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Old Hemi Parts
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Powerflite
Posted 2019-01-17 10:58 PM (#576965)
Subject: Old Hemi Parts



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I just got a great deal on this collection of new hemi parts. It includes a full set of brand new 331 10:1 compression pistons, a full set of brand new 392 hemi Mickey Thompson aluminum rods, and a brand new 392 hemi camshaft made to 300D specs.

The rods are about .015" short from standard 392 hemi length. They measure out at 6.942", whereas standard length is supposed to be 6.956". I assume that's to account for the extra thermal expansion of the aluminum vs. the iron. The difference in expansion between 7075 aluminum & cast iron is about 13.1 ppm/C, and assuming that the temperature goes from 20C to 260F or 126C, - a 106C range, that gives a length change of .14% or a final length of 6.952". It's still a little short, but close enough that it is plausibly correct.

The cam is brand new and just what I need to get one of my 392 motors running well. People say that rebuilding old hemi motors is expensive, but I would have to disagree. The reason is because of the wide availability of old speed parts like these that can be obtained very cheaply. I paid around 15% of what this stuff would have cost me if I were to purchase them new. You do have to know what you need, well in advance of when you need it though, because it takes time to find them.



(New Hemi Parts.jpg)



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Attachments New Hemi Parts.jpg (238KB - 21 downloads)
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Powerflite
Posted 2019-01-17 11:14 PM (#576966 - in reply to #576965)
Subject: RE: Old Hemi Parts



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The Jahns pistons are in a 3 7/8" size, according to the box, and 10:1 compression on a Chrysler. I measured the skirts on them to be 3.87" so the box label seems to be correct. But what is odd is that the box says they are STD. Usually that means standard size, but 3.875" bore isn't standard for any hemi motor. The 313 Canadian poly has a standard bore of 3.88, but these definitely have a hemi dome to them, so I seriously doubt they would work in a poly. If I ignore that STD label, these should work in a 60 mil overbore 331, and I am hoping that's what they were intended to be used in. I tried doing a search for the 8-942H TP part number, but came up empty.

The old paperwork on these parts is really neat. I will scan them and include them here for future reference.

Edited by Powerflite 2019-01-18 12:23 AM




(331 Hemi Jahns Pistons.jpg)



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Attachments 331 Hemi Jahns Pistons.jpg (157KB - 20 downloads)
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Powerflite
Posted 2019-01-18 12:05 AM (#576967 - in reply to #576965)
Subject: RE: Old Hemi Parts



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M/T Aluminum rods instruction sheet.



(MT Aluminum Rod Instructions.jpg)



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Attachments MT Aluminum Rod Instructions.jpg (246KB - 17 downloads)
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Powerflite
Posted 2019-01-18 12:07 AM (#576968 - in reply to #576965)
Subject: RE: Old Hemi Parts



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Jahns Pistons Instruction sheet (both sides).



(Jahns Pistons Sticker.jpg)



(Jahns Pistons Instructions pg1.jpg)



(Jahns Pistons Instructions pg2.jpg)



Attachments
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Attachments Jahns Pistons Sticker.jpg (88KB - 19 downloads)
Attachments Jahns Pistons Instructions pg1.jpg (244KB - 17 downloads)
Attachments Jahns Pistons Instructions pg2.jpg (246KB - 17 downloads)
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ToMopar
Posted 2019-01-18 2:35 AM (#576977 - in reply to #576965)
Subject: RE: Old Hemi Parts



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Powerflite - 2019-01-18 3:58 AM

......People say that rebuilding old hemi motors is expensive, but I would have to disagree.
......it takes time to find them.


Nathan, you're a lucky guy
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57burb
Posted 2019-01-18 5:39 PM (#577005 - in reply to #576977)
Subject: RE: Old Hemi Parts



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Lots of Hemi stuff out there, but the issue is getting someone to sell it. And of course, the price when you do. That's a good score!

I have an old nos Isky cam for a 392, and a set of Ansen main straps for one too. If I ever build a drag engine I'll put them in there. Good stuff!
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hemidenis
Posted 2019-01-18 7:21 PM (#577009 - in reply to #576965)
Subject: Re: Old Hemi Parts



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Yes, i'm the ones that assured that restoring a HEMI is very expensive. I did one and with many NOS parts, one of them was a complete NOS set of connecting rods that were listed in Gary Goers catalog for about 12 years and nobody care to purchase.

I faxed Gary and he said, "yes I have 16 of them NEW in the box" I purchased all of them, used 8 and sell the other 8 for a fortune on ebay with more than 26 bidders fighting for it. Also found a NOS engine damper, power steering, oil filler cap, crank pulley, bypass hose, oil sump, water pump impeller, main and rod bearings.

Yes parts are there, I'm just waiting to Gary to go back to business and wait if he print more NOS hemi parts on his catalog. Ha!










Edited by hemidenis 2019-01-18 10:57 PM
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wayfarer
Posted 2019-01-21 11:29 AM (#577168 - in reply to #576965)
Subject: Re: Old Hemi Parts



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Nice find!
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Mopar1
Posted 2019-01-23 10:55 AM (#577271 - in reply to #577168)
Subject: Re: Old Hemi Parts



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Some years ago there was a set of NOS Jahn's in the OEM box for a 331. Buyer didn't know what the C/R was, so I took a chance & won them. I found the C/R on the box. 13:1. Sold them to a vintage drag racer in Ca.
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Powerflite
Posted 2019-01-23 2:25 PM (#577277 - in reply to #576965)
Subject: RE: Old Hemi Parts



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Wow 13:1, that's in the Alcohol range. On these, I think I was just as pleased with the old instructions as I am with the parts. These 10:1 331 pistons are gonna be great in the '55 Imperial motor currently installed in my '56 Plymouth.
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ToMopar
Posted 2019-01-24 5:27 AM (#577320 - in reply to #577009)
Subject: Re: Old Hemi Parts



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hemidenis - 2019-01-19 12:21 AM
I'm just waiting to Gary to go back to business and wait if he print more NOS hemi parts on his catalog. Ha!


Denis, do you know if Gary sold that parts to Quirey? Or do he still have those kind of parts.
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Stroller
Posted 2019-01-26 10:30 AM (#577400 - in reply to #576965)
Subject: Re: Old Hemi Parts


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Hm. When I re did my 354 hemi it was not easy but I found Fel Pro Sealed Power jugs and nope were not cheap. Found a guy from the machine shop that new someone whose grand dad was into racing back in the 50-60's and was a mopar nut. Seems that with so many people starting to use the old hemi's there would be more parts re-pops. Folks are getting stuff somewhere.
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mikes2nd
Posted 2019-01-26 12:17 PM (#577409 - in reply to #576965)
Subject: Re: Old Hemi Parts


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i think Quirey bought everything.
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hemidenis
Posted 2019-01-26 9:23 PM (#577428 - in reply to #576965)
Subject: Re: Old Hemi Parts



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yes Tom Gary sold everything.
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