Current engine is B16a. Engine fully rebuild with blockguard, low comp piston, headstud and metal gasket. Head work is also cun no leaking, new valve seals. Cast iron manifold, oil feed from fuel press...
I'm quite sure there are alot of ppl using Toyota Supercharger pistons on their GSR or 4G93 BOT. I guess there are also alot of ppl using it on reboer 4G91 and also 4G92.