68 BO7 Apprender 455 390hp carb and distributor question

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Old Apr 15, 2020 | 07:17 AM
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68 BO7 Apprehender 455 390hp carb and distributor question

Hello, new to the forum. Great site! I am having difficulty finding info on the correct numbers Q-jet for a 68 BO7 455 390hp. I see the 7028251 RJ listed for all 455 and 390hp H/O for 68 but nothing that specific, perhaps that is correct for my application or is it going to be such an oddball it would be difficult to find? Anyone seen an original as installed from the factory? Also looking for info on the correct numbers distributor, I believe it is a unitized unit. Any ideas would be greatly appreciated. Thanks, Rick


Last edited by 68BO7; Apr 17, 2020 at 04:36 AM. Reason: Spelling
Old Apr 15, 2020 | 07:26 AM
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Rick, I don't know the distributor #. The option was referred to as UHV Ultra High Voltage or CD Capacitive Discharge. It had a red coil, red dist cap, no points and a finned box on the forward section of the RF fender well. I'm not sure that it was standard on B07 package or an option.
Old Apr 15, 2020 | 07:30 AM
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Originally Posted by 68BO7
Hello, new to the forum. Great site! I am having difficulty finding info on the correct numbers Q-jet for a 68 BO7 455 390hp. I see the 7028251 RJ listed for all 455 and 390hp H/O for 68 but nothing that specific, perhaps that is correct for my application or is it going to be such an oddball it would be difficult to find? Anyone seen an original as installed from the factory? Also looking for info on the correct numbers distributor, I believe it is a unitized unit. Any ideas would be greatly appreciated. Thanks, Rick
Welcome. '8251 is the correct carb. The main difference in the W33 motor was the use of the 285/287 deg cam.
Old Apr 15, 2020 | 07:57 AM
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Thank you for the response. I am also uncertain if the UHV was standard or an option on the BO7 package but the few 68-69 cars I have seen have had it. If the 8251 carb is correct that shouldn't be too difficult 😎 👍

Last edited by 68BO7; Apr 15, 2020 at 07:59 AM.
Old Apr 15, 2020 | 08:18 AM
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About carbs in general. Does a carb # indicate exactly how that carb was always jetted/calibrated or were #'s used on a few different applications and jetted according to the specifics of the application?

E.g., 7028251 used on a 455/365hp and a 455/390hp but jetted differently for each HP?

I think JoeP has the book on this that requires a team lift to put it on a table.
Old Apr 15, 2020 | 08:42 AM
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Precisely, the 7028251 was also used on the std 442 400 hence my questioning on that carb as being correct. The engineers must have used a 'paper dyno' to figure out which carbs would potentially work best for each given application. That would be a lot of real dyno time.
Old Apr 15, 2020 | 08:58 AM
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All 8251's would be calibrated the same, there was a standard Rochester spec sheet for them (I don't have it, I've seen it for the 8255). The 8250 was the 350 carb - shared most of the same parts as the 8251 but had different calibration.
Old Apr 15, 2020 | 09:07 AM
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The only differences between '8250 and '8251 were the secondary metering rods and the power piston spring.





UHV was a $100.05 option on any Olds V8 in 1968 under RPO K66. It was not standard equipment on any model.




Old Apr 15, 2020 | 04:27 PM
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Is your B07 in the original car? Is your 8251 date coded to the car/power plant?
We need pix of said B07!
Old Apr 15, 2020 | 11:32 PM
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Great carb info! Unfortunately, the original carb, UHV distributor and air cleaner were stolen off the
original BO7 car. I am going to look at the car again and confirm original drivetrain sure looks to be, it is all there. Certified 120 speedo, rear sway bar, dual resonators out back, holes where dual spots used to sit on the pillars.

​​​​​​
Old Apr 16, 2020 | 04:42 AM
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Welcome to the site, would love to see your apprehender!
Old Apr 17, 2020 | 04:10 AM
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A decade or two ago, the motor was complete.

Old Apr 17, 2020 | 04:54 AM
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Love those push bars!
Old Apr 17, 2020 | 05:12 AM
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She's a diamond in the rough. I believe it was an EVOC training car.


Old Apr 17, 2020 | 05:15 AM
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Old Apr 17, 2020 | 06:31 AM
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Regarding the "Certified Police Speedometer" in the dash pic. Anybody know why one of these would be installed in a 66 Vista Cruiser? I was in a wrecking yard years ago and one of these was in a 66 Vista. Kicking myself everyday for not pulling it.
Old Apr 17, 2020 | 06:37 AM
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Originally Posted by edzolz
Regarding the "Certified Police Speedometer" in the dash pic. Anybody know why one of these would be installed in a 66 Vista Cruiser? I was in a wrecking yard years ago and one of these was in a 66 Vista. Kicking myself everyday for not pulling it.
In the 1966 model year, the Vista was available with the Police Apprehender packages.

From the 1966 SPECS booklet:



Old Apr 17, 2020 | 06:39 AM
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I saw an NOS unit come up on eBay a few years ago and it was reasonably priced. So they are out there.
Old Apr 17, 2020 | 06:45 AM
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1968 BO1 and BO7 options
Old Apr 17, 2020 | 11:34 AM
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WOW, even came with a couple of sets of old light bars / siren horn set up! Looking forward to following your efforts to get this one back on the road.
Old Apr 17, 2020 | 11:37 AM
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Actually, this is the money shot. The uber-rare rear sway bar and factory dual exhaust. Nice!


Old Apr 17, 2020 | 07:21 PM
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Is that a roll cage? The picture of the dash looks like it has a pipe next to it.
Old Apr 17, 2020 | 07:40 PM
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Good eye! Yes, I believe it was a training car(EVOC )in that case would make it an extremely 'rare' 68 BO7. At least the only one left.
Old Apr 18, 2020 | 03:41 AM
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What is a EVOC? I will be following your progress- this is so cool!!!
Old Apr 18, 2020 | 05:16 AM
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Nice... They are still out there......
Old Apr 18, 2020 | 07:18 AM
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What department used it?
Old Apr 18, 2020 | 08:37 AM
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Emergency Vehicle Operator Course is where one would learn driving skills on a course under pursuit conditions. The car has hood pins as well.. perhaps added later not sure. I need to research what looks like a 68-69 CA plate still on the car to see which department. The distributor IS still in the car by the way and the motor has C heads so it's a good start. I haven't picked it up yet going back this week.
Old Apr 26, 2020 | 09:47 PM
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Looking for a 68 Delmont/Delta/98 455 4 barrel air cleaner

I don't believe the 68 BO7 had anything different regarding the air cleaner, so any for that year should work ? The snorkel on a 69 looks slightly different. Anyone ?
Old Apr 26, 2020 | 10:04 PM
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I think the air cleaners were the same; however, I've not seen a correct reproduction decal. The 68 decal said Highway Patrol and in small print also said premium fuel only as did the gas tank cap.
Old Apr 26, 2020 | 10:32 PM
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Thanks for the info. I was wondering about sticker as well. The 69 sticker then appears to be reproduced. The Thermo pod on the 68 snorkel is placed closer to the air cleaner where the 69 is closer to the end of the snorkel.. from pics that I have seen.
Old Apr 27, 2020 | 05:30 AM
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The 1968 and 69 air cleaners are different due to the vent tube to the valve cover being on opposite sides. The 68 cars didn't use a sticker, they used a metal pie tin on the air cleaner.
Old Apr 27, 2020 | 06:50 AM
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This may be the 68 350/400 BO7 sticker sugar bear is referring to. So the 68 455 B07 used the standard Rocket 455 pie tin or did it use this sticker as well? I can't find an original engine pic of a 68 455 BO7.

Old Apr 27, 2020 | 08:08 AM
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Couldn't help thinking of Jake & Elwood

Elwood: It's got a cop motor, a 440-cubic-inch plant. It's got cop tires, cop suspension, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas. So what do you say, is it the new Bluesmobile or what?
Old Apr 27, 2020 | 10:49 AM
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Great movie 😁
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