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  #81  
Old 12-27-2021, 02:10 PM
pontiacjeff pontiacjeff is offline
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I came here looking for something else and an hour later can't remember what I was looking for. ��

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  #82  
Old 12-27-2021, 02:14 PM
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mrennie mrennie is offline
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Quote:
Originally Posted by pggto View Post
I have a question? I read through this post rather quickly and maybe I missed it. But did these 4 bolt main caps originally even come with this block? I'm not talking about code identification, but did this block physically come with those caps, or did some one stick them on there when they sold the block years ago? I've purchase a few blocks over the years that had the wrong caps on them or none at all. Sometimes it's very visible if you look at the crank bore alignment.
....front main cap appears to have mismatched bolts...so good question.

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  #83  
Old 12-27-2021, 02:15 PM
caddor38 caddor38 is offline
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Quote:
Originally Posted by pggto View Post
I have a question? I read through this post rather quickly and maybe I missed it. But did these 4 bolt main caps originally even come with this block? I'm not talking about code identification, but did this block physically come with those caps, or did some one stick them on there when they sold the block years ago? I've purchase a few blocks over the years that had the wrong caps on them or none at all. Sometimes it's very visible if you look at the crank bore alignment.
I posted some picture of the caps and folks seem to think they are original. Im not sure how you tell.

  #84  
Old 12-27-2021, 02:18 PM
caddor38 caddor38 is offline
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Quote:
Originally Posted by mrennie View Post
....front main cap appears to have mismatched bolts...so good question.
3 of the bolts were replaced from another motor. I just finished having a motor built and the engine guy put studs it, so took the bolts from the missing 3 bolts from the other 4 bolt block and put them in this one

  #85  
Old 12-27-2021, 02:33 PM
caddor38 caddor38 is offline
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Okay Everyone!

Here is proof from General Motors Pontiac out of their 1971 Service Manual.

The 1971 Service manual as captured in the pictures shows the YC motor was an HO.
This is indisputable evidence from the manufacturer.

Page 6-6 YC motor is an HO
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  #86  
Old 12-27-2021, 02:36 PM
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John Milner John Milner is online now
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What you just posted clearly shows that your block was a 325 horse block. I’m tempted to order the PHS myself and post it up.

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  #87  
Old 12-27-2021, 02:44 PM
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You are mistaking a t for +.Still grasping for straws!Tom

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  #88  
Old 12-27-2021, 02:48 PM
Bermuda Blue Bermuda Blue is offline
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Quote:
Originally Posted by caddor38 View Post
Okay Everyone!

Here is proof from General Motors Pontiac out of their 1971 Service Manual.

The 1971 Service manual as captured in the pictures shows the YC motor was an HO.
This is indisputable evidence from the manufacturer.

Page 6-6 YC motor is an HO

I would consider buying the motor in question if it would put a stop to this insanity.

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  #89  
Old 12-27-2021, 02:48 PM
caddor38 caddor38 is offline
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Quote:
Originally Posted by John Milner View Post
What you just posted clearly shows that your block was a 325 horse block. I’m tempted to order the PHS myself and post it up.
So what it can be a 4cylinder with 75 HP as far as i care. As long as it says HO.

  #90  
Old 12-27-2021, 02:50 PM
grandam1979 grandam1979 is online now
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Quote:
Originally Posted by caddor38 View Post
What book is that?
1967-74 Chiltons repair manual I have been using it since 79. It has the B G body listings for the YC also.
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  #91  
Old 12-27-2021, 02:51 PM
caddor38 caddor38 is offline
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Quote:
Originally Posted by tom s View Post
You are mistaking a t for +.Still grasping for straws!Tom
I was waiting for that you win Tom!

At first I was so excited but if you look at the sign its indeed a plus not a cross. The plus sign just says The WJ engine code is is manual transmission.

I concede this is not an official HO motor per Pontiac

  #92  
Old 12-27-2021, 02:54 PM
caddor38 caddor38 is offline
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Quote:
Originally Posted by Bermuda Blue View Post
I would consider buying the motor in question if it would put a stop to this insanity.
funny, laughs. Good dialogue though. Almost worth the money for the motor just to here the history of these motors from guys who have been doing this for a while. Motor is still for sale at a discount now, laughs

  #93  
Old 12-27-2021, 03:04 PM
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The Service Manual shows a '+' next to the YC not a dagger.








Being an early engine/block, there may be more people interested in it.
Later blocks were plentiful.
And possibly the people may like the early block compared to the later ones.
But it is not a 455 HO engine. The Engine code (YC) determines what was put in/on the block.
But everything can interchange to make that block what you want.


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  #94  
Old 12-27-2021, 03:15 PM
caddor38 caddor38 is offline
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Quote:
Originally Posted by johnta1 View Post
The Service Manual shows a '+' next to the YC not a dagger.








Being an early engine/block, there may be more people interested in it.
Later blocks were plentiful.
And possibly the people may like the early block compared to the later ones.
But it is not a 455 HO engine. The Engine code (YC) determines what was put in/on the block.
But everything can interchange to make that block what you want.



Yeah I know i may have pissed some people off here but this is a topic i searched and searched and searched on before posting the motor for sale. Hopefully this thread can be linked and searched within google as this topic arrises again. People thought originally these motors didnt make it to A and F bodys and now we know yc motor were indeed installed in a and f bodies. Also it seems some were installed with HO components meaning higher compression pistons, heads etc.

However i clearly state this motor before the stamp and before the internals were put in was in fact the identical block as the HO as it was sitting there with 4 bolt caps and would make a nice replacement block for those gone extinct. Even this motor somehow getting a 4 boltmain and caps is a mystery and quite possibly the last 483677 motor built on Sept 10, 1970


Last edited by caddor38; 12-27-2021 at 03:22 PM.
  #95  
Old 12-27-2021, 03:25 PM
Bermuda Blue Bermuda Blue is offline
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Quote:
Originally Posted by caddor38 View Post
funny, laughs. Good dialogue though. Almost worth the money for the motor just to here the history of these motors from guys who have been doing this for a while. Motor is still for sale at a discount now, laughs
You are correct. I learned something from OPH's post and that wouldn't have happened without this thread.

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  #96  
Old 12-27-2021, 03:39 PM
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Originally Posted by caddor38 View Post
So what it can be a 4cylinder with 75 HP as far as i care. As long as it says HO.
That's the problem, it doesn't.

  #97  
Old 12-27-2021, 04:22 PM
grandam1979 grandam1979 is online now
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Quote:
Originally Posted by caddor38 View Post
Okay Everyone!

Here is proof from General Motors Pontiac out of their 1971 Service Manual.

The 1971 Service manual as captured in the pictures shows the YC motor was an HO.
This is indisputable evidence from the manufacturer.

Page 6-6 YC motor is an HO
Look at it closer that’s the same thing I posted that’s a + not a cross next to the YC

  #98  
Old 12-27-2021, 06:45 PM
caddor38 caddor38 is offline
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can anyone explain this car? Do you think Mecum got it wrong?

https://www.mecum.com/lots/CH1013-16...o-convertible/

  #99  
Old 12-27-2021, 07:06 PM
tom s tom s is offline
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I remember back in 2014 you were trying to make a 63 421SR block to be a 63SD block!I see a pattern here!Tom

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  #100  
Old 12-27-2021, 07:24 PM
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DavesGTO DavesGTO is offline
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I only post on here when I can help with a pic or know exactly what I am talking about is correct, so not very often. If OPH and these guys tell you something they are right and someone else is wrong, yes even Mecum!

I need help, I can’t look away from this thread!


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