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P.S. · 10-29-2018, 10:54 AM

I recently installed a Best brand kevlar (they call it graphite) head gasket on a Model A. I followed all directions exactly. No water seepage, however when pulling a hill in 3rd gear at 45 MPH or so, the combustion gasses are getting into coolant and blowing the water out the radiator overflow.

Yes, I have re-torqued it (read above where I followed ALL directions). The block/head are flat.

Going back to copper gaskets. No problem with those.

10-29-2018, 10:54 AM	#11
P.S. Senior Member Join Date: Jul 2012 Location: California Posts: 1,696	Re: Copper head gasket or best Kevlar? I recently installed a Best brand kevlar (they call it graphite) head gasket on a Model A. I followed all directions exactly. No water seepage, however when pulling a hill in 3rd gear at 45 MPH or so, the combustion gasses are getting into coolant and blowing the water out the radiator overflow. Yes, I have re-torqued it (read above where I followed ALL directions). The block/head are flat. Going back to copper gaskets. No problem with those.