after you get that motor running good and all you probably can get away and add less zinc. I would think 3oz's would be ok for a stock valve train. I tend to run more(5 ozs) because of the engines I have built. one has a #18 another #20 and my drag motor #42 pound springs. with a stock spring them, little motors are pretty forgiving when it comes to cams not getting damage. the only time I have seen a Tecumseh cam damage is when the oil is never change and the oil gets so dirty it just grinds them up. with the billet rod you should be able to set the governor at 4000+ rpm's.
I know with a 16 pound animal spring a stock cam will pull good up to 4700 rpm's, but with a stock old spring it might try to float or what they call valve bounce.
where are you buying the lucas zinc oil. I have found it on ebay for just under $16 ship to my door and at the local parts stores for 20+tax
next time I get some I think I will buy 3 for under $40 ship to my door. comes out to just over $13 only and I just use good old SAE 5w-30 no brand name for under $3 a quart. that only add's up to about $7 for quart of zinc oil for my engines and you only use 20oz's of that....
I know with a 16 pound animal spring a stock cam will pull good up to 4700 rpm's, but with a stock old spring it might try to float or what they call valve bounce.
where are you buying the lucas zinc oil. I have found it on ebay for just under $16 ship to my door and at the local parts stores for 20+tax
next time I get some I think I will buy 3 for under $40 ship to my door. comes out to just over $13 only and I just use good old SAE 5w-30 no brand name for under $3 a quart. that only add's up to about $7 for quart of zinc oil for my engines and you only use 20oz's of that....