bbc clearances

Tom Goldman · 11-19-2015, 12:19 AM

Like Alan said ,Piston is gonna kiss the head a little . I'd use a.050 or .055 " Cometic gasket .
I'm assuming it's the exhaust thats tight on the radial clearance , you can cheat a little and shift the head with offset dowels and avoid having to cut the pocket.
I did that more than a few times back in the old TRW piston days.
I've run valves that tight myself,but i wouldn't recommend it . they will kiss the piston .

11-19-2015, 12:19 AM	#3
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,477 Likes: 892 Liked 883 Times in 237 Posts	Re: bbc clearances Like Alan said ,Piston is gonna kiss the head a little . I'd use a.050 or .055 " Cometic gasket . I'm assuming it's the exhaust thats tight on the radial clearance , you can cheat a little and shift the head with offset dowels and avoid having to cut the pocket. I did that more than a few times back in the old TRW piston days. I've run valves that tight myself,but i wouldn't recommend it . they will kiss the piston . __________________ Tom Goldman 1500 SG , 1506 STK