My FJ40 has the reverse problem. Apparently a 1.5F block and a 1F head. I’m still investigating.You guys are great and have lead me in the right direction for things on here to search for. I looked at dozens of photos of different years of blocks, heads and head gaskets. Seems someone put a F1.5 head on the original F block. BTW I don't think I mentioned this is a but the 40 is 11/1970 and engine number is F 333 022. I think I may have the wrong head gasket since from photos it appears my engine has a coolant passage in the block where the F1.5 and F2 engines have an oil passage. So in my case the head Felpro gasket might be more of a universal fit POS (?) and joins my coolant passage on the block with the head bolt oil passage to the rocker arms on my F1.5 head. I think I just have to take it apart to find out. unfortunately.
For the head gasket, I keep reading in older post to use a Toyota gasket but it looks like they are discontinued now. Who sells a good gasket that is engine generation specific without combining holes generic fit
What happened to the FJ40? Are you transplanting FJ60 parts to the FJ40?Looks like both our PO's are backyard mechanic innovators. LOL An update to my saga, after spending all the time and $$$ on the engine, trans, TC, brakes, axle parts, tires, I ended up with a FJ60 chassis with a good running drivetrain newer tires and better looking rims than I had. Also has PS and disc which were future upgrades I had planned but would have been very expensive. So glad I found this 60 chassis, but wish wish the timing was prior to any work I had done.