ZL-1 Block Marking Help

[SuperNovaSS]

I recently picked up a ZL-1 block and am trying to find out more about it. It is a large bore block that has cooling passages and a fuel pump boss. It had a winter's snowflake but was ground off by the original owner so the block would appear to be a cast iron block once painted. There is a stamping on the deck pad and by the oil filter that reads,"Jumbo's Racing Engines Torrance, CA".'Vince and Kim Jamara" is also engraved by the oil filter area. Under the timing cover is stamped SY and SY DJ as shown. The block has no casting date anywhere and has never been ground on or polished so there never was one.

Does anyone have any insight on any of these stampings? The rods were also engraved, "Jumbos".


Thanks,


Jason