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73ss454 · 06-25-2008, 10:28 PM

Yeah, the zinc thing is a real problem for flat tappet cars. But the tests on the new EOS proved it has about the same zinc amount as the old EOS. I haven't purchased any yet but will get some in a few weeks.

My car still has the original valve springs which after 35 years aren't putting too much tension on the cam so an oil change with a can of EOS should be fine.

If I were building a motor with a high lift and long duration I'd be much more concerned about zinc content. When starting up these race motors for the first time removal of the center valve spring to remove tension is recommended for the first 1/2 hour of running time.

06-25-2008, 10:28 PM	#31
73ss454 Thinks s/he gets paid by the post Join Date: Oct 2004 Posts: 2,144	Yeah, the zinc thing is a real problem for flat tappet cars. But the tests on the new EOS proved it has about the same zinc amount as the old EOS. I haven't purchased any yet but will get some in a few weeks. My car still has the original valve springs which after 35 years aren't putting too much tension on the cam so an oil change with a can of EOS should be fine. If I were building a motor with a high lift and long duration I'd be much more concerned about zinc content. When starting up these race motors for the first time removal of the center valve spring to remove tension is recommended for the first 1/2 hour of running time.