> As Bryan Little just posted, you will find
> the F54 block on both turbo and non-turbo
> engines. As you are correctly stating, the
> F54 block had some extra reinforcing
> inbetween the cylinders, in the water
> jackets that gave the block a little more
> strength. That is the only real difference
> bettween the F54 and N42 blocks,(some of the
> oiling holes may have changed, but it still
> works with older heads).
> Again, back to my post up above, not all
> turbo motors came with the F54 block. Nissan
> still had N42 blocks hanging around when
> they started with the F54, so you will see
> them intermixed. But for the most part, the
> 81-83 blocks will be a F54, or commonly
> refered to as the turbo block.
> But the response that said a 75 block could
> never have been a turbo is correct, 81 was
> the first year that Nissan produced the
> turbo. So I would imagine it is possible to
> have an 80 block on a turbo, but not a 75 -
> the first year of the 2.8.
> -Bob Hanvey
I will try to check the casting # today to see if it is F54. The guy I bought this engine from had a 75Z. He built it with flat top pistons, 10:1 comp., NISMO comp bearings, bolts, Blue Dot oil pump, total seal rings N42 head with competition porting and intake matched, Arizona Zcar SS valves,480 lift 272 dur cam. Says it was dynoed at 242hp at wheels, and had about 1000 miles on it. I supposedly got a Nissan competition gearbox with it. According to NISMO, the only way to tell a comp gearbox from stock is to open drain plug and look for steel syncros. This one has brass. NOT competition. I was suppose to get a turbo throttle body, Didnt happen. Intake was suppose to be honed for a larger throttle body. Cant see that it has been. Now after being told first that this block may not have been a turbo, and finding out all the rest of this, I have to question the validity of it being a turbo block. but like I said I will check for the F54 casting #. Thanks for your input.