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Another Prestolite Dual Point Distributor Rebuild Question

View attachment 770118 View attachment 770118 View attachment 770118 View attachment 770118 View attachment 770118
Dragon Slayer said:
I need the Imperial Distributor IBS # to look it up in the manual. BUT... the one LC with W Cam Stop I have came from a IBP single point distributor for a 413. That camstop will not work in your IBS hemi distributor as the cam lobe diameter is smaller for single point versus dual point. You can check between the two you have. It should be obvious once you look at the dimensions.

To be clear, your talking about the vacuum parts on the Hemi distributor correct? Did you remove vacuum fitting and measure spring length and the internal washer stack thickness? That would be helpful to me. The arm number is the max vacuum advance in distributor degrees.

Lastly, the service manuals for Mopar have the rebuilding specs for dual point distributors. You do not want a lot of lateral or axial play. The double stack thrust washer at the top is normal. Depending on how the collar was drilled, I have found one position may give different clearance then another, and you certainly have to have it on correctly. Later Chrysler types with plastic collar are notorious for this. So I am surprised you would have to press bearing down because too tight. Normally you would have wear and it would be looser.
Click to expand...
Have a question. In the picture I'm posting the cam stop on the right is a Hemi super stock cam stop I bought in 1971. The picture in the middle is of a cam stop from a single point marine dist and the cam is the same as the S/S cam. Clocking for rotor probably is different. Could AR67GTX use middle cam stop with the 4 sec flat mechanical cam limiter Kowal mention in post #14? MULTI PICTURES THEY DIDN'T SEEM TO LOAD I WAS BUTTON HAPPY.
 
Dragon Slayer said:
I need the Imperial Distributor IBS # to look it up in the manual. BUT... the one LC with W Cam Stop I have came from a IBP single point distributor for a 413. That camstop will not work in your IBS hemi distributor as the cam lobe diameter is smaller for single point versus dual point. You can check between the two you have. It should be obvious once you look at the dimensions.

To be clear, your talking about the vacuum parts on the Hemi distributor correct? Did you remove vacuum fitting and measure spring length and the internal washer stack thickness? That would be helpful to me. The arm number is the max vacuum advance in distributor degrees.

Lastly, the service manuals for Mopar have the rebuilding specs for dual point distributors. You do not want a lot of lateral or axial play. The double stack thrust washer at the top is normal. Depending on how the collar was drilled, I have found one position may give different clearance then another, and you certainly have to have it on correctly. Later Chrysler types with plastic collar are notorious for this. So I am surprised you would have to press bearing down because too tight. Normally you would have wear and it would be looser.
Click to expand...
Have a question. In the picture I'm posting the cam stop on the right is a Hemi super stock cam stop I bought in 1971. The picture in the middle is of a cam stop from a single point marine dist and the cam is the same as the S/S cam. Clocking for rotor probably is different. Could AR67GTX use middle cam stop with the 4 sec flat mechanical cam limiter Kowal mention in post #14?
dist11.jpg
 
Dragon Slayer said:
I need the Imperial Distributor IBS # to look it up in the manual. BUT... the one LC with W Cam Stop I have came from a IBP single point distributor for a 413. That camstop will not work in your IBS hemi distributor as the cam lobe diameter is smaller for single point versus dual point. You can check between the two you have. It should be obvious once you look at the dimensions.

To be clear, your talking about the vacuum parts on the Hemi distributor correct? Did you remove vacuum fitting and measure spring length and the internal washer stack thickness? That would be helpful to me. The arm number is the max vacuum advance in distributor degrees.

Lastly, the service manuals for Mopar have the rebuilding specs for dual point distributors. You do not want a lot of lateral or axial play. The double stack thrust washer at the top is normal. Depending on how the collar was drilled, I have found one position may give different clearance then another, and you certainly have to have it on correctly. Later Chrysler types with plastic collar are notorious for this. So I am surprised you would have to press bearing down because too tight. Normally you would have wear and it would be looser.
Click to expand...
Have a question. In the picture I'm posting the cam stop on the right is a Hemi super stock cam stop I bought in 1971. The picture in the middle is of a cam stop from a single point marine dist and the cam is the same as the S/S cam. Clocking for rotor probably is different. Could AR67GTX use middle cam stop with the 4 sec flat mechanical cam limiter Kowal mention in post #14? View attachment 770121
 
You need to measure diameter of Cam Flat to Flat and Pt to Pt. If same as DP it would work other than start point for #1 wire if clocking of rotor flat is different. I see from your note the marine distributor was an IBJ. I need to do some research. Mopar single point was IBP, and every IBP I have seen is smaller cam lobe than dual point.
 
It had a special extension because I think engine was reverse rotation. In the picture the piece on the jeft would hold oil pump drive gear in place. After you put that piece in then put in dist.Note dist on left has a longer shaft than RB dist on right.
md.jpg
 
Dragon Slayer said:
I need the Imperial Distributor IBS # to look it up in the manual. BUT... the one LC with W Cam Stop I have came from a IBP single point distributor for a 413. That camstop will not work in your IBS hemi distributor as the cam lobe diameter is smaller for single point versus dual point. You can check between the two you have. It should be obvious once you look at the dimensions.

To be clear, your talking about the vacuum parts on the Hemi distributor correct? Did you remove vacuum fitting and measure spring length and the internal washer stack thickness? That would be helpful to me. The arm number is the max vacuum advance in distributor degrees.

Lastly, the service manuals for Mopar have the rebuilding specs for dual point distributors. You do not want a lot of lateral or axial play. The double stack thrust washer at the top is normal. Depending on how the collar was drilled, I have found one position may give different clearance then another, and you certainly have to have it on correctly. Later Chrysler types with plastic collar are notorious for this. So I am surprised you would have to press bearing down because too tight. Normally you would have wear and it would be looser.
Click to expand...

OK - appreciate your catching the old Imperial cam stop is apparently single point. It does measure smaller .955 to .984 on the flats. Lining the two up side to side I can't really differentiate a difference in the lobe peak positions - but it may be really small and I'll take your word for it.

I think that leaves us back to the FBO advance limiter plate and his original cam stop - which looks pretty good. He already has the DP Pertronix unit or we could just use the Imperial LC cam stop and a single point Pertronix.

On the old Hemi vacuum advance, the spring measured 2.470" free length and it had a .032" shim on the end. Does that help?

Thanks for the education.
 
Thank you. I had limited info on IBJ, but there was one series that was CCW rotation. Most were CW and for 354 Hemi in the late 50s. But it did call out the same type cam stop as IBS distributors. A lot of the early cars had more reasonable mech adv since initial was between 10-12. It was later cars with CAP and then the rest when emission really drove the issue that timing went to around 0 +/- a few degrees that mech adv jump to the 15-17 degree at distributor.
 
Well dang - turned my Roadrunner friend on to FBO for an advance plate limiter for this 67 Hemi distributor and he calls him up and lets him talk him into building him a complete custom Mopar cast iron distributor tuned to his camshaft specs with electronic guts, custom curve, cap, rotor, hook up to his MSD box etc, etc. So spent the afternoon assembling his CAP 67 Hemi distributor back together so he can put it on Ebay. Has new bushings, vacuum can, cap, rotor, points, condenser, cap clamps, oil fill port, painted, has original tag, etc. He also has a Pertronix unit for it but I'm not sure if he is going to sell it or not. if anyone knows of anyone looking for a 67 CAP Hemi distributor let me know.
 
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