331-354 Hemi intermediate shaft for LA dist

Remember there are B and RB distributors.

 

Does anyone know if the b or rb mopar distriburor housing is the same lenght as the small block housing? For some reason i think the small block distributor is shorter.

 

FOR SURE B and RB are the same diameter. They both use the same bushing.

 

What TR is saying is the RB has/may have a longer shaft, because of the raised deck, than a B shaft. Another thing to measure!

 

Oh, I get you. Yes, it does. B, RB and LA are all different lengths, and I am 98% sure they are all the same diameter, so in theory, you should be able to mix and match. Just a guess, but I would think that if you stay within type, dual point to dual point, electronic to electronic, ect, the pins for the advance wieghts should all be in the same place too. I should go up to my dads and dig out my distributors and measure all this.

 

73RR,
You forgot to mention that you offer these shafts for sale.
http://www.qualityengineeredcomponents.com/?page_id=811
I hope you have one left or can make one for me!
Thanks!

 

Godspeed, I didn't 'forget', I just don't like to push product.
There are plenty hardened shafts and a box full of gears on the shelf.
Prices on the web page are current as of this writing.

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How much engagement should the distributor have into the intermediate shaft. Im running the LA dist. with the hot heads extended shaft. Im only getting about .100" engagement. They told me i wont have any more than about .125". Dont seem like enough to me. Can someone tell me what length the intermediate shaft is supposed to be.

 

What engine/parts are you dealing with?

IMHO, .100" is not enough. Granted, there isn't much of an torsional load on the shaft but there is an oscillation that occurs that will wreak havoc on such a light engagement.
I would not use less than ¼".

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I have 331 chrysler and using the hot heads intermediate shaft. I went back and took some good measurements and came up with about .140" engagement. Hot heads said this is acceptable. It dont seem like much to me but this is all i have to work with. I agree with having at least .250". They should have just made the shaft .100" longer if you ask me.

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You can improve the engagement by adding some weld material to the end of the shaft.
Additionally, I would pull the shaft, then also add some material to the thickness of the tang and try for a
reasonably close fit into the slot. In oem configuration there is a fair amount of slop that allows the shaft to oscillate in the slot. This causes wear and also produces spark scatter in some ignition systems.
You must add material to both sides in order to maintain the centerline. This is usually done with the aid of a milling machine.
One additional improvement that is used in high output assemblies is to install a collar on the dist shaft to prevent the intermediate gear from climbing. This is not needed in a typical street engine but is inexpensive.