#41  
Old 10-12-2020, 09:30 PM
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I finally got the engine pulled, it is in fact original to this car, making it an original 455HO car, block and Vin match. Still stuck, im probably just going to pull it apart.
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  #42  
Old 10-13-2020, 06:08 AM
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Bill, do you know who the original dealer was?
(and address if so)



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  #43  
Old 10-13-2020, 09:25 AM
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That'll teach those know-it-alls on bookfaces who don't know about these cars ;-)

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Old 10-14-2020, 08:37 AM
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Sorry , I don't have any of that info.

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Originally Posted by johnta1 View Post
Bill, do you know who the original dealer was?
(and address if so)



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  #45  
Old 10-15-2020, 05:26 PM
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Yes lol. lots of people back peddeling on their comments , some got out of sorts and not happy to admit they were wrong .

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That'll teach those know-it-alls on bookfaces who don't know about these cars ;-)

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Old 10-15-2020, 09:12 PM
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That'll teach those know-it-alls on bookfaces who don't know about these cars ;-)
guess i missed it, what were the know it alls saying?

  #47  
Old 10-15-2020, 10:31 PM
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Originally Posted by muscle_collector View Post
guess i missed it, what were the know it alls saying?
"NO 455HO outside of A & F bodies. XF code is ONLY a base 455 from a Grand Prix, NOT a B-body!!! I'm right and you're wrong AND stupid to boot!!"

The know-it-alls were especially out in force on this one. It was sweet when the Protect-O-Plate and block and car all matched the VIN.

  #48  
Old 10-16-2020, 09:20 AM
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It was on Pontiac Midwest Connection page on fb, there a few posts I started there

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guess i missed it, what were the know it alls saying?

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  #49  
Old 10-16-2020, 11:15 AM
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The 455 nomenclature in 70 was confusing. None of the factory brochures refer to any of the 455's being an HO but some other factory literature did. There were two basically different engines:

The lower performance engine was only offered in the B bodies, rated 360 horse and like the 69 428-360 it was a 2 bolt main, small valve heads (basically the 400 2bbl high compression heads), 4 bbl, with a small single snorkel air cleaner with no chrome dress and the 066 cam.

Optional on A, B, G was a higher performance version with large valve heads (same 10 or 10.25 ratio compression, depending which factory spec you read), larger valves, 067 cam, dual exhaust and a dual snorkel air cleaner. On the B and G it was rated at 370 horse but on the GTO it was rated 360, apparently the GTO's chrome valve covers and air cleaner lid cost 10 horsepower!

What was missing on the B and G from previous years was the traditional HO big inch engine with the long branch manifolds and chrome dress. This is reflected in the option price of the 455's in 1970

The basic 455-360 in the B cars was standard in the Bonneville and was a $105.32 option on cars that had the 400-290 as standard equipment, this was the identical price for the 428-360 in 69 Catalina's. The 455-370 option on the B's cost $97.49 on a bonneville versus the 69 428 HO costing $149.55 on a bonneville.

Similarly on a GP the 455-370 (the only 455 offered on a GP) was $57.93, the exact same price as a 69 428-370. However the 69 428-390 was $176.94 extra.

I think the change in 70 to sort of split the features difference between the true 428 HO engines of previous years and the regular 428's was smart. By dropping the HO manifolds and special higher flow exhaust pipes of the 428-390 and the chrome dress up kit they were able to substantially lower the cost of that higher output engine.

If you think about it the cost of ordering the "good 455" on a Bonneville was really only about $65 if you were going to order duals anyhow on the base 455.

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  #50  
Old 10-16-2020, 01:31 PM
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This had dual exhaust also, but just log manifolds. Last plates on the car are dated 1977, so possibly all original. Not sure if all Bonnevilles had a dual exhaust crossmember as well.

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Old 10-16-2020, 04:11 PM
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I think all Pontiacs through 1974 had dual exhaust crossmembers. It wasn't until 1975 and the advent of Cat convertors that the crossmembers had only a single hump. Also, both 455 engines had the 067 cam shaft, as per the Service Manual, the AMA Specifications and my 70 Bonneville 455 360 that I have owned for 41 years.

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Old 10-16-2020, 04:56 PM
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Quote:
Originally Posted by David Brown View Post
I think all Pontiacs through 1974 had dual exhaust crossmembers. It wasn't until 1975 and the advent of Cat convertors that the crossmembers had only a single hump. Also, both 455 engines had the 067 cam shaft, as per the Service Manual, the AMA Specifications and my 70 Bonneville 455 360 that I have owned for 41 years.

Correct me if I'm wrong but, I believe the '70 455HO had the 068 cam(?).

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  #53  
Old 10-16-2020, 05:10 PM
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Quote:
Originally Posted by 70staged1 View Post
Correct me if I'm wrong but, I believe the '70 455HO had the 068 cam(?).
Manual transmission cars did. 067 for autos.

  #54  
Old 10-16-2020, 05:18 PM
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Quote:
Originally Posted by Ben M. View Post
Manual transmission cars did. 067 for autos.
Gotcha

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  #55  
Old 10-16-2020, 08:35 PM
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All the cross members on A,B,G cars up to 74 were made to receive duals regardless of if the car was so ordered.

The cams I referred to in my previous post are for automatic applications since 99% of these cars were. My reference for cam usage was factory power train specification charts. It’s possible changes were made during the model run or even between the chart release and the start of production.

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  #56  
Old 10-16-2020, 09:41 PM
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several years ago, i had a few of the 70 bonnevilles with the HO and got into several discussions with the "know it alls" telling me they didnt make them. i would just pull out the phs sheet that clearly shows it and shut them up.

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Old 10-16-2020, 09:59 PM
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Bill, I would have posted this on F-book, but Tiger would have probably called it Photoshop'd. Or, still argued they didn't make them.
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  #58  
Old 10-17-2020, 12:30 AM
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He laughed at me when I said they didn't make many, less than 2000 (right around 1890 or so I think).

  #59  
Old 10-19-2020, 10:14 PM
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Pretty clean on the inside of the engine, flipped it over to try soaking pistons from the bottom.
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Old 10-21-2020, 10:51 AM
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Interesting - it does not look like it has the "usual" long branch HO manifolds. Looks like a standard center dump manifold on the left side.

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