Virgin Head, soon to be surfaced (unknown how much it will take to surface) and I already have the TT HG as recommended in the link below
also have a new GE HG .
Better street performace, 20psi and 93 octance, 30psi on e85
Parts on 2jzge:
415lph e85 walbro
stock pistons and cams
1. Are these calculations done from a virgin uncut head or surfaced?
2. How much can the head be surfaced before the compression is to high?
3. Can i stack the GE HG ontop of the TT HG to make up the difference in machining?