They look like a tube fin variety, similar to Greedy. Which works OK for a long core FMIC style, but is not ideal for SMIC. They look to be a 10"x6"x4" core with 2" in/out lets & by the 4 stamped areas on top of the core it could suggest that its 2 cores mated together. The end tanks appear to to be formed with a roller for a stronger surface area so that the relatively large end tank will not distort under heavy pressure. Ducting will greatly increase the cooling efficiency of this setup.