ZL-1 Block Marking Help

[SuperNovaSS]

OK, that makes sense about the markings helping to ID the block. I was not too worried about the snowflake either but it is a bummer that is is gone. It probably took a few minutes to remove(for the same reason as yours) and will take many hours to replace.


Thanks again,

Jason

Here are a few pictures of other parts that were on the short block if anyone cares:

Factory deep sump pan converted to dry sump:





Summers Bros timing cover and GM aluminum waterpump with reduced inlet:



Chrome balancer of some sort:






Electric water pump drive motor and dry sump oil pump:

[SuperNovaSS]

Heavy weighted crank:






Pistons and Rods:

[iluv69s]

Jason, that is a bummer about the snowflake..that is what everyone always wants to see.

I hate to say anything is typical, but here goes. The cast letters on the rear flange and the stamped YS on the front are typical of Yenko blocks I have owned in the past.

I have owned yenko blocks with screw-in freeze plugs, and with push-in freeze plugs. Ive owned and them with a snowflake (with the L), with a YENKO letters cast in it, and also with the YENKO crest cast in it. So I hate to say 'typical' when it comes to these blocks !!

I have seen legit GM blocks with no date codes in them like this also....Just to check, are they aftermarket main caps? hard to tell by the pics. Any stamped numbers in them?

whats with the oil filter? never saw one like that? thats for the dry sump?


max

[SuperNovaSS]

Max,

The main caps are aluminum and I assume they are aftermarket. They are simply stamped 1,2,3 and 4 to mark their positions. The other ZL1 block I have has cast "964" caps like cast iron blocks have.

The oil filter is a System 1 unit with a removable mesh filter element. These are still available but I'm not sure if the design is the same as this older model.

I was told this block was purchased from a Chevy dealer 69 but the original purchaser has passed away so there is no way to verify.


Thanks,

Jason

[SuperNovaSS]

Max,

The main caps are aluminum and I assume they are aftermarket. They are simply stamped 1,2,3 and 4 to mark their positions. The other ZL1 block I have has cast "964" caps like cast iron blocks have.

The oil filter is a System 1 unit with a removable mesh filter element. These are still available but I'm not sure if the design is the same as this older model.

I was told this block was purchased from a Chevy dealer 69 but the original purchaser has passed away so there is no way to verify.


Thanks,

Jason

[SuperNovaSS]

Here is a link to the System one filter:

System One filter

It looks like they are now plastic rather than aluminum.

Jason

[Fast67VelleN2O]

Cool block!

[SuperNovaSS]

Thanks Matt.

Here is a picture of the cam end. I have a inquiry to Isky to see what the specs are.





Jason

[Bryan Matthews]

I know this is an old thread but I just found it and wanted to add some information.

Back in the very late 1970's and early 1980's my stepfather raced at Terminal Island/Brotherhood, Orange County International Raceway OCIR and at Pomona. He met and teamed up with Vince "Jumbo" Zamora. Jumbo drove a Red El Camino. I believe it was a 1970. I seem to remember it having a custom weight shifting mechanism in the bed.

I don't know the details but apparently some shady business dealings occurred and Jumbo cheated or stole from my stepfather. Not sure if it was in the form of money or engines or parts.

I now own the car my stepfather raced. It was an all steel full body 1929 model A Ford called "My Mistress". I'm attaching a photo of it in case anyone has interest in the history associated with this story.

I know that doesn't have anything to do with your engine but I wanted to shed some history on Jumbo's Racing Engines in Torrance, CA.

[Igosplut]

Originally Posted by iluv69s

I believe that is a later 'Yenko' block. They made big-bore and high deck versions. Ive seen them with a snowflake but I believe typically on a Yenko block, it would not have a 'w' for winters..If I recall it would have had a snowflake with an L... going by memory

LC for lockport foundry.