Well with all that increased pressure then you will have heat and if there was a backup then a soft part will go. Piston rings are strong up to a point but with more pressure than they can handle then they will fail. I had a PCV issue on my 86.5 and it ended up the head gasket was marked this side up on the wrong side and the oil drain back holes ended up being PCV vents pushing the gasket out. But with that low number on your #5 it has to be the rings if they got hot enough it may have coked oil in the ring grove and stuck the ring all the way in it could happen seen it on chevys before with a guy running nitrous and a supercharger kinda crappy really.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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