same thing once in a while. I would let it sit for 15 minutes and it would be fine http://www.chevelles.com/forum/frown.gif I agree with you about not replacing the lifters. I know plenty of guys that get away with it, but if i did it the cam would probably wipe as soon as I started it ! I would also disassemble and clean the offending lifter. Someone told me once that the worlds best oil filter is a hydraulic lifter !

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Bill Koustenis
Advanced Automotive Machine
Waldorf Md

1971 Heavy Chevy - original owner
Team Chevelle #100

Thanks Bill. Gives me more ammo to convince him to clean it instead of replacing them all.

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von '69 300 Dlx SS TC #15 ACES #1575 HSCA #5
My '69 SS (http://mywebpage.netscape.com/jerryacheson/vons69.html)