COPO 9511

[Nova Research Project]

hey 67L78conv,

I hope you have better production data on the Nova.

I only show:

G96 (3.55)
1968 = 3,017
1969 = 3,833*

*about 73% for total L78 production (if you assume none were installed in L48 or L34). Not really realistic, so 53% of all 396s. Which means absolute best case 1,429 had other ratio axles install. More realistic is 2,500 of L78's had other axles. Could this many L78's be 3.31 or 3.07's?

H05 (3.73)
1968 = 1,127
1969 = 0

G84 (4.10, 4.56, and 4.88)
Not listed.

Greg

[67L78conv]

As soon ass I dig the papers out I will let you know what I have. The lists are master accounting lists for all options both standard RPO and COPO options. In the case of the COPO options it tells me what vehicles the option was available on and the price but does not necessarily give the production totals for example it does not show the COPO 427 Camaro totals. If the rear end option has an RPO code like H05 even if it says COPO in the description then it will give me a total in 98% of the cases. If the option like G84 for special order gear ratio covers multiples like 4.10, 4.56 and 4.88 then it only shows the gross total and not a per gear total. These are broken down across each model and grand totals for all models.

Based on what I have seen from Camaro L78 production it would not surprise me at all if that many L78s were 3.55/3.31, 3.07 seems less common but I admit my overall data is not sufficient to draw any strong conclusion on it. A rough rating for overall gear ratio popularity when ordered would be most common to least 3.55, 3.73, 3.31, 4.10, 3.07, 4.56, 2.73, 4.88 when ordering the L78 package. A lot of people seem to have taken what was standard for the gear ratios on the engines for all first gens unless they knew what they were ordering or the dealer nudged them in another direction. Again this is more opinion than fact based on limited data and word of mouth from original owners.

[Nova Research Project]

Hello,

I did find evidence of what the Axle Code would display on Chevy documents.

Not a Nova but... Here is an example from ssl78396 back in '09 posted to this site.

1968 H05 3.73 Ratio



Just need a bunch more to see the others.

Greg

[Nova Research Project]

Hello,

In this thread over at Steve's, there is a Document that states the the 3.55 was not available on the Nova with the L78/M22 combo. It is dated 13 Sep 1968.

1969 Nova SS Documentation Thread Cool story and a few other documents.



Greg

[Schonyenko2]

I'd like to comment on the importance of this discussion. I, and I think may others have believed that you could order any rear ratio on a 69 Nova through 4.88 RPO. Not in 70 unless it was a COPO deuce.
The discussion now is that in 69 any ratio higher than 3.55 was a COPO order. That becomes significant as we all know how the COPO designation is thrown around to try to increase value.
The other issue relates to judging these cars, and what is now going to be correct, and accepted.
Is this an actual COPO specialty item, or is it determined to be like -- special pnt which is interpreted as a "special order" not a COPO order even though the order process is similar?

This is an important determination to make. I/we would appreciate any input anyone here might have. We want to get it right.

[WILMASBOYL78]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Nova Research Project</div><div class="ubbcode-body">Hello,

In this thread over at Steve's, there is a Document that states the the 3.55 was not available on the Nova with the L78/M22 combo. It is dated 13 Sep 1968.

1969 Nova SS Documentation Thread Cool story and a few other documents.



Greg
</div></div>


This is interesting...my 68 L78 Nova has the M22 with a 3.55 rear...really don't see the issue...if you could get an m21 the 1st gear is the same..?? certainly would be helpful to ahve the M22 with 4.10 or stronger gears...given what the car would probably be doing [img]<<GRAEMLIN_URL>>/burnout.gif[/img]

[Schonyenko2]

Please check out the post uhnder COPO USA on the DH Nova. It shows a BV coded rear that he states is original to the car.
So how do we classify this. COPO, or RPO?

[PeteLeathersac]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Schonyenko2</div><div class="ubbcode-body">Please check out the post uhnder COPO USA on the DH Nova. It shows a BV coded rear that he states is original to the car.
So how do we classify this. COPO, or RPO? </div></div>


Again click on this CRG F=Body chart, X cars too?.
http://www.camaros.org/pdf/options.pdf

'69 RPO G84 = 4:10 / BV
'69 Copo 9511 4:56 / BW
'69 Copo 9511 4:88 / BX


[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete