[johnta1]

The Service Manual shows a '+' next to the YC not a dagger.








Being an early engine/block, there may be more people interested in it.
Later blocks were plentiful.
And possibly the people may like the early block compared to the later ones.
But it is not a 455 HO engine. The Engine code (YC) determines what was put in/on the block.
But everything can interchange to make that block what you want.

[caddor38]

Originally Posted by johnta1

The Service Manual shows a '+' next to the YC not a dagger.








Being an early engine/block, there may be more people interested in it.
Later blocks were plentiful.
And possibly the people may like the early block compared to the later ones.
But it is not a 455 HO engine. The Engine code (YC) determines what was put in/on the block.
But everything can interchange to make that block what you want.

Yeah I know i may have pissed some people off here but this is a topic i searched and searched and searched on before posting the motor for sale. Hopefully this thread can be linked and searched within google as this topic arrises again. People thought originally these motors didnt make it to A and F bodys and now we know yc motor were indeed installed in a and f bodies. Also it seems some were installed with HO components meaning higher compression pistons, heads etc.

However i clearly state this motor before the stamp and before the internals were put in was in fact the identical block as the HO as it was sitting there with 4 bolt caps and would make a nice replacement block for those gone extinct. Even this motor somehow getting a 4 boltmain and caps is a mystery and quite possibly the last 483677 motor built on Sept 10, 1970