Going over some of my 1980 buildsheet's and referencing Bryan's page with the production total's..
http://monza.homestead.com/files/HBodyP ... bersWP.htm
I realized I have some number's telling me some thing's... Chevy report's list the total thru august, and don't have any data about the Extended Production run (assembly after 8/22/80)..
The last known Monza Buildsheet, in the extended period 10/15 has the last monza at 288,113. thats 18,695 Over Chevy's reported total.
It also put's the Monza total OVER the Sunbird total, so we now have Proof that the last H body assembled was indeed a Monza.
The last known Sunbird buildsheet's have the total's still LESS than the Total known, indicating Pontiac's number is All of them. With that info the buildsheet dates can be projected to the possible end of the run.
I'm off to work so I don't have time to re-write another post about the projected end of the line.. so I'm going to cut and paste a PM I sent to Bryan. Here it is:
""Well 1979 production- 305,041 by 12 is 25,000 cars a month capacity. Split monza's and Sunbirds about equally and you get about 12,500 each a month. Almost 20k monza's (18,695) for almost 2 months .. 8/20 to 9/20 to 10/15..does sound about right.
Both Sunbirds and Monzas were in the extended run... So it looks like the Sunbird number Pontiac released, counted all of them thru the extended time.
But Chevy only released the numbers through august. If this is true, then the Last H body was indeed a Monza.
-Cause the known total of Monza's is now higher than the Sunbird's.
I have an extended run Pontiac Buildsheet, and the total is Under the production total. That makes me think the Sunbird number was correct... might help up with a better approximation of when it all ended... a buildsheet I have at 10/13, list's Sunbird # 164,087..,thats 23,892 from the end. So at 12,500 a month, thats 2 months from 10/13 that production likely ended..
Or possibly right up to the Christmas / New years, holiday break at the end of 1980."
Makes decent sense too....If you had to rip out and re-arrange parts of the line you'd do it at a time when the plant is usually in hiatus, which was Christmas /new years time. When the plant was finally reset for the J cars by early spring, they could have started early on the '82's to catch up with the lull in 1981 models.