ZL1 engine

[SuperNovaSS]

The mains were studed. There were head studs but they came in a box, not in the block. I will know better on the stamping when I pick up the block, but rpoz11 said he checked it over well and saw nothing. It did have a series of numbers opposit the casting number but I did not know what they meant.


Jason

[rpoz11]

Basically, this block appears to be a latter issue of the original from the original molds. I'd bet most that this was a early 70's re-issue based upon demand. As Ive heard, and Im NO authority on it, the original run was made, stopped after enough warranty blocks were poured, and then re-poured again later for a small final run. I did not see any VIN stampings on it whatsoever. With the smaller 2 in the 3946052 casting number, I will bet my Camaro on it that this was a 70-73 re-issue. The heads I think were 73 or 74 dated and the 163 was obviously not correct for it; I would like to allow the new current owner to finish off here on this since it is now in his hands.

[RichSchmidt]

I am not an expert on ZL1 dates and codes,but didnt later ZL1 blocks come without sleeves and use iron plated piston skirts?I believe after 1972.I dont know if the exact date or application for unsleeved blocks{I think the Can Am motors were unsleeved}but I know they existed.

[GMH454]

Good point. What is being discussed on this thread is the original casting for ZL-1s used in Vettes Camaros, and some racing teams, Penske, McLaren, etc.
After the first batch was done, some were put in cars, many set aside for warranty, others held back for over the counter, and others used for the chosen racing teams. I think Greenwood stated that he picked up the last 16 in around 74-75. After the first run the same casting was used to produce more blocks but beleive these were not dated as they were never intended for instalation in cars. Later Yenko used same cating to produce a series of Yenko blocks, and these have the snowflake altered in various ways.

What you are refering to is a Reynolds Block, designed for Can Am, although Grumpy used one in his 1970 Camaro. These should not be confused with ZL-1s.

[Eddie M.]

was the Can-Am block not machined for a fuel pump?

[GMH454]

Having never seen a Reynolds block I will pass on that.

[SuperNovaSS]

Got the engine back from the machine shop and there are no date codes on it. There is a series of numbers opposite the casting number but I don't see any way they could be a date code. I will post them tomorrow. If any one is interested in this engine please let me know, otherwise it will be going on EBay soon(probably tomorrow) . The heads pressure tested good. The block is also crack free. The crank is STD/STD.


Jason

[SuperNovaSS]

The engine has been listed on EBay. Here is a link. Good luck to all bidders.
ZL-1 Engine


Jason

[rpoz11]

Let me see if I can get these up... OK; As you can see in the top image of the Block, the date code, at least on my Block, was located above the pan rail to the left of the lower single bolt hole for the engine mounts. I cant speak for all ZL1.s made so I am sure the placement of this dating could vary Block to Block. Hope this assists all!

[COPO]

The date locations are the same as the ZL-1 block I had.