I was looking up air tubulance from the air cleaner to intake manifold trying to decide if if this is a worth while mod on non aspirated cars (love my turbo's and know it works on them).
Any one come across this idea of the groove, ground into the combustion chamber of a head?
It promises a cleaner burn extra H/P, less emission!
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It allows the fuel to burn futher away from the spark on flat to semi flat head
Personally working in the engine reco industry, i see it working for hight top semi/dome pistons. Or flat to semi flat heads with a flat top piston. Not so much on a turbo'ed/blown engine with decompression pistons(depending on the head casting).
Remember gridining out will decrease the compression ratio so you may need to shave the head/block to compensate.
Anyone tried this? Seen or heard off?