The Ford Barn

Dave1931Pickup · 05-23-2021, 08:26 PM

Is a B Distributor Cam the same as the A Distributor Cam?
Thanks, Dave

Bob C · 05-23-2021, 08:42 PM

No.

jb-ob · 05-23-2021, 08:59 PM

Nope, Improved profile to give longer dwell, better coil saturation = hotter spark at your plugs.

Enjoy the ride.

Patrick L. · 05-24-2021, 05:50 AM

I believe all that is available now they the vendors is the 'B' cam because of its different [ better dwell angle] profile.

katy · 05-24-2021, 10:07 AM

Quote:

Originally Posted by jb-ob

Nope, Improved profile to give longer dwell, better coil saturation = hotter spark at your plugs.

But they are interchangeable.

If you put in a new B cam, check the finish of the surface.
I put a new one in a few years ago, expecting it to be A OK and it wasn't. The surface was quite rough and wore down the rubbing block of the points in a very short time.
The manufacturers may have improved them by now, it would be wise to check a new one to be sure of it's finish.

One can see the rough finish in this photo:

Benson · 05-24-2021, 10:22 AM

Sponsored Links (Register now to hide all advertisements)

For those who do not know this:

I see from this photo that the points are REPRO.

Points made for the last several years are too long and do not lineup as seen in the photo.

Berts has two versions of the blocks for sale.

One original and the second one to fix this problem.

A-12160 is original point block for original point sets.
A-12160-B is version for long points.

click here to see both types:
https://modelastore.com/index.php?ro...&category_id=0

Read description for details.

Here is page for both point sets:

https://modelastore.com/index.php?ro...&category_id=0

NOTE The new block set will not work with upper plate in the photo because block is not removable in this case.

JayJay · 05-24-2021, 10:23 AM

Quote:

Originally Posted by katy

But they are interchangeable.

If you put in a new B cam, check the finish of the surface.
I put a new one in a few years ago, expecting it to be A OK and it wasn't. The surface was quite rough and wore down the rubbing block of the points in a very short time.
The manufacturers may have improved them by now, it would be wise to check a new one to be sure of it's finish.

One can see the rough finish in this photo:

I put in a new B dist cam a few weeks ago and found it to be sort of smooth, but not what I expected. Had to spend a few minutes with fine paper and emery to get it right.

JayJay

katy · 05-25-2021, 09:59 AM

Quote:

I see from this photo that the points are REPRO.

After that photo was taken I replaced the upper plate w/a new one w/the detachable mount for the stationary point. The points still didn't line up so I filed the holes where the mount attaches to the plate to allow adjustment of the mount. I also smoothed out the surface of the cam.
The original points were still good, other than the worn out rubbing block, so I replaced the rubbing block w/a homemade one.

The Master Cylinder · 05-25-2021, 10:20 AM

Bratton's has a very nice machined points block. https://www.brattons.com/machined-di...int-block.html

Greg Jones · 05-25-2021, 01:12 PM

Even with the modified point block, it still takes some fussin' to get it to fit half-way correctly and have the points close squarely. If these points are going to be made incorrectly forever, then perhaps the vendors might consider making a modified upper plate so that the point block fits correctly. Wallowing out the holes to make the point block fit is not a real good solution. My two cents.....

05-23-2021, 08:26 PM	#1
Dave1931Pickup Senior Member Join Date: Jun 2015 Posts: 167	B Distributor Cam Is a B Distributor Cam the same as the A Distributor Cam? Thanks, Dave

05-23-2021, 08:42 PM	#2
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,751	Re: B Distributor Cam No.

05-23-2021, 08:59 PM	#3
jb-ob Senior Member Join Date: Jun 2010 Posts: 640	Re: B Distributor Cam Nope, Improved profile to give longer dwell, better coil saturation = hotter spark at your plugs. Enjoy the ride.

05-24-2021, 05:50 AM	#4
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: B Distributor Cam I believe all that is available now they the vendors is the 'B' cam because of its different [ better dwell angle] profile.

05-24-2021, 10:22 AM	#6
Benson Senior Member Join Date: May 2010 Posts: 2,597	Re: B Distributor Cam Sponsored Links (Register now to hide all advertisements) For those who do not know this: I see from this photo that the points are REPRO. Points made for the last several years are too long and do not lineup as seen in the photo. Berts has two versions of the blocks for sale. One original and the second one to fix this problem. A-12160 is original point block for original point sets. A-12160-B is version for long points. click here to see both types: https://modelastore.com/index.php?ro...&category_id=0 Read description for details. Here is page for both point sets: https://modelastore.com/index.php?ro...&category_id=0 NOTE The new block set will not work with upper plate in the photo because block is not removable in this case. Last edited by Benson; 05-25-2021 at 01:14 PM.

05-25-2021, 10:20 AM	#9
The Master Cylinder Senior Member Join Date: Aug 2012 Posts: 880	Re: B Distributor Cam Bratton's has a very nice machined points block. https://www.brattons.com/machined-di...int-block.html __________________ The Master Cylinder Enjoying life at the beach in SoCal...

05-25-2021, 01:12 PM	#10
Greg Jones Senior Member Join Date: Jul 2010 Location: Aiken, South Carolina Posts: 695	Re: B Distributor Cam Even with the modified point block, it still takes some fussin' to get it to fit half-way correctly and have the points close squarely. If these points are going to be made incorrectly forever, then perhaps the vendors might consider making a modified upper plate so that the point block fits correctly. Wallowing out the holes to make the point block fit is not a real good solution. My two cents.....