Yenko 427 Engine Information

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**Kurt S** · #1 05-28-2025, 06:13 AM

It is not a 69 block.
Don had those Yenko blocks cast in the mid-70's.
GM did not let Yenko used the molds in 69 - the blocks were still in production.

**Tracker1** · #2 05-28-2025, 01:23 PM

You seem to have included a picture of your Trans Am's original Pontiac 400 cid engine casting number 481988 XX, which confuses matters.

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