Gas Mileage???

Hello AJ/FORMS
If I would have known this before... I just changed my timing chain 2 month ago... also installed a chain tensioner... Btw.. what does ICA mean ? PV ( Piston to Valve clearance ? ) So my timing chain has 3 keyways.... before / neutral / after
in my case I have to put the key to AFTER right ?
Also called the shop that sells the aluminium heads....They said, they can make the Combustion camber bigger ( more cc ) so in case this opition is also still in the game
The owner of the shop is a well known Drag racer here in Germany...so he should know
what he is doing...

BTW... with my 3.23 my car makes around 65 mph @ 3000 rpm... that´s TRUCK territory here in Germany.... LOL
Greetings Juergen