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Well a better answer would be... Yes they did through silcone on the corners sometimes to help it seal better. I am not sure in japan but at least people do it here too as well so it ain't really that new. But make sure they weren't trying to seal the head or something hahahahh that would be g@y.... As for compression, it should average around 140 is around stock, and can range from 120 - 155 or something like that. I have a 1.2mm greddy headgasket and my compression is 120 even across.... Compression in all cylinders should not very more than +/- 3 psi. 3 is being generous, manual says 2psi, but I think 3 is fine too.
By the way, how the F would you know timing is off? Check your plugs, it WILL tell you.... G/L
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