eBay Impala SS-427

[Belair62]

Verne can correct me but all 509 engines up to 1965 were a Q coded block. Frome the looks of the pad stamps it appears the scenario you speak of may have been true for those engines. After application was known the final letter was inserted...

[PeteLeathersac]

[ QUOTE ]
Verne can correct me but all 509 engines up to 1965 were a Q coded block. Frome the looks of the pad stamps it appears the scenario you speak of may have been true for those engines. After application was known the final letter was inserted...

[/ QUOTE ]

Bob....you must've both punched and stroked your 9'er to get it up to the 509??? . I know 409's are a Q suffix....are you saying they waited 'til the application was known to stamp the second suffix digit on these too? . I have a 348/409 under the back bench in the shop w/ XX suffix. . I haven't laid eyes on it in years but never found the XX on any listings and suspect this was a replacement unit like a CE....anyone know this one? ~ Pete

[Belair62]

OOps....yes by the looks of original stampings it appears the final letter of the suffix..i.e, B,C,A etc were done later...once Verne stops in he will set us straight...he can probably answer the XX question too...got a pic of that deck ?

[PeteLeathersac]

If the suffix application digit was being added after engine assy. this is sure news to me and glad we've beaten this one out! . As I've always understood the whole engine date/suffix was done w/ one gang-stamp hit....I wonder what all motors they did this added application digit on? . It's a good one to know too as a help spotting fake stamps since the dupsters would line up all the digits in one gang-stamp and Wham!
As far as the XX pad picture goes I'd have to move a mountain to get near it. . There's a whack of old racing snowmobiles in the way also old race car parts including a nose from a Kremer Bros. 962 Porsche....crazy what a fella ends up with! . I'd be interested what Verne knows though. ~ Pete

[Lynn]

Pete: I am not sure why some guys get all bent out of shape when someone posts pictures and questions authenticity. I agree with you, we have to question to get answers. I too am curious to see Verne's input on this one.

Too bad the tranny is long gone on this car, as you said, the partial VIN could be compared to the one on the engine.

Lynn

[Verne_Frantz]

Sorry, I've been away for awhile. All '61-'64 409s assembled at Tonawanda that were shipped to assembly plants had a suffix code beginning with Q. In '61 it was only a Q. I've sent Bob a couple photos of original block pad stampings which should illustrate the second letter being stamped later and a little out of line from the other characters. I've looked at a LOT of legit '09 blocks and can't remember ever seeing one that did not have the second letter out of line. I think that's good evidence to suggest that the "T0102Q" (for example) part of the stamp was done earlier in the assembly process, then when the final configuration and end application was determined, then the second letter was stamped. Besides changes of cams and pistons in the various short blocks, the final assembly of the engines could also include different brackets which may have been held under water pump bolts, harmonic balancers, exhaust manifolds, intakes, distributors, etc. I just don't know exactly "when" that first stamp was made.
As for the "XX" s, I believe replacement short blocks got that code (or lack of code). I believe if a complete engine assembly was purchased, it was stamped with the normal correct suffix, since it went through the same assembly line right through to the end before it was shipped. (it was a "spec" motor) Since short blocks weren't fully assembled, there was no way to know what the final configuration would be, hence XX.
I've also seen a few '65 409s with the J codes, and the same held true with them. The second letter was a little off. If I saw a "perfect" restored '62 '09 car and the full deck stamp was in line like it was all in one gang holder, then I'd be worried.
I don't know if you can pass that over to MKIV assembly, but it was a Tonawanda assembly practice through '65 on "W"s anyway......
Hope that helps....

Verne

[Belair62]

Thanks Verne ..Pete keep in minde we were talking about 409's. As Verne said , I don't think this would apply elsewhere unless John Z had an opinion on that.