WHAT DOES TOYOTA 4AGE BLACKTOP ENGINE FOR SALE MEAN?

Description New up to date design has far better clearance to be used within an AW11 MR2, now takes advantage of cylinder heads dowels for alignment plus more correct port matching!!I place bars on major and bottom to guidance the manifold and keep everything in line. as they taper I had ribs put on the end so a hose does not slip off.I tried tunin