Re: RB-B Blocks??

[Bill Watson <wwatson5@xxxxxxxxx>]

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For bore and stroke figures :

LA block :
273 : 3.63"x3.31"
318 : 3.91"x3.31"
360 : 4.00"x3.58"

B block :
350 : 4.06"x3.38"
361 : 4.12"x3.38"
383 : 4.25"x3.38"
400 : 4.34"x3.38"

RB block :
383 : 4.03"x3.75"
413 : 4.19"x3.75"
426 : 4.25"x3.75"
440 : 4.32"x3.75"

For 1959, the Chrysler RB 383, 10.1:1 compression ratio :
2-bbl carb : 305 bhp @4600 rpm and 410 @ 2400 for torque
4-bbl carb : 325 bhp @4600 rpm and 425 @ 2800 for torque

The Dodge/DeSoto B 383, 10.1:1 compression ratio  :
2-bbl carb : 305 bhp @4600 rpm and 410 @ 2400 for torque
4-bbl carb : 325 bhp @4600 rpm and 425 @ 2800 for torque

Dodge and DeSoto both offered higher powered versions.

Also, confusion in recognizing the B and RB 383 engines comes from
identifying the heads.   Due to the small bore of the RB 383, it used the
same heads as the B block 361 while the B block 383 used the same heads as
the RB 413.  So if you see RB 413 heads on a 383, it is not a Chrysler RB
383 but a Dodge/DeSoto B block 383.   Which is why there are a few writers
out there who claim the 1959-60 DeSoto, for example, used the RB 383.  And
it did not.

Bill
Vancouver, BC



----- Original Message ----- 
From: "don larson" <realdeal69dude2003@xxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Thursday, June 17, 2004 1:29 PM
Subject: Re: RB-B Blocks??



  Ahhhh, so the 383 is the only motor with both depending on what year it
was made? I guess the "B" 383 would be quicker, and the "RB" 383 would have
more torque?

 Don


Bill Watson <wwatson5@xxxxxxxxx> wrote:

Those are the letter codes Mopar assigned to their corporate engines, just
as they did with the car bodies. The "R" stands for "Raised", meaning the
deck height was increased to permit a longer bore. The most common engine
codes are :

G - 170-cid slant six
RG - 198 & 225-cid slant six

A - poly - distributor at rear (277, 301, 303, 313, 318, 326)

LA - wedge - distributor at rear (273, 318, 340, 360)

B - wedge - distributor at [front] (350, 361, 383, 400)
RB - wedge - distributor at [front] (383*, 413, 426, 440)

The 426-hemi block was derived from the RB.
The A block engines share nothing with the Dodge hemi engines that preceded
them or the Dodge/Plymouth poly versions.

* - RB 383 used only in 1959-60 American-built Chrysler Windsors and
Saratogas.

Bill
Vancouver, BC



----- Original Message ----- 
From: "don larson"
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Thursday, June 17, 2004 9:05 AM
Subject: Re: RB-B Blocks??



I hate to ask a stupid question, but I have been watching you guys talk
about RB, and B Blocks, what the heck does that stand for?? What should I
know about the Blocks other than the year they were made, small or long
block? Am I really that stupid??

Don


Bill Watson wrote:


American-built 1959 and 1960 Chrysler Windsors and Saratogas used an RB
block 383. All other 383 V8s were B block.

An intake manifold for a B block will not fit an RB block as the V is wider
at the top on the RB than on the B due to the longer stroke. And, of
course, the intake of an RB will not fit a B, the RB intake manifold being
too wide.

Bill
Vancouver, BC.



----- Original Message ----- 
From: "Thomas Thrue"
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Tuesday, June 15, 2004 10:51 AM



Hi

Now to a question that hopefully some of you can answer. Sorry but it´s
about 1959-1961 mopars.
Is the intake manifolds the same on a 361 and a 383 with cross ram compared
to a a 413 with the cross ram ? The 383 with cross ram, could it be a B
engine block and also a RB engine block ?

Thanks,
Thomas
1961 Fury
1963 Fury

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