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#1
10-18-2025, 02:58 PM
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Tell me more about this 455 HO block I picked up
1972 485428 455 HO block, YB code, J041 date code. The block appears to have a relatively fresh .030" bore and 4 bolt main caps. How rare is this block and what is it worth?
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************************************* 1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude |
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#2
10-18-2025, 02:58 PM
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More pictures
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************************************* 1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude |
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#3
10-18-2025, 03:20 PM
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I would not take less than $1500 if it were mine. It all depends on how badly a person needs it. If you can find the car that matches the VIN #.......$2500 to $3500. Being for an auto trans cuts the value.
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#4
10-18-2025, 03:58 PM
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The block itself is not that rare.
I have had 3 of them and seen a total of like 8. With that year 455 block with that casting number they are all drilled and tapped for four bolt caps but only the 4 bbl motors got the 4 bolt caps.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#5
10-18-2025, 04:04 PM
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YB used a Unitized Distributor. This is for a Formula or TA.
428 TA's and 194 Formula had the automatic 455HO, don't know the breakdown for the YB/YE. 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#6
10-18-2025, 05:41 PM
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I paid $500 for the one I just built.FWIW,Tom
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#7
10-19-2025, 07:32 AM
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The main difference with any Pontiac engine with 4 bolt caps is the cap material itself.
As this chart shows on the right side all the caps used on block fitted with these main caps where of the better Nodular iron material, not the plain gray cast iron of the 2 bolt main caps.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
| The Following User Says Thank You to steve25 For This Useful Post: | ||
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#8
10-19-2025, 08:36 AM
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I sold one for $1500 10 years ago, but lowered the price to $900 when i noticed that a rod had hit the bottom of a cylinder and chipped it. Strike year at GM not many of those around anymore.
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#9
10-19-2025, 09:03 AM
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I have seen that same block with the 485 prefix used in some very late production 1971 motors .
So it was not just strictly used in 72 production.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#10
10-19-2025, 09:56 AM
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Interesting turn of events with this old block... So, the woman who sold me the block said it belonged to her late husband, and that they just sold their '72 Lucerne blue T/A on BAT. I found the situation interesting so I looked up the BAT sale.
After looking at the beautiful car, I noticed that the numbers on the block and the VIN on the auction car match. Is it safe to assume that I've found the actual car that this block belongs to? I have informed the seller and the guy who handled the BAT auction to see if they are willing to reach out to the new owner and give them my contact info... https://bringatrailer.com/listing/19...rd-trans-am-9/
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************************************* 1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude |
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#11
10-19-2025, 10:13 AM
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All I can say is WOW.
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So long, farewell. |
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#12
10-19-2025, 11:05 AM
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Very cool that you were able to likely find it's original home.
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-Jason 1969 Pontiac Firebird |
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#13
10-19-2025, 11:07 AM
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Unreal. I think the value of your block just went up. Lol
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72 Lemans sport 462 auto 75 Trans Am 4 speed 39k miles |
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#14
10-19-2025, 11:16 AM
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Quote:
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#15
10-19-2025, 11:25 AM
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https://bringatrailer.com/listing/19...rd-trans-am-9/
Scroll down in the question section to oct 8, Rocky Rotella mentions the previous owner and the original block
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 66 GTO, 495, M22, Strange S-60 w/4.10 Sold new at Royal Pontiac (Dealer# 07-679) 70 Formula 400/auto |
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#16
10-19-2025, 11:30 AM
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Quote:
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************************************* 1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude |
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#17
10-19-2025, 12:31 PM
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Nice!
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#18
10-19-2025, 02:38 PM
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Nice job! Some of you may recall that I reunited a 69 RAIV block, heads, and intake that I had with the original Warwick blue, 4.33 gear, auto trans 69 Judge, five states away.
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#19
10-19-2025, 02:52 PM
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Very cool!
please let us know if the new owner of that car buys the block!
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#20
10-19-2025, 04:20 PM
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I had guesstimated that the block in the car was about 15,000 units too low.
It is actually about 10,000 units too low. 151876 vs 161266 Some known examples : VIN – N514784 – EUN 0151345 – Body 11B VIN – N515007 – EUN 0151974 – Body 11B VIN – N520245 – EUN 0166926 – Body 12B This car would be: VIN - N521873 - EUN - 0161226 - Body 12B |
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