1966 427 engine suffix

[Jeremy H.]

I am looking at a 66 425hp car. Would the engine assembly date have a "I" or a "1" in th edate stamp?

Thanks
JeremyHedges (31711)

[Tom H.]

Re: 1966 427 engine suffix

Could vary by assembly date. I believe it could be either or possibly one of each. I believe this to be correct unless there is something unique on the 66's. Hopefully somebody will chime in if there is.

[Steven S.]

Re: 1966 427 engine suffix

I have pictures of examples with two "I"'s in the engine plant stamping, one in the date and one for the suffix. I do not have any pictures of legit examples with a date that would have required the use of two, maybe others can comment here, but I believe again it would have been the letter I. I have never seen an actual "1" used in the engine plant stamp on a '66 427.

[Mike B.]

Re: 1966 427 engine suffix

Hi Jeremy. I've owned my '66 L36 for 21 years now and the pad reads:

T 1I 26 IL 6107216

However, the "1" in the build date appears to really be a roman numeral "I" that is missing the upper right corner. It is identical to the "I" following it otherwise (November '65). I haven't figured out how to format my photos smaller to send in this thread. If you'd like, I can always e-mail some real nice closeups for you that show clear broach marks.

Take care,
Mike '65, '66

[John H.]

Re: 1966 427 engine suffix

Engineering directed that the "1" character be replaced by the "I" character in the pad stamps back in 1957; don't see 1's very often.