Yenko 427 Engine Information

[William]

No ZL-1 Camaro had a Yenko block.

Chevrolet produced the last production ZL-1 block castings [3946052] early August 1969. Lockport [LC] did some 053 castings in the late '80s.

The 2025 Chevrolet Performance catalog still lists an 053 block casting, much improved over the original.

The 3946074 head was produced into the '70s.

[luzl78]

Originally Posted by William

No ZL-1 Camaro had a Yenko block.

Chevrolet produced the last production ZL-1 block castings [3946052] early August 1969. Lockport [LC] did some 053 castings in the late '80s.

The 2025 Chevrolet Performance catalog still lists an 053 block casting, much improved over the original.

The 3946074 head was produced into the '70s.

William, I was looking for the 053 block,couldn’t find it. Do you have the part number for that block? Thanks. Jeff

[YenkoBird]

Originally Posted by William

No ZL-1 Camaro had a Yenko block.

Chevrolet produced the last production ZL-1 block castings [3946052] early August 1969. Lockport [LC] did some 053 castings in the late '80s.

The 2025 Chevrolet Performance catalog still lists an 053 block casting, much improved over the original.

The 3946074 head was produced into the '70s.

Since this is a complete motor, with a early Yenko block, would I assume it came out of a car Don had replaced the motor with. Did he sell complete motors in the 70's. My gut tells me this could be a late 68 or 69 motor but will search for some identification on it. It just has all the parts from a full motor that Chevy would have put in the ZL1 except it has the Yenko block. So little information out there. I have also been told so many different things. Thanks

[luzl78]

What’s the casting date of the block and the heads?