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54mainline · 06-08-2025, 05:23 AM

I’ve got a 1954 Mainline with a 239 Yblock. Over the winter, I had the heads and deck machined. Yesterday, I finished the assembly, started her up and let her run for about 15 seconds. Afterwards, I noticed coolant weeping out of the head gasket on the drivers side above the oil filter.

Additional information that might be useful: I used the Felpro embossed metal head gaskets (dry) and head bolts were torqued to 75ft-lbs (spec) torqued in a clockwise pattern from center out. I have no leaks anywhere else.

I’m curious what advice this group has for my next steps.

06-08-2025, 05:23 AM	#1
54mainline Junior Member Join Date: Sep 2024 Posts: 7	Leaking head gasket I’ve got a 1954 Mainline with a 239 Yblock. Over the winter, I had the heads and deck machined. Yesterday, I finished the assembly, started her up and let her run for about 15 seconds. Afterwards, I noticed coolant weeping out of the head gasket on the drivers side above the oil filter. Additional information that might be useful: I used the Felpro embossed metal head gaskets (dry) and head bolts were torqued to 75ft-lbs (spec) torqued in a clockwise pattern from center out. I have no leaks anywhere else. I’m curious what advice this group has for my next steps.