[Ron61]

Basically a Service Block for any type engine is new ones that the companies made the year of the cars they came in for replacements in case the original engine blew up or had a defect in it. They won't have the codes that tell which car or truck they came in as they had no way of knowing which vehicle may need a new engine. They are as good as the originals, just don't have the stamping on the block, so any person familiar with a car and it's date codes would be able to tell if the engine was the original one or not.

Ron