You're looking at what we used to call a "long block"- - - -a rebuilt engine plus a cylinder head, without sheet metal or accessiroes like intake and exhaust, water pump, harmonic balancer, etc. Commercial rebuilders used to sell them "exchange"- - - -meaning the customer stripped the peripheral stuff off and turned in the used "rebuildable core" so the rebuilder could do it all over again. Badly damaged engines that couldn't be rebuilt or had to have major parts replaced resulted in an extra charge being made by the rebuilder.
Jerry
