AiResearch/Garrett M10 t4 (pics added now)
#16
It's a TO4B. Expect the compressor (inducer) to be either 54.5mm, 48.4mm, or 46.5mm. The TO4B-H is closer to 60mm at just over 58mm, but I've only seen it in the .70 a/r TO4B compressor cover. I can't see the compressor wheel in the pictures, but IB it's either an S or V trim as those are by far the most common compressors in those era TO4B's. TO4B's did come with larger compressors (IIRC the 60-1 is actually a TO4B compressor) but not in the .60 a/r compressor cover. The 60-1 is just over 59mm and I have a really hard time thinking you can find a larger to4b compressor wheel than that.
#18