Raw Casting ZL-1 Block
 

Raw Casting ZL1 Block on eBay

Is there any way the bids on this block could be real? Even if all the machining was done, wouldn't the block still not have cast in water passages?

Jason

Re: Raw Casting ZL-1 Block
 

Simply a display item..

Re: Raw Casting ZL-1 Block
 

That would be one expensive coffee table!
Buddy

Re: Raw Casting ZL-1 Block
 

I have records on many solid blocks that Yenko cast, typically for drag racers.A lot of that history is in my newest book.." The Yenko Era..
Continued. Canonsburg and beyond "

Re: Raw Casting ZL-1 Block
 

The cores in the cooling cavity of the block are usually made of silica sand,when the block is machined the sand exits from the frost plug and cooling holes.They usually go on a vibrating machine to loosen the particles of sand.Theres more to the process then i mentioned.

Re: Raw Casting ZL-1 Block
 

I see, that is interesting. Thanks for explaining.


Jason

Re: Raw Casting ZL-1 Block
 

They show a picture of the part number on the back of the block. But there is no casting date on the driver side of the block. Another tall Ebay story? It could be true. But event preproduction parts have casting numbers and dates. I checked my pictures of the block I had to confirm my suspicion.
https://www.yenko.net/ubbthreads/pics...7-im000169.jpg

Re: Raw Casting ZL-1 Block
 

I too would believe the core still has sand in it. Isn't there a way to check to see if there are hollow cavities? Tapping would surely give some type of indication.

Were the Aluminum blocks broached or did they use a rotary cutter?

Re: Raw Casting ZL-1 Block
 

There is no water jacket core - if the core was there, it would have printed at the freeze plug. Aluminum blocks were milled (rotary cutter)

Re: Raw Casting ZL-1 Block
 

A couple dozen unmachined raw castings were shipped to Smitty at Yenko Performance and Marine in the early 80's. My records indicate that he thought some racers might want to do their own block prep.
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