'63 Impala, 409/425hp, Black on Red, Ex Reggie Jackson Collection

[MosportGreen66]

Originally Posted by L78M22Rag

That’s the worst attempt at faking broach marks that I’ve seen.

What Helmut said.

[Steve Shauger]

Originally Posted by MosportGreen66

What Helmut said.

Obviously someone scraped and damaged the pad. I believe the 409 did not have the traditional small/ big blocks, fore-aft broach marks, although there were circular machine markings. Hopefully a 409 guru can shed some light...

[tom406]

That is pretty sad, scratching lines with an awl or something. I went through this with Verne a couple years ago. Apparently the relatively small volumes of 348/409 engines didn't justify the expense of the big planing machine that did that operation for the small blocks (and later big blocks). Thus production used a rotary machining operation for preparing the 74 degree deck surface of the W motors.