390 valve lift: what is "safe"?



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390 valve lift: what is "safe"?

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#3 (permalink)

03-16-2006, 08:54 PM

blueovalfanatic blueovalfanatic is offline

CC Member

Join Date: Feb 2006

Location: Columbus, OH

Cobra Make, Engine: Shell Valley- 390 FE, 4 speed toploader, 3.50's

Posts: 249

Not Ranked

Thanks for the response, and I will take note of the info as I am trying to find out as much as possible about the engine, particularly heads, etc. Basically all I know about the engine is that they were supposed to be a somewhat conservative 335 HP.

I am concerned about valve lift on aftermarket cams. For comparison, I had a 73' 351C, and went with a cam with .563" intake and .534" exhaust, the advertised duration was 294*, but I have no idea what the duration was at .5 valve lift to compare it with whats available now. I was also advised by the builder who did the machine work that .563/.534 was "getting up there"- but thats for a Cleveland with the 2 bbl heads I was running.

I am wondering at what numbers do I need to really start paying attention to valve / piston clearance.

Again, thanks for any help.
Greg

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