Red Book engine # question

[CHILI]

How come my Porsche Red Book goes from starting engine # to ending engine # until 1978? Then it goes from the start # to "on"

Example:
1976-1977 K series engines
6370001 - 6373531

But then for 1978 and on it states stuff like:
6280001 - on

What gives? I was trying to look up 6451134 for a friend, but it makes no sense.

[1982911SCTarga]

I'm looking at my Red Book, and if the number's right, I think it's an '81 U.S. 930/16.

I don't have an explanation for the "XXXXXXX-on" thing.

It gets easier after '81, because the third engine digit was replaced with a letter designation that matched the car's program-year letter, as in "C" for '82, "D" for '83 and so forth.

Brian

[3.2 CAB]

"H" Series, 8/74-7/75 6450001-6452440 (911/43)

6451134 looks to me like it is a "H" series, 1975 model, 911/43. Tony.

[tonythetarga]

Originally Posted by 3.2 CAB

"H" Series, 8/74-7/75 6450001-6452440 (911/43)

6451134 looks to me like it is a "H" series, 1975 model, 911/43. Tony.

I concur.

[1982911SCTarga]

I stand corrected.

Brian