Hey Milo, i remember your post from awhile back asking about the 15B.
I havent got as far as mounting an engine in yet as im still trying to source a 15BFT. I could grab a F engine, and mount a turbo on it - but id rather wait for an FT. The FTE has more power as well as larger crankshaft main and big end journals, but the wiring headaches wouldnt make it worthwhile.
Did you find out which kind of engine it was that you sourced, a FT or FTE??? I've spoken to a few Aussie engine importers about the FT. They have sold a few, but they have all been sold and paid for before the container even lands in Oz.
As for mounting the 15B to a gearbox, i had heard/read several reports regarding the block bolt pettern. Some were saying it was the same as the other B series, some were saying it wasnt. Since this was the major deciding factor of using the 15B i decidied to try and reslove this myself. I managed to find a 15BF at a truck wreckers not far from where i live, so i wandered down with a BJ74 bellhousing only to find that it was a perfect fit (as seen in the photos above).
The way that i see it is if the landcruiser bellhousing bolts up to the engine, then a H55F can be used behind it (providing you use a gearbox from a 3B/13BT with the correct, longer, fine spline input shaft).
The 15B's have the M153 and M155 5 speeds, as well as the H260 6 speed behind them (possibly others). The clutch plate would quite likely have to be changed, as the truck gearbox would probably use a different spline size/count input shaft to the landcruiser gearbox - no biggie.
Another thing you may have to deal with is the flywheel. Some have an 11" flywheel, others have a 12". Its easy to tell which one the engine has, as the 11" equipped engine would be bolted to a gearbox which uses a one piece bellhousing (the engine in the photo with the bj74 bellhousing on it would have a 11" flywheel). While the engines that use a 12" have a two piece bellhousing, where a low profile housing is bolted to the engine first, followed by the flywheel. The gearbox and main bellhousing are then bolted up. The two piece setup is shown in the photos below of the FTE.
As far as i can tell the blocks are the same, so if you end up with an engine fitted with the 12" setup, it would just be a matter of removing it, and installing a 11" flywheel.
The main difference between a 14B and 15B block is the position of the piston skirt cooler oil jets.
The 14B, like all previous B's (except, i think the 2B???) have the oil jets pressed into the lefthand side of the block - as seen in the photo of the 14B. Whereas the 15B has the oil nozzles mounted on the underside of the block, secured with a threaded bolt (check valve). A similar setup to that used in the 2JZ-GTE and some 2UZ engines.
HTH
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