they say that a d15 can be reved like hell that is why the swaps work so well, but mine has around 225,000 miles and getting almost a new head on it. so what are the chances of the bottom giving out, my engine smokes a little when floored and when started but i sounds like head problems cause i can hear my vavles they sound real loose and my springs wore out as well, so that will cause it to smoke to cause of oil getting passed the valve seals right cause of how loose they are? concerned cause i paid $360 for the cam, 160 for the valve springs, 150 for the complete head gasket set, $1000 for the (d16z6 engine)(using just the head though) 130 for the obdo to obd1 jumper, all just to go the head swap. 87 crx si is my ride. any thoughts?