[C2] Pully Alignment
Thread Starter
Burning Brakes
Joined: Jun 2018
Posts: 954
Likes: 246
From: Hobe Sound, Florida
Pully Alignment
I have been having some issues with water pumps on my '66 327/300. Without going into the whole story, I found out that in '66 there were 2 different spacings on the water pumps--5/16" and 7/16".
The alignment discussion we are having has to do with the fact that my car is a C-60 car, which means that the center pulley arrangement is 2 pulleys sandwiched together (2+1) as most of you probably know.
Does anyone know off the top of their head if the C-60 cars used the 7/16" pump due to the extra pulley so it aligns correctly? It is only an 1/8" but that obviously makes a lot of difference in alignment. I only today found out from Ron Burke at Chevy Cool that there are, in fact, two different ones.
Thanks to anyone who might know this.
(Sorry for the typo in the heading; I can't figure out how to fix it.)
Cheers
The alignment discussion we are having has to do with the fact that my car is a C-60 car, which means that the center pulley arrangement is 2 pulleys sandwiched together (2+1) as most of you probably know.
Does anyone know off the top of their head if the C-60 cars used the 7/16" pump due to the extra pulley so it aligns correctly? It is only an 1/8" but that obviously makes a lot of difference in alignment. I only today found out from Ron Burke at Chevy Cool that there are, in fact, two different ones.
Thanks to anyone who might know this.
(Sorry for the typo in the heading; I can't figure out how to fix it.)
Cheers
Le Mans Master
Joined: Feb 2014
Posts: 8,991
Likes: 5,539
From: Richardson Texas
I have been having some issues with water pumps on my '66 327/300. Without going into the whole story, I found out that in '66 there were 2 different spacings on the water pumps--5/16" and 7/16".
The alignment discussion we are having has to do with the fact that my car is a C-60 car, which means that the center pulley arrangement is 2 pulleys sandwiched together (2+1) as most of you probably know.
Does anyone know off the top of their head if the C-60 cars used the 7/16" pump due to the extra pulley so it aligns correctly? It is only an 1/8" but that obviously makes a lot of difference in alignment. I only today found out from Ron Burke at Chevy Cool that there are, in fact, two different ones.
Thanks to anyone who might know this.
(Sorry for the typo in the heading; I can't figure out how to fix it.)
Cheers
The alignment discussion we are having has to do with the fact that my car is a C-60 car, which means that the center pulley arrangement is 2 pulleys sandwiched together (2+1) as most of you probably know.
Does anyone know off the top of their head if the C-60 cars used the 7/16" pump due to the extra pulley so it aligns correctly? It is only an 1/8" but that obviously makes a lot of difference in alignment. I only today found out from Ron Burke at Chevy Cool that there are, in fact, two different ones.
Thanks to anyone who might know this.
(Sorry for the typo in the heading; I can't figure out how to fix it.)
Cheers
You could contact AG Rebuilders (formerly Arthur Gould) in Massachusetts with any questions.
(508) 210-0891
Last edited by leif.anderson93; Mar 21, 2024 at 01:59 PM.
Drifting
Joined: Jul 2014
Posts: 1,556
Likes: 791
From: Massachusetts
I have been having some issues with water pumps on my '66 327/300. Without going into the whole story, I found out that in '66 there were 2 different spacings on the water pumps--5/16" and 7/16".
The alignment discussion we are having has to do with the fact that my car is a C-60 car, which means that the center pulley arrangement is 2 pulleys sandwiched together (2+1) as most of you probably know.
Does anyone know off the top of their head if the C-60 cars used the 7/16" pump due to the extra pulley so it aligns correctly? It is only an 1/8" but that obviously makes a lot of difference in alignment. I only today found out from Ron Burke at Chevy Cool that there are, in fact, two different ones.
Thanks to anyone who might know this.
(Sorry for the typo in the heading; I can't figure out how to fix it.)
Cheers
The alignment discussion we are having has to do with the fact that my car is a C-60 car, which means that the center pulley arrangement is 2 pulleys sandwiched together (2+1) as most of you probably know.
Does anyone know off the top of their head if the C-60 cars used the 7/16" pump due to the extra pulley so it aligns correctly? It is only an 1/8" but that obviously makes a lot of difference in alignment. I only today found out from Ron Burke at Chevy Cool that there are, in fact, two different ones.
Thanks to anyone who might know this.
(Sorry for the typo in the heading; I can't figure out how to fix it.)
Cheers
The 300 hp engine used the smaller spacing for all configurations.
The reason for the difference is that the 300 hp engine used standard-groove pulleys and the L79 engine used wider deep-groove pulleys (except when equipped with A/C and power steering). For your 300 hp engine, you need the lower spacing, which I think is 3-9/16". For the 300 hp engine, it does not matter whether you have A/C and/or power steering. The proper distance for the water pump flange is the lower value.
The flange on the water pump is a press fit that can be set to either value. Unfortunately, if you want to decrease the value, you need to remove the water pump, remove the rear cover, and support the impeller while pressing the flange inward.
If you still have questions, I have all the necessary info at home and can look it up for you on Sunday when I get home.
