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Author Topic: Getting the RB 383 back  (Read 4137 times)

Rob Molloy

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Getting the RB 383 back
« on: March 23, 2010, 07:45:17 AM »

Ok, so I'm starting to get stuff back. The cylinders were tapered, so they have been bored 20 over. Now my question, I'm looking for new pistons. Does anybody have any suggestions as to which pistons I should get? The new bore is 4.050, and all I can find are Ford, but nothing close to the 3.75 stroke. HELP!!! LOL!
 
 

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Leaburn Patey

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Getting the RB 383 back
« Reply #1 on: March 23, 2010, 08:05:49 AM »

Not many companies out there that supplies 383 pistons.
Keith Black (owned by Silvolite) and Sealed Power/Speed Pro (owned by Federal Mogul)are the only two.
http://www.kb-silvolite.com/assets/automotive_catalog.pdf
 
http://www.federalmogul.com/en/AftermarketSolutions/EMEA/EngineSolutions/Products/Pistons/SealedPowerPistons/Powerforged/
 
 
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Getting the RB 383 back
« Reply #2 on: March 23, 2010, 09:37:23 AM »

And if they don't have anything, then Egge is pretty good at having things like this.
 
http://www.egge.com/contact.shtml
 
To figure out if you can get any other "off the shelf" piston from another engine, there are a couple items which need to be the same or measured, or a way to fix them. The bore size is of course important, but you also need the piston wristpin diameter, and the correct piston wristpin to deck height. The deck height should be 10.725, stroke of 3.75, and rod of 6.768. The piston to deck height is then the height of the block deck, minus half the stroke and length of the rod. The remaining distance is the piston to deck height of 2.082, a height of 2.06 would more than work, so you now need to find a piston with a deck height of 2.06-2.08, assuming the wrist pins are the same size as the Mopar rod. The good thing is, if the wrist pin is smaller, the rods can be bushed to fix this easy enough, but, if (a real rare possibility) the piston pin is larger than the Mopar rod, the piston end is beefy enough to be resized. Basically it isn't a major issue, and not that expensive either way.
 
Hope this helps 
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Snotty

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Getting the RB 383 back
« Reply #3 on: March 23, 2010, 11:28:37 AM »

I know Steve does not like them but Kanter has them as well.
 
http://www.kanter.com/
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Stan Paralikis

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Getting the RB 383 back
« Reply #4 on: March 23, 2010, 12:16:06 PM »

Are you messin with my head when you said  383 RB block?

Rob Molloy

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Getting the RB 383 back
« Reply #5 on: March 23, 2010, 01:12:32 PM »

Tis true, 383 RB engine
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firedome

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Getting the RB 383 back
« Reply #6 on: March 23, 2010, 01:20:04 PM »

RB 383 was one or 2 yr only IIRC

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Stan Paralikis

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Getting the RB 383 back
« Reply #7 on: March 23, 2010, 01:23:06 PM »

Just checkin...

Rob Molloy

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Getting the RB 383 back
« Reply #8 on: March 23, 2010, 02:03:51 PM »

I get the same reaction from the shops that I deal with.
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Stitcherbob

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Getting the RB 383 back
« Reply #9 on: March 23, 2010, 03:20:20 PM »


Quote from: Snotty
I know Steve does not like them but Kanter has them as well.
 


I can gare-un-tee you that Fred buys them from Egge......we've had issues with Egge pistons in the past. Try Jahns for the weird sizes....our Egge ones grew .010" when hot and hit the head on a Pierce Arrow we did years ago....Jahns fixed that problem

I use Speed Pro Forged but not sure if they have RB 383's.......are the dimensions (bore size and wrist pin height the same for 361 maybe?

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Snotty

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Getting the RB 383 back
« Reply #10 on: March 24, 2010, 12:29:33 PM »

I did not notice the RB.  If I were home I could tell you the diameter of the 383 RB.
 
Yes, Stan, the first 2 years of the 383 it was an RB.  In '61 it was detroked to a B, but was given larger pistins.
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Stan Paralikis

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Getting the RB 383 back
« Reply #11 on: March 24, 2010, 01:14:47 PM »

Quote from: Snotty
I did not notice the RB.  If I were home I could tell you the diameter of the 383 RB.
 
Oh. I KNEW there was  a 383 RB.  Just never heard of anyone actually having one, let alone rebuild one. 

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Getting the RB 383 back
« Reply #12 on: March 24, 2010, 04:01:43 PM »

The RB 383 has nothing to do with the B block engines, it was the forerunner to the 440, using the 3.75 stroke and 10.725 deck height, so no, 4.125 pistons out of the 361, which only has a deck height ot 9.98, and although some parts with some machining can swap the crank to the shorter deck, the 3.375 stroke (350/361/383/400 stroke)doesn't work well in the RB block.
 
I simply guessed correctly based on the 4.050 bore size, vice the 4.270 (we are talking .020 overbore here), of the two 383 piston sizes. Any of the larger companies can make a custom piston for a price........
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firedome

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Getting the RB 383 back
« Reply #13 on: March 24, 2010, 04:32:40 PM »

Whadda ya mean it's nothing to do with B blocks, it's a B block wedge head engine, and was introduced in 1959 to increase torque
from the 350/361 of 1958. The block casting was raised, and it was only
available in Chrysler and DeSoto in 2 bbl form for '59 and '60. 
It had the 361 bore of 4.12, with the  3.75 stroke of the
413.  2 years only. See pages 50-51 of Don Taylors "Big Block Mopar Engines".


firedome2010-03-24 20:35:26
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Snotty

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Getting the RB 383 back
« Reply #14 on: March 24, 2010, 05:00:16 PM »

According to my '63 Chilton's book, the '59-'60 383 had a bore of 4 1/32 and a stroke of 3 3/4 (3.75 as Firedome said).  From what I cna see no other motor had that bore.
 
350: 4 1/16
361: 4 1/8
383 B: 4 1/4
413: 4 3/16
 
I know the 400, 426, and 440 had larger pistons - 400 being the largest of course!  So, given these measurements, you are going to need to get 383 RB specific pistons or bore the motor to take larger ones.
 
Sorry to be the bearer of bad news.
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