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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> L72 exhaust manifolds
Post Info TOPIC: L72 exhaust manifolds
4SPEED427


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L72 exhaust manifolds
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My apologies to Kevin for totally derailing his disc brake thread and turning it into a discussion on big block exhaust manifolds. I'll move that part of the discussion in that thread to this thread.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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4SPEED427

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65 SD L79 wrote:
going with stock L78 manifolds

 The L78 manifold is the same as the 325 horse manifold unless I've missed something? confuse



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars

65 SD L79

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4SPEED427 wrote:
65 SD L79 wrote:
going with stock L78 manifolds

 The L78 manifold is the same as the 325 horse manifold unless I've missed something? confuse

 are they not the same as L72 ones like on the B body? I will have to get out the books



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4SPEED427

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No, the big block Chevelles didn't have a special manifold for the solid lifter big blocks, crazy as it seems. Only the B bodies used a special manifold for the solid lifters and on top of that, only on the 65 B body L78 and the 66 B body L72.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars

LT1Caddy

 

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65 SD L79 wrote:
4SPEED427 wrote:
65 SD L79 wrote:
going with stock L78 manifolds

 The L78 manifold is the same as the 325 horse manifold unless I've missed something? confuse

 are they not the same as L72 ones like on the B body? I will have to get out the books

 Kevin.. I may have a left side BB manifold for sale this winter. I think I'm going to install my headers



-- Edited by LT1Caddy on Wednesday 13th of December 2023 08:34:20 PM

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4SPEED427

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Bruce, you do know that B body and A body manifolds don't interchange?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars

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4SPEED427 wrote:

Bruce, you do know that B body and A body manifolds don't interchange?

 No, I didn't know that. But thinking of it, the one I'm thinking of selling I think is a Corvette casting #. It is straight at the bottom, the 66 425HP has a curve at the bottom (I have a set of the correct ex mans)  That makes sense them being different....

THX

 



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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4SPEED427


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Here is what the l72 66 Canadian Pontiac and any 66 Chevrolet L72 B body would have used.

t1.jpg



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
LT1Caddy


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Those are the hard to get exhaust manifolds, 827/828 without emissions holes. I have the same set" with" the holes. The one above on the right is for the drivers side, I have one but it goes straight at the bottom. I believe it was used on the Corvettes.

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4SPEED427


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The Corvette manifolds and the 66 B body L72 manifolds are identical.

Dorman reproduces these manifolds. They come with the holes for smog pumps so you have to plug them.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
65 SD L79


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I bought a set of the Dorman ones for my GP L72  clone car



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4SPEED427


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I had bought a set for my Strato Chief 427 conversion but then I found originals so the Dormans went back. But I had no complaints about the Dorman pieces, they looked great and it seems to me the price wasn't all that bad on them.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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65 SD L79


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All good except for smog holes . I will plug  them , grind heads flush and have them ceramic coated



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4SPEED427


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65 SD L79 wrote:

All good except for smog holes . I will plug  them , grind heads flush and have them ceramic coated

 Do they have a ceramic coat that looks like cast iron?



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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4SPEED427 wrote:

The Corvette manifolds and the 66 B body L72 manifolds are identical.

Dorman reproduces these manifolds. They come with the holes for smog pumps so you have to plug them.

 The left side is different for the Vette...3994045



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4SPEED427


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I'm not sure where you found that but 3994045 is not a Corvette manifold that I can find. All my books say the 66 L72 B body left manifold is the same as big block Corvettes.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
4SPEED427


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I show 3994045 as fitting Impala/Caprice and pickup trucks.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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65 SD L79


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4SPEED427 wrote:
65 SD L79 wrote:

All good except for smog holes . I will plug  them , grind heads flush and have them ceramic coated

 Do they have a ceramic coat that looks like cast iron?

 Yepper



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LT1Caddy


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4SPEED427 wrote:

I show 3994045 as fitting Impala/Caprice and pickup trucks.

 I bought them from a Corvette guy, so I jumped to that conclusion that he said they were off a 74-75. I never checked the # to GM parts, but it seems they will fit some Chevelles and for sure the B body 65-65 cars. There is no "turn down" on the bottom, makes it a little difficult to install the oil filter. 

If someone needs one or the pair, I have them.



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65 SD L79


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FF05E18D-2FAF-412F-AA05-E27B4A88BA0A.jpeg

65 SD L79 wrote:
4SPEED427 wrote:
65 SD L79 wrote:

All good except for smog holes . I will plug  them , grind heads flush and have them ceramic coated

 Do they have a ceramic coat that looks like cast iron?

 Yepper

 FF05E18D-2FAF-412F-AA05-E27B4A88BA0A.jpeg



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4SPEED427


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Oh, that's ceramic? Cool, that looks perfect!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
65 SD L79


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4SPEED427 wrote:

Oh, that's ceramic? Cool, that looks perfect!

 These are perfect. gorilla coatings in Barrie ON. His daughter lives a few miles from me so he picks up and delivers



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65 SD L79


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This is my NOS set of 827 828 manifolds

85B6B9C5-F94D-46FB-98F2-F6D419D4A518.jpeg



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LT1Caddy


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Kevin.... ease up on the polish....LOL   NICE   (on the shiny parts, not the NOS parts)



-- Edited by LT1Caddy on Thursday 14th of December 2023 07:52:19 PM

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65 SD L79


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LT1Caddy wrote:

Kevin.... ease up on the polish....LOL   NICE   (on the shiny parts, not the NOS parts)



-- Edited by LT1Caddy on Thursday 14th of December 2023 07:52:19 PM

 Ya those L79s have a lot of bling



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4SPEED427


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65 SD L79 wrote:

This is my NOS set of 827 828 manifolds

85B6B9C5-F94D-46FB-98F2-F6D419D4A518.jpeg

 Those are for the L72 Grande Parisienne?



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
65 SD L79


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I am going to use the Dormans on the Grande and the NOS on the Impala



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4SPEED427


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65 SD L79 wrote:

I am going to use the Dormans on the Grande and the NOS on the Impala

 I am itching so bad to see that L72 Grande Parisienne project. The only thing better would be to find one of the originals!



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
65 SD L79


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4SPEED427 wrote:
65 SD L79 wrote:

I am going to use the Dormans on the Grande and the NOS on the Impala

 I am itching so bad to see that L72 Grande Parisienne project. The only thing better would be to find one of the originals!

 Unfortunately like so many others here the body shop it is in has taken my money and not working on the carno



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