'68 Yenko, Transplant vs. COPO

[Kurt S]

I'd like to see a copy of the paperwork (could be helpful with our work on suspension and steering part #'s too), but one thought is the V78 is what cause the old style trim tag (with ACC on it) to be used.
Export cars used that same trim tag.

Kurt

[YENKO DEUCE REGISTRY]

KurtS;
Are you saying that the V78 could be for a different trim tag size or design??
M

[YENKO DEUCE REGISTRY]

Here is a pic of a what I believe is a Corvette L72 fuel pump. (Rowdyrat, confirm????)If it is, I can see why they would have to change it in order to put the L72 into the Camaro subframe. Could this be why they wrote the notes on the test paperwork?
M

[JoeC]

If the car used the L88's Holley 850 double pumper carb Chevy Engineering would probably specify the L88 fuel pump. The L88 fuel pump was probably in short supply since not many L88s were built and would have to come from the Corvette plant so maybe there was a problem getting the L88 fuel pump or maybe the Corvette L88 pump would not fit in the Camaro. It appears they just put in a fuel pump to make the car driveable then let Yenko worry about replacing it. A 1968 Camaro with a L72 427 equipped with L88 parts, an M22, and 4:56 gear would be a quick drag car. It's too bad Chevy didn't make the 50 cars required to qualify it for NHRA like they did with the ZL1.

[Chevy454]

When did GM start using the double pumper? Was it in '69 only? Weren't there availablity problems when the ZL-1s came out? Wasn't it Charley's ZL-1 that started out with a vacuum secondary because Holley hadn't delivered the 850s yet?

When did Holley start making the double pumper?

[JoeC]

I believe the 1967-68-69 L88 Corvette and ZL1 Camaro used the 850 Holley DP. When the Gibb/Harrell ZL1 went to its first race it failed tech inspection for not having the correct factory numbers on the Holley. It was discovered to have a 780 Holley on it instead of the correct 850 Holley. When Cars magazine tested Charlie's #3 ZL1 it had the incorrect 780 and still ran 13.16 @ 110.21. I'm surprised no L88s or ZL1s have shown up at the Pure Stock Drags. They sould be among the quickest factory built cars ever made.

[Edited by JoeC (04-25-2001 at 10:12 PM).]

[Chevy454]

Hassett had his ZL-1 at the FSCMDR in Ohio last year. I'm not sure if he's gonna have it back this year or not, or if he's bringing another car.

You out there, Mark?

[MrMotion]

My understanding of V78 mandatory is that export vehicles, especially the Camaros that were ordered for Canada, did not have to comply with air pumps or even having the L72 engines installed if the vehicles were ordered under COPO paperwork.

[Kurt S]

Marlin,
Yes.
V78 is defined as 'Plate, compliance, delete', which fits the Yenkos and exports.
In 68, any car that was exported got the old style tag with the ACC on the bottom like the Yenkos.
They did this cause the car did not conform to US regulations so they didn't want to put a tag on it that said it did. Always wonder how they handled this in the plant.
I think we (CRG) have about 5 export 68's documented so far - 3 in Chile, 1 in Brazil, and 1 in France (396 car). All have the ACC tag and some have documentation.
We also have info on 68's built in other 3 countries, but that's a different story....

[Edited by Kurt S (04-26-2001 at 11:09 PM).]

[Rowdy Rat]

Marlin,

The configuration of that fuel pump appears to be identical to the one installed on my 1969 (part number 6440482). I do know that during 1967-69 the L-88 Corvettes always received a different fuel pump than the other high performance big blocks although I haven't done any research to determine what the internal differences are. I can tell you that the external configuration is the same as the other Corvette fuel pumps used during that time period so if installation of the pump in the photo is not possible due to clearance in the Camaro subframe (DISCLAIMER - I don't know this to be true and have never attempeted this installation so I am going by Marlin's original statement), then the same would hold true with the L-88 fuel pump. If the "MV" code engines were originally slated to get the L-88 fuel pump along with the L-88 carburetor, I can see why the engineers would note this.

I have seen the fuel pumps installed on L-88 Corvettes (and one ZL-1 for that matter) as well as a couple of ZL-1 Camaros. The fuel pumps used on the two cars are VERY different in appearance; there had to be a reason for this.

I believed (like Joe) that the carburetors for the L-88s were all 850cfm models with mechanical secondaries and dual accelerator pumps. However, I'm beginning to think that this may only be true for the 1968-69 L-88s (and ZL-1s). I'm showing the original carburetor for the 1967 L-88 as part number 3886091 (Holley List R 3418 A) which is an 850cfm but with vacuum secondaries and a single accelerator pump. The 1968-69 L-88 carburetor is 3925579 (Holley List R 4054 A) which is an 850cfm "double pumper" (can you confirm these numbers Joe?). Kurt, you had mentioned in a previous post that Fran Preve knew the carburetor on the "MV" engines was changed to the L-88 unit. If you have the part number from the bill of materials, can you tell us which (if either) of these two part numbers was used?

Regards,

Stan Falenski