You hit he nail on the head!
It does ping on a hot day pulling off in first with the ac on and if i dont give it enough throttle,and comp did come up a little high, with 175 being the highest so all this lead me to believe it was shaved......also using 95oct on the stock ecu.
I guess compression hasn't raised by that much though because Nissan says it suppose to be 170 from factory, so surely 175 shouldn't make much difference.
I got the engine from the importers so god alone knows what the japs did, but i am thinking about putting in some forged pistons, freshen it up a bit and use a metal hg and i know the head has to be perfectly flat to use this so a wanted to know if it can be shaved again if the need be.
I dont have much knowledge in this area and i am not in Aus, and from my experience the builders here are not 100% trust worthy either and i cannot take their word for it, so when u say pull off the head and measure it....what exactly am i measuring???
Basically i just want to know if the head is within tolerance so i need to know if it has been shaved already,if so how much has it been shaved, and can it be safely shaved again
Also, only aftermarket gaskets are metal right??? so i must know if its a stock or aftermarket head gasket in there right now?
Thanks