I think that since the BHG happens at different times on different Supras, there probably weren't enough soon enough to issue a recall. Figure everyone drives around 10,000 miles a year, a 86.5 would only have about 60,000 miles on it when the MKIII was discontinued, and since most head gaskets blow later than that, I doubt there were many of them they dealt with.
But I do agree with you, batmmannn, they either get replaced already or they don't blow as easily as we all think. I've owned 3 supras (all of them with at least 150,000 miles on them, and one of them a turbo) and none of them showed signs of a BHG. I have a 89 Cressida (another 7MGE Toyota) with over 250,000 miles, engine runs excellent. And I have 2 friends, both with 2 Supras each (one has a turbo, the other 3 are N/A's) all around the 200,000 mile mark, the only one with a BHG is the Turbo model.
So, cliffnotes: Probably not enough BHG during production, so no recall. Boost+low gasket torque=BHG, N/A's probably not so much.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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