MoparFins

Techical Discussions => Tech- - Engine => Topic started by: Stan Paralikis on September 26, 2008, 06:32:52 AM

Title: Visual differences
Post by: Stan Paralikis on September 26, 2008, 06:32:52 AM
If you're looking at pictures of a big block motor in a car, what clues do you you look for to determine if it's a B or RB block? Commando12008-09-26 11:34:16
Title: Visual differences
Post by: Stitcherbob on September 26, 2008, 07:52:21 AM
Distance from DS valvecover to brake booster or MC is one quick way.....

Title: Visual differences
Post by: Snotty on September 26, 2008, 10:50:36 AM
That's how I usually notice too.  Also, the water temp sending unit is sometimes in different places.  But, if looking in person, I look at the data block right away.
Title: Visual differences
Post by: Stan Paralikis on September 26, 2008, 12:10:58 PM
Quote from: stitcherbob
Distance from DS valvecover to brake booster or MC is one quick way.....
Man, you'd need one sharp eye for that.  There's only a 3/4" difference.
I need YOUR glasses.  (http://www.moparfins.com/forum/smileys/smiley17.gif)
Title: Visual differences
Post by: Leaburn Patey on September 26, 2008, 06:19:30 PM
RB has a flat pad between the ps pump and water pump housing.
Usually,there are numbers/letters stamped on it.
B does not have this feature.
Title: Visual differences
Post by: Snotty on September 28, 2008, 10:16:21 AM
Quote from: CBarge
RB has a flat pad between the ps pump and water pump housing.
Usually,there are numbers/letters stamped on it.
 
That's true of the early Bs, but not the later ones.  The 400 I have in my backyard has the ident pad.  It was that I was refering to in my previous post.
Title: Visual differences
Post by: Scott Preston on October 01, 2008, 05:42:19 PM
If you have this block,and can prove with the secondary codes that its a "B" motor with "RB" stamp pad,I would like to see it and see pictures of it too.In 35 years of building motor motors,I have never seen what you are stating.If you can,post the casting number,and all the secondary codes on the pad,so I can decode the motor.Mrmopartech from:MYMOPAR.com
Title: Visual differences
Post by: Snotty on October 02, 2008, 02:47:40 PM
Let's be sure we are talking about the same pad...
 
In the front of the motor before the intake manifold, just to the right of the thermostat housing - yes?  It's on the '75 400 I have, and I've also seen it on many 383s, including the one from a '65 Plymouth I took the AC bracket off of. 
 
I don't see the mystery.  But to satisfy your curiosty I'll take a picture of the motor.
Title: Visual differences
Post by: Stan Paralikis on October 02, 2008, 03:39:58 PM
(http://www.massmopar.com/yabb/Smilies/popcrn.gif)
Title: Visual differences
Post by: Steve on October 02, 2008, 05:00:34 PM
(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)
Title: Visual differences
Post by: Matt Aker on October 02, 2008, 05:06:28 PM
Me thinks that Snotty's "'75 400" is an idustrial 440 from an airport tug or an air-raid siren...
 
Alast, we wait...(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)(http://www.massmopar.com/yabb/Smilies/popcrn.gif)
Title: Visual differences
Post by: Scott Preston on October 02, 2008, 06:55:46 PM
Is it possible to have a special block from mother mopar,from a industrial,special applacation unit,sea going unit,truck,any thing is possible with these people and Could happen.I want to see it,decode it,and diesect it as much as possible to be sure,and rule out any human error,and note the block on out site as well.I would ask for the stroke of the crank for one,if the motor is apart,and take down the numbers on the crank.As this has got we going through every mopar race manual and all the thousands of books I have,mrmopartech
Title: Visual differences
Post by: Snotty on October 04, 2008, 09:58:00 AM
Ladies and Gentlemen, I am here to inform you that Altzeimer's has taken over the once fertle mind or the Rev. J. Scott Allred.   He will answer no more questions on this subject.
 
Dr. C. Moore Butz
Title: Visual differences
Post by: Snotty on October 04, 2008, 10:00:45 AM
That 400 motor has an ident pad on the left side of the distributor, behind the water pump housing.  How I knew that motor was a 383 is now a mystery.  I still have the AC bracket and it fits on the 400.
 
Pictures of my 400 would not have helped in the crank, etc, because it has the wrong crank in it, whcih is why it's sitting in my back yard.
 
Sorry boys.
Title: Visual differences
Post by: Stan Paralikis on October 04, 2008, 01:05:46 PM
I was waiting for everyone to finish their popcorn before I posted this...
 
(http://i34.tinypic.com/11tybo0.jpg)
(http://i34.tinypic.com/2w36v42.jpg)
Title: Visual differences
Post by: Steve on October 04, 2008, 02:51:34 PM
I knew the correct answers.  I was just keeping my trap shut and letting someone else have a chance. . . . 
 
OK  I guess I need to put this to rest
 
Snotty is correct.  Without looking at the carb or the pad, you can't tell physically if it's a 383 or a 400.  Neither are RB's  B's and RB's share allot of components
 
The 400 used a Holly or a TQ and the 383 was packahed with a carter 2 or 4 BBL.  A TQ was never used on a 383.  It wasn'r made yet.
 
Good info Stan
Title: Visual differences
Post by: Arlen Vander Hoff on October 06, 2008, 10:45:33 AM
The guy that I got my car from tells me at every freakin cruise-in and show I see him at that my engine (383) came out of a 68 Road Runner. Is there a way to tell if this is fact or crap??? I was told by others years ago that RR's had a "special" 383 different from everyday joe blow passenger cars. Is it true or what??? What is the difference if really any?
Title: Visual differences
Post by: Snotty on October 06, 2008, 12:32:44 PM
I thought your question was:
 
"Without crawling under a car to see the casting numbers, or without checking any sequence numbers etc, and just looking at a car with it's hood up, how do you know a B from an RB?"  
 
I have one:  How can you tell a A-833 from a BW T-10 by looking at the shifter? 
Title: Visual differences
Post by: Matt Aker on October 06, 2008, 12:46:11 PM
Quote from: Snotty
I have one:  How can you tell a A-833 from a BW T-10 by looking at the shifter? 
 
(http://www.moparfins.com/forum/attachments/61/Mobbypose.gif)
 
MoparMatt2008-10-06 17:46:45
Title: Visual differences
Post by: Stitcherbob on October 06, 2008, 08:26:54 PM
The only way to tell if your 383 is from a Roadrunner, Ardoggy, is if the VIN on the oil pan rail starts out RM 21; RM23....something like that. Otherwise all of those 383's look the same. The cam and intake, exhaust manifolds were different for RR's.

Title: Visual differences
Post by: Stan Paralikis on October 07, 2008, 01:21:40 AM
I agree with Bob.  Externally, the only difference was the use of the 440 exhaust manifolds on the 383 block.  But that is such a common sight today that I wouldn't use that as a basis for determining it.  I thing he's just jawboning to look smart.
Title: Visual differences
Post by: Steve on October 07, 2008, 05:00:07 AM
Quote from: Snotty
Ladies and Gentlemen, I am here to inform you that Altzeimer's has taken over the once fertle mind or the Rev. J. Scott Allred.   He will answer no more questions on this subject.
 
 
Yeah right.  Your're still young yet. . .  (http://www.cumminsforum.com/forum/images/smilies/rofl%5b1%5d.gif)