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Discussion Starter · #1 ·
Was pulling in the garage at low RPM then all of sudden bang, spring broke on exhaust side 8th cylinder. Ran like that for 5 seconds.

The bad part is the whole spring area fell apart and the rocker somehow hit the valve covers sending metal shaving of the valve cover everywhere. Valve was still up when the valve covers where removed but unknown if it had dropped and the piston simply slapped it back up?

Would metal shaving like this cause me to disassemble to find every piece and clean every valley.

What would you do? This is 347 stroker with 60 000 Km (not miles), burns oil through the intake from the pvc.

Any tips on where to start would be great.







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Discussion Starter · #5 ·
Thanks

Been looking at everything on what could of caused the spring to break. No evidence of binding or over tension, weakness or even rust spots. Just a clean break due to maybe age. Who am i trying to fool, if I dont dissasemble I will be worried I missed some of the metal shavings all the time.
 

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Discussion Starter · #7 ·
Cam was comp cams custom from previous owner so unknown. (run for 4 years)1.7 Ford rollers with perfect valve contact pattern and GT40y heads. Comp cam push rods measured to fit. But seems that the push rod is slightly bent, maybe improper shim of the rockers.
 

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Discussion Starter · #10 ·
Thanks, I will leak down test and go from there. Gas is new and as always been kept fresh. Question: why would the rocker which did not hit the valve cover to start with all of sudden hit the cover after the broken spring. And if it passes leak down do i simply run a bucnh of oil through it and get as much of the debris out. New springs on the whole head of course.
 

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Discussion Starter · #14 ·
Im taking a guess as to simple wear and tear. Because nothing points firmly in any direction. Thank yoyu all for the advice given i belive I have a planned path to take based on your comments.
 

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Discussion Starter · #17 ·
Thanks, everything leads to take her apart and make sure. A 347 isn't cheap so I would like to keep the motor. I will let you all know what I find as to document the symptoms with the effects for anybody else looking for info.
 
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