Lee, Andrew Jackman (on FB Ariel page) and I had great trouble sealing our heads with brand new, annealed, laser cut, solid gaskets on our '48 KG/KH Ariels. We both gave up and reverted back to NOS composite gaskets, which took a bit of time to track down. In my case, I found two: one from Malaysia and one from Australia but both took so long to arrive that I ended up annealing the original that came with the bike and fitting that. I've now done 800 mile since going back to this old gasket and no sign of any leak whatsoever.
I think half the problem are those ridiculous thin head nuts between the fins. With a solid gasket, there was no feel of squashing down a gasket, unlike the composite gasket. You're welcome to have my second, unused laser cut solid gasket.
Last edited by paul.wirdnam
on Wed Sep 11, 2019 8:05 am, edited 2 times in total.
'28 Model B (future project), '30 Model F, '31 SF31, '35 4F, '38 VB (abandoned project), '39 4G (current project), '46 VH, '48 KG