These A15's are only a paltry 300cc larger than the A12, but that represents a 25% increase in capacity & the big deal for me is the 12mm [half inch] increase in the stroke. That translates to a very usefull boost in torque, which makes the driving experience all the more pleasant, as Feral has quite rightly noted..
This engine will remain pretty much dead stock, but being a passenger car engine, my theory says that it should be more suited to passenger car use than a stock van engine.
As a side issue, i consulted my owners manuals for weight figures. [Power figures are conspicuously absent from Datsun literature]
The Stock 1974 Datsun 120Y four door, manual sedan weighs 775 Kg, while the 1980 /'81 Sunny Sports Wagon weighs 900 Kg, so the 125 Kg [275 Lb] reduction in curb weight that the A15 will see should translate to a performance improvement all by itself. WooHoo
[P.S. KB10's, the heavyweight in the B10 family, come in at 675 Kg.... na-na na na-na.
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Price? Well,.... lets just say that i paid less than i was prepared to pay,... & more than i would have liked to. It was an acceptable figure.