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Rocky
Desoto Camshafts ?'s


Scored another Desoto Hemi and Parts last week. 1956 330 engine.
Reading and re-reading articles on interchangeable parts for Desotos.
A little confused and could use some help, please.

Forgot to order a Desoto Interchangeable parts book from Bob in my recent order.

1. The Desoto 276 is a long-nosed cam correct ?

2. If I want to use a Hot Heads Aluminum Cam Cover : I need to have the cam snout shortened and re-drilled. correct ?

3. Are ALL of the other Desoto Cams short-nosed ?
If not, which engine camshafts are short-snout & which are long-snout ?

4. I got a extra Desoto 330 cam in the engine purchase last week, plus other parts.
Can I swap out the extra 330 cam into the 276 Desoto and then the Hot Heads Timing Cover
will fit ?

Thanks,
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on: Sat 13 of Feb, 2016 [00:42 UTC] reads: 4146

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Webmaster
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Re: Desoto Camshafts ?'s
on: Thu 29 of Jun, 2017 [19:18 UTC] score: 0.00
> Scored another Desoto Hemi and Parts last week. 1956 330 engine.
> Reading and re-reading articles on interchangeable parts for Desotos.
> A little confused and could use some help, please.
>
> Forgot to order a Desoto Interchangeable parts book from Bob in my recent order.

Rocky:
Hot Heads used to do the cam snout mod. but our guy retired. It's involved. Not only do you shorten, drill and tap the snout, a very thin sleeve with the thrust washer made on to it for strength needs to be made. After the sleeve is pressed on to the shortened shout, the key way needs to be widened correctly to keep the can timing straight.
The only one I know who still does that mod is Racer Brown Cams. He also knows hemi cam grinds. He's in MD, 410 866-7660
I hope this helps, Bob

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George
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Re: Desoto Camshafts ?'s
on: Thu 29 of Jun, 2017 [01:01 UTC] score: 0.00
.
>
> 1. The Desoto 276 is a long-nosed cam correct ?
>
> 2. If I want to use a Hot Heads Aluminum Cam Cover : I need to have the cam snout shortened and re-drilled. correct ?
>
> 3. Are ALL of the other Desoto Cams short-nosed ?
> If not, which engine camshafts are short-snout & which are long-snout ?
>
Cams up through '55 are long snout, short snout '56 & up,

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billm
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Re: Desoto Camshafts ?'s
on: Tue 16 of Feb, 2016 [14:50 UTC] score: 0.00
George is correct about the long nose vs. short nose cam applications. Do not swap cams between low deck and tall deck Hemi engines! They will physically fit, but the valve timing will be way off. The lifter location (angle) in the block is different between low deck and tall deck engines. This was done to keep the pushrods aimed in the right direction when the block decks were raised. This isn't a problem with inline valve engines like the Ford 302 and 351 because raising or lowering the deck height of the block doesn't materially affect the pushrod angles. The pushrods in the Hemis are at compound angles, so any substantial change in deck height requires a change to the lifter angle to prevent the pushrods from binding in the head clearance holes.
The bottom line is that you must use a low deck cam in a low deck engine, and vice versa.

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George
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Re: Re: Desoto Camshafts ?'s
on: Tue 16 of Feb, 2016 [17:18 UTC] score: 0.00
> George is correct about the long nose vs. short nose cam applications. Do not swap cams between low deck and tall deck Hemi engines! They will physically fit, but the valve timing will be way off. The lifter location (angle) in the block is different between low deck and tall deck engines. This was done to keep the pushrods aimed in the right direction when the block decks were raised. This isn't a problem with inline valve engines like the Ford 302 and 351 because raising or lowering the deck height of the block doesn't materially affect the pushrod angles. The pushrods in the Hemis are at compound angles, so any substantial change in deck height requires a change to the lifter angle to prevent the pushrods from binding in the head clearance holes.
> The bottom line is that you must use a low deck cam in a low deck engine, and vice versa.

Sounds like a decent explanation

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George
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Re: Desoto Camshafts ?'s
on: Mon 15 of Feb, 2016 [21:15 UTC] score: 0.00
long nose cams are for the low deck Desoto (276/291) & short nose are for the tall deck (330,341,345). All the experts say you can't interchange due the different deck heights changing some angles. Seems odd where the Ford 302 & 351W cams interchange despite the 351 W block being a mid size block vs the small block 302W.

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gullwing
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Re: Re: Desoto Camshafts ?'s
on: Sat 24 of Jun, 2017 [00:39 UTC] score: 0.00
> long nose cams are for the low deck Desoto (276/291) & short nose are for the tall deck (330,341,345). All the experts say you can't interchange due the different deck heights changing some angles. Seems odd where the Ford 302 & 351W cams interchange despite the 351 W block being a mid size block vs the small block 302W.

To give you an explanation for the angle think of a triangle. The intake pivot is point A. The exhaust pivot is point B and the centerline of camshaft is point C. With the low deck and high deck hemis the distance AB is equal but the distance AC and BC gets further for the tall deck motors. So this means the angle ACB changes between the two motors and the camshaft lobes need to be moved to compensate. With a Ford 302 versus 351 there is no triangle the intakes and exhausts are next to each other so the camshaft lobes do not need to be moved between the low and high decked motors



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