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Old 12-12-2020, 06:24 AM   #1
Biggles
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Default V8 Camshaft Bolt Pattern

Good morning Barners.
Where can I find a dimensioned drawing of the bolt pattern of V8 camshafts, with the one hole offset?
Any pointers gratefully received.



www.battenspecial.com

.

Last edited by Biggles; 12-15-2020 at 10:39 AM.
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Old 12-12-2020, 10:56 AM   #2
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Default Re: V8 Camshaft Bolt Pattern

Biggles, you can order a digital copy of the part drawing from the Benson Ford Research Center, $30/per drawing. I am trying it for the first time this week and they said I should get a digital copy of the drawing I requested shortly after the first of the year.
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Old 12-12-2020, 01:57 PM   #3
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Default Re: V8 Camshaft Bolt Pattern

I'll make you a drawing latter on today - will come from my 3D CAD model. What are you going to use it for?
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Old 12-12-2020, 03:21 PM   #4
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Default Re: V8 Camshaft Bolt Pattern

Thank you, that will be a great help.

I'm making a jig/tool to re-drill the camshaft mounting holes in the timing gear to enable the camshaft to be advanced or retarded anything up to five degrees.

Why? Because by degreeing various camshafts it has been discovered that some are as much as 3 degrees away from specification. For example:

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Old 12-12-2020, 03:37 PM   #5
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Default Re: V8 Camshaft Bolt Pattern

Quote:
Originally Posted by Biggles View Post
Thank you, that will be a great help.

I'm making a jig/tool to re-drill the camshaft mounting holes in the timing gear to enable the camshaft to be advanced or retarded anything up to five degrees.

Why? Because by degreeing various camshafts it has been discovered that some are as much as 3 degrees away from specification. For example:

There's an easy way, we use the SBC "pills" to adjust the timing!

I'll put some shots below!

Thanks, Gary in N.Y.

P.S. With our method you can get more than 5* if needed?
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Old 12-12-2020, 03:50 PM   #6
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Default Re: V8 Camshaft Bolt Pattern

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Yes, thanks Gary. I've used that method on a Cad 331.
I just like making things.
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Old 12-12-2020, 04:44 PM   #7
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Default Re: V8 Camshaft Bolt Pattern

I've filed the holes and used star washers if I thought changing the cam timing would help. However, for mosy applications, I don't think 2 or 3 degrees makes much difference.
Gramps
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Old 12-12-2020, 10:35 PM   #8
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Default Re: V8 Camshaft Bolt Pattern

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Originally Posted by Biggles View Post
Thank you, that will be a great help.

I'm making a jig/tool to re-drill the camshaft mounting holes in the timing gear to enable the camshaft to be advanced or retarded anything up to five degrees.

Why? Because by degreeing various camshafts it has been discovered that some are as much as 3 degrees away from specification. For example:

If you did a lot of them, you would find some are off more than 3 degrees.
From your profile I see you are qualified to figure out the math and I assume you have the shop equipment to do the work so why not just set the gear up on the turntable and drill it where you need it?
If you are careful you can drill 3 new offset set of holes.
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Old 12-13-2020, 10:13 AM   #9
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Default Re: V8 Camshaft Bolt Pattern

Here is what you need - I cut if from a PDF that came from a fellow flathead racer. When I checked my CAD model, I did not have the bolt pattern detailed as of yet and I don't have time to get to it - so a raster image will have to do.

This should give you everything you need (you may need to zoom in).

Flathead-21A-CAM-Front.jpg
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Old 12-13-2020, 11:54 AM   #10
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Default Re: V8 Camshaft Bolt Pattern

That cam end drawing looks very interesting. Lots of useful info there.

I can't speak of all the dimensions, I would like to believe they are ok, but the thread callout as 1/4-28 is an error It's 5/16-24.

Mart.
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Old 12-13-2020, 12:10 PM   #11
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Default Re: V8 Camshaft Bolt Pattern

That is why there is always a checker in Drafting.
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Old 12-13-2020, 03:06 PM   #12
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Default Re: V8 Camshaft Bolt Pattern

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That cam end drawing looks very interesting. Lots of useful info there.

I can't speak of all the dimensions, I would like to believe they are ok, but the thread callout as 1/4-28 is an error It's 5/16-24.

Mart.
Yep - I didn't catch that, but I have the correct threaded holes in my 3D CAD model - just didn't have time to do the 2D detail drawings and modify the snout for the earlier t-slot setup.
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Old 12-13-2020, 06:02 PM   #13
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Default Re: V8 Camshaft Bolt Pattern

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... why not just set the gear up on the turntable and drill it ...?
I could do (have done) that.
As I said, I just like designing and making things.
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Old 12-13-2020, 06:12 PM   #14
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Default Re: V8 Camshaft Bolt Pattern

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This should give you everything you need.
Yes, it does (apart from the bolts).
Many thanks.
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Old 12-13-2020, 06:27 PM   #15
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Default Re: V8 Camshaft Bolt Pattern

To me, it is an easy job with a rotary table and a 'pointer' to a cam tooth (marked as the install tooth). Once you setup on the stock locations and the pointer on the stock 'indexed tooth" - then determine where the first hole is, then you can select a "new tooth" to be the indexed tooth and use the degree markings to know where to drill each hole (advanced or retarded). Easy peasy! LOL

I'd probably make a quick aluminum "centering mandrel" - that fits in the hole on my rotary table and picks up the center hole on the cam gear (with a drilled/tapped hole in the center to hold down the cam gear) - making it very easy to pop one on the table and have things ready to rock.

Heck, since I'm going to be putting a 302 CI flathead together in January, might just have to set this up for shits and giggles - will post back to this thread.

Last edited by Bored&Stroked; 12-13-2020 at 06:33 PM.
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Old 12-13-2020, 06:54 PM   #16
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Default Re: V8 Camshaft Bolt Pattern

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Heck, since I'm going to be putting a 302 CI flathead together in January, might just have to set this up for shits and giggles - will post back to this thread.
Got all you said, B&S.

Heck, since I'm putting together a 286 CI 21-stud, there may be no time for messing with cam jigs, even for sh*ts and giggles.

Look forward to your post back - me too.
Thanks, all.
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Old 12-13-2020, 07:53 PM   #17
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Default Re: V8 Camshaft Bolt Pattern

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Got all you said, B&S.

Heck, since I'm putting together a 286 CI 21-stud, there may be no time for messing with cam jigs, even for sh*ts and giggles.

Look forward to your post back - me too.
Thanks, all.
How are you getting a big enough bore for 286 cubes?
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Old 12-13-2020, 08:05 PM   #18
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Default Re: V8 Camshaft Bolt Pattern

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How are you getting a big enough bore for 286 cubes?
Also, I am wondering what he is doing about moving the valves.
Anything is possible. Look what Ron Main did. As far as that goes, look what we do for 352 ci.
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Old 12-14-2020, 12:35 PM   #19
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Default Re: V8 Camshaft Bolt Pattern

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How are you getting a big enough bore for 286 cubes?
It's either a typo on the 21 or he's going to have to put a 4.5 stroke in it.
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Old 12-14-2020, 12:48 PM   #20
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Default Re: V8 Camshaft Bolt Pattern

One thought : He's in England so he's probably working with a Pilot engine. The only thing I really know about them is that they were also produced after the war. Do you suppose that could make any difference?

Last edited by tubman; 12-14-2020 at 12:55 PM.
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