My input.
I had mild head work done. Port and polish, 3 angle valve job, valve bowls swirl polished, swain coatings, etc... Anyway the BEST way to raise compression is with pistons. There is not a lot of room to work with on the cylinder head, so welding and reshaping seems like it would be a waste in comparison to the pistons. If I wanted a high compression motor I would def. contact Mike from Motivational and get a set of those pistons. Go with some custom connecting rods, and go from there. As far as valve train modifications, no one has really messed with springs and retainers yet. Mainyl because the GA16 has not been pushed to those limits yet (emphasis on the word yet). Be careful with valve springs because you can do more harm than good if you don't match them to the rest of the valve train properly. Oversized valves have also not been performaed to my knowledge. I will be testing my cylinder head within th next month, with as small as the ports on the GA16 are, I suspect it will respond well to the head work and JWT cams.
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