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It's a B234 head on a B230 block.
The 16V B234 motor came only in 89 and 90 740 GLE models, and the 91 940 GLE model. It was a somewhat short lived experiment, a sort of sneak preview of the head that later appeared (in 5 cylinder form) on the 850 motor.
I had lots of fun with the tweaked turbo motor in my 245, eventually had a little too much fun (25 psi of boost, some pinging, some bent rods) and blew up the motor. So onward and upward, I build a much stronger bottom end (H beam rods and forged pistons) and put the 16V head on top.
The whole 16V motor isn't easy to put in a 240 - it would take custom motor mounts, and some sort of distributor-less engine management system. Just putting the head on top of the B230 block that fits into the car solves some problems, leaves some others. Some notable issues - intake manifolds don't fit, turbo exhaust manifolds don't really exist for practical purposes (there are a few odd factory manifolds made for certain Euro markets, but they're very rare). And you need something to tension the timing belt (B230 has the tensioner on the head, B234 has it on the block, combination of B230 block and B234 head has neither).
All in all, not that hard of a project, depending on your level of wrenching. It's getting off the bolt-on realm of mechanicking, though. But Yoshifab's bolt on tensioner kit, for example, makes it easier now than it used to be.
New 16V turbo makes more HP on less boost than the 8V eve did (even when it was trying so hard it blew up). It dynoed 304 hp at the wheels (which is something like 330, 340 at the crank) a couple of months ago. Car runs low 13's when I take it to the track.
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'63 PV544 rat rod, '93 Classic #1141 245 +t
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