#21  
Old 03-26-2022, 09:48 PM
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Looks good,,,,following also.

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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
  #22  
Old 03-27-2022, 03:05 PM
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Originally Posted by SD455DJ View Post
Bruce, Nice work so far! I do like Palisade green, but I'm a bit biased. Following your progress.

Dennis
Looks good! If my car was a matching #,s car it would get the Palisade Green paint. I just love the Atoll Blue though. I found this pic of an Atoll Blue 70 on the internet.
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  #23  
Old 03-30-2022, 01:15 PM
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Does anyone know what this round gizmo is that is bolted to the passenger inner fender? It was mounted behind a vapor canister. It has what looks like a vacume port. Thanks
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  #24  
Old 03-30-2022, 09:37 PM
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It's a vacuum resevoir to keep the air conditioning controls and vents from changing under low vacuum conditions, should have a one way valve plumbed in the feed line from the engine.

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Old 03-31-2022, 10:42 AM
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It's a vacuum resevoir to keep the air conditioning controls and vents from changing under low vacuum conditions, should have a one way valve plumbed in the feed line from the engine.
Thanks for the info. 1970 must be the first year for that reservoir because I have done 2 different 69,s with air and they didn't have one.

  #26  
Old 03-31-2022, 07:48 PM
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It's a vacuum resevoir to keep the air conditioning controls and vents from changing under low vacuum conditions, should have a one way valve plumbed in the feed line from the engine.

What??? It's a carburetor choke vacuum source. Page 6-25 in the '70 GTO assembly manual.

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Old 03-31-2022, 08:36 PM
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Looks pretty close to early silver leaf green.Like it.Tom

  #28  
Old 04-01-2022, 04:33 PM
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What??? It's a carburetor choke vacuum source. Page 6-25 in the '70 GTO assembly manual.

Well it sure as hell is ��. Actually the carb has a nipple that is the source for the choke pulloff, and the pulloff has a second nipple that goes to that ball. It would seem all vacuum would be lost as soon as the engine is turned off. So, why is it used ??
I've seen that used as a ac syst vacuum resevoir my whole wrenching career. Why it is set up like that makes not a lick of sense to me.

I apologize for giving the incorrect info.

John


Last edited by BB70; 04-01-2022 at 04:38 PM.
  #29  
Old 04-07-2022, 02:11 PM
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The engine/trans ready to pull. It comes out tomorrow when I can get a buddy over to help. The engine is pretty dirty and looks like it was run for many miles. Im curious to see what the previous owner did to be able to run high compression 400 heads on a 455. That would be close to 12:1 compression. Im hoping the pistons were dished. Hopefully he didn't run the high compression by backing off the timing. Retarded timing is bad for the engine. On a good note I pulled the tranny pan and it was very clean inside. I should have the engine torn apart by Monday. I will post pics.
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Old 04-09-2022, 11:50 AM
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I got the engine partially torn down. The 13 heads look great. Thick valve margins. No signs of valve recession. Some of the nicest Pontiac heads Ive seen in a while. The block is standard bore 1973 455. I was wrong about it being a 71. I am shocked to see flat top factory cast pistons inside. With all that compression the previous owner must of ran leaded race gas. As you can see from the gunk in the valley area he wasn't too good on the oil change schedule. I will pull the crank out in the next day or two to see how that looks.
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  #31  
Old 04-10-2022, 12:45 AM
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I may have to bring my bumper down to you. That was a great job! I have new std pistons if it can be honed

  #32  
Old 04-10-2022, 10:33 AM
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I may have to bring my bumper down to you. That was a great job! I have new std pistons if it can be honed
Thanks. Im pretty sure the block will need to be bored .030. I happen to have a set of TRW forged .030 pistons from a previous build on hand to use. Im still debating whether to build a YS 400 with the 13 heads or stick with the 455 and run 6X heads that I have. Im leaning toward the 455 because I already have pistons for it and the price of new forged pistons for the 400 range from 600-700 bucks. Crazy!

  #33  
Old 04-10-2022, 01:20 PM
CatalinaMike CatalinaMike is offline
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Don't be afraid of the 400 either. I think i went on a Piston buying binge a couple years ago. Have 400 .030 pistons too. And 428 and 421 SD and...........

  #34  
Old 04-10-2022, 02:18 PM
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Don't be afraid of the 400 either. I think i went on a Piston buying binge a couple years ago. Have 400 .030 pistons too. And 428 and 421 SD and...........
Do you have any dished 400 pistons?

  #35  
Old 04-12-2022, 02:54 PM
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I think I found out why this car was parked years ago. Most of the lobes on the cam are wiped out. The metal from that got into the bearings and scored them up. They overheated too and lost their crush. The crank will have to be magged to see if its cracked before I can make a decision on what motor to go with.
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  #36  
Old 04-13-2022, 07:53 AM
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I think I found out why this car was parked years ago. Most of the lobes on the cam are wiped out. The metal from that got into the bearings and scored them up. They overheated too and lost their crush. The crank will have to be magged to see if its cracked before I can make a decision on what motor to go with.
Probably wiped cam result of lack of oil changes (evidenced by gunk in valley)

  #37  
Old 04-25-2022, 02:57 PM
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Got the crank back from machine shop. It magged good, It looks like I am going with the 455. More cubes is never a bad thing. Right? Ive been pulling the interior out. The part I hate the most. I would rather pull a motor any day over an interior. The interior was not that bad. Seats are actually useable. The fronts have a small tear here and there. They will get recovered anyway. The only thing that had me scratching my head was the amount of rust on the shifter. Everything else is clean and rust free. The previous owner must have spilled a bunch of sodas on the shifter.
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  #38  
Old 06-29-2022, 11:40 AM
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Its been a while since I posted progress. Ive been doing mostly boring stuff like disassembly. I am working on fenders and valences. I took them to a shop that does media blasting to make life a little easier. A lot of dings and dents were revealed. First pic is bare metal with skim coats of Bondo on the problem areas. Second pic is the same fender shot with self etching primer. Next is the fender shot with high build primer. I like this primer because it goes on somewhat glossy so you can see all the bad spots.
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  #39  
Old 07-15-2022, 05:20 PM
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Subscribing!

I wanted Atoll Blue too, but saw some in person, and wanted a little more depth and flake. I ended up with a 2015 Caddy color, Opulent Blue. I like it, was exactly what I was looking for. Think I listed the paint code on my build thread.

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  #40  
Old 07-24-2022, 02:36 PM
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Subscribing!

I wanted Atoll Blue too, but saw some in person, and wanted a little more depth and flake. I ended up with a 2015 Caddy color, Opulent Blue. I like it, was exactly what I was looking for. Think I listed the paint code on my build thread.

.
That Opulent Blue is a great color..... Now you have me thinking..

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