OK, here is why I asked.. On looking at my newly machined 516 heads( just enough head mill to clean up ) closed chamber-- replacing open chamber heads, It appears that if the valve opens at approx. . 484 lift, the valves will touch the top of the stock piston. I haven't actually measured it yet, not sure how. Would you place a straight edge across the head surface at where the valves would be closest to the piston and then measure closed valves to top of piston would have .484* clearance? I don't want to assemble the valve-train and install head on engine yet. ...............................MO On Dec 6, 1:24 am, MO <mic...@xxxxxxxxxxxxxxx> wrote: > Back on track?.............MO > > On Dec 5, 12:18 am, Dodger7...@xxxxxxx wrote: > > > > > It would depend on cam lobe duration, but do not think that engine could > > ever run with that much duration,,,, > > > In a message dated 12/4/2011 11:58:45 P.M. Central Standard Time, > > > mic...@xxxxxxxxxxxxxxx writes: > > > are the valves ever open when the piston is > > at top dead center on any cycle ?- Hide quoted text - > > - Show quoted text - -- -- 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! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en.