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SOLD Parts The parts in here have already been sold. The topics will be kept for a few months for reference. |
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#1
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1971 HO 455 4 bolt block std bore
Early 71 Pontiac 455 HO block standard bore for sale. The casting number is 483677 and is a 4 bolt main with caps. Same motor used in the 455 HO GTO Judge. This motor has very light surface rust and easily clean up with 20 to 30 thousandths bore. $2,500
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#2
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Does it have a GTO or a Firebird VIN on it?
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#3
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So folks, I know its Christmas but I am bored and decided to list all the sites that document my 455 block casting number 483677 as an HO block. For all of you folks saying this is a non- HO block please send an email to the sites listed below.
Wallace racing list the 1971 casting 483677 as an HO motor Wowmusclecars.com list the 1970 YC motor as a GTO HO motor. Transamflorida.com or trans am specialties list the 1970 455YC motor as an automatic HO motor Butler performance specifically calls out a 1971 455 with a casting number of 483677 as an HO pattersoncoachworks just says the 1970 YC motor is a GT0 motor wildaboutcarsonline says the 1971 casting 483677 is an HO motor pontiaction.com state casting number 483677 is an HO block |
The Following User Says Thank You to caddor38 For This Useful Post: | ||
#4
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Quote:
You seem to focus on 483677 as an HO when convenient and YC as HO with other sites. You have to use the two numbers together to identify what you have. The Wallace racing site clearly shows that a YC coded engine with a 483677 block code is not an HO block. Between these forums and the Wallace Racing site, you can get as close to a definitive 99.9% answer as is possible. I wouldn't rely on any of those other sites for Pontiac code information. In fact, I've never heard of most of them. I have bought lots of parts from the Butler's and will continue to do so, but their parts code info is incomplete to incorrect.
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1971 Pontiac Trans Am Cameo White 1968 Firebird 400 coupe, Verdoro Green w/black vinyl top 1968 Firebird 400 convertible, Verdoro Green w/black top 1970 Buick Skylark Custom convertible(driver) Fire Red 1972 Buick GS 455 Stage 1 Royal Blue |
The Following User Says Thank You to wovenweb For This Useful Post: | ||
#5
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Quote:
I actually found another page on Wallace racing showings its an HO, give me time and i will find it. Last edited by caddor38; 12-25-2021 at 09:18 PM. Reason: found error |
#6
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Quote:
http://www.wallaceracing.com/blockcastnum.htm |
#7
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The motor is has YC identification which makes it a GTO according to my research. The motor was assembled in September of 1970.
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#8
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YC is a standard 455, not a HO. Is there a VIN stamped by the balancer?
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#9
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The 1970 455’s with the YC designation were placed in GTO’s and some grand prix’s. If you would take the time to review documentation on these “rare” motors I would appreciate that. Here is a link verifying its an HO motor.
http://home.grandecom.net/~desert_bu...tiacblocks.htm |
#10
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Urghh, yes this is discouraging. I suppose the question would be can you replace a failed original numbers matching “HO” designated block with this block and be considered a correct year matching block instead of number matching.
I suppose all of this info make me poop out of luck selling this motor. Urgghh, well lets see what other avenue i have is. |
#11
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Here is another link verifying this is a GTO motor HO 455
https://wowmusclecars.com/pontiac-en...des-specs/amp/ |
#12
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Vin# 68941
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#13
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For 1971, the YC was not a HO engine.
Here is a chart for 1971: What a couple of the guys were asking is that there is a partial VIN on the block down low by timing cover area, passenger side. This would help determine what it came in. It would look something like 21R123456 with the last digits of the car VIN
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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! "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 |
#14
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I believe that is a EUN number by the code and not the vin?Tom
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#15
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Most common code '71 455 4bbl Dport engine block...
As original assembled engine: 2 bolt main caps, 66 casting press in stud heads, a "2072" single points distrib,, & a "1262" Qjet. Late in '71 model year, unitized distributor became optional distributor. While the '71 YC was ordered in a few '71 GTO's, A-bodys, & Formulas & model J GrandPrixs, the VAST majority of '71 usage YC coded engines came out of B series cars. '71 Grandvilles came standard with a YC coded 455. Majority of '71 Bonnevilles came with them as well (occasionally will come across a '71 Bonne with a 455 block code YG). When a '71 GP was ordered with the SJ option, the 455 YC engine was standard equipment.
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Buzzards gotta eat... same as worms. |
#16
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Out of curiosity, is there a way to tell if the block was actually a 4 bolt block from the factory? I know it is currently drilled for a 4 bolt and has the caps but is there a way to tell after the fact from style/markings of caps or the drilled 4 bolt holes?
It appears the motor may be considered an HO if it was originally a 4bolt main with caps built in 70. Who is to say this wasnt used in a 1970 vehicle? The Vin looks to be pretty high for an early 71 vehicle. and the vin has 7 digits for the number 21P304555. Would this mean it was 304,455th in 1971 car produce from a motor built in sept of 1970, I dont think so? The vin should be lower? |
#17
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Do you have a pic of the main caps?
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#18
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Guys I can not find a Vin just the numbers next to the YC code. I have reviewed multiple pontiac sites stating the 70/71 pontiac 455 YC code is indeed an HO motor and the motor has 4 bolt caps. attached is a piture of the main caps.
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#19
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This is from a message board:
1970 GTO 455/360HP HO engine, order code L-75- block code for the automatic is YC & YA. Manual trans was code WA. The YC code was found in only 1 book (which is basically a Pontiac "bible") that I have while the YC code is listed as a 1971 455 engine. The 455 is called an HO engine in the GTO where 71 and later had both a "standard" lower HP version or the higher HP "HO" engine with the aluminum intake. Heads are#64. Full casting number is 9799364. I have several references to the 455 "ram air", so it may have been a package option. 455 CI Q-jet # for manual trans is 7040267 -non ram air 7040279 -with ram air automatic trans is 7040268 -non ram air 7040278 -with ram air Number of GTO's equipped with the 455HO YA/YC engine is listed as 2227 (241 Convertibles). More investigation is definitely needed and I would get the PHS documents to verify the L-75 455CI option, along with the rest of the info for the car.:thumbsup: |
#20
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Ok, I found the Vin. This is getting very interesting.
21P304555. |
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