What does a letter "R" mean on a 1969 383 engine pad? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer What does a letter "R" mean on a 1969 383 engine pad?

Print Thread

What does a letter "R" mean on a 1969 383 engine pad? #1097969 10/20/11 01:45 AM 10/20/11 01:45 AM
Joined: May 2003 Posts: 2,483 Minneapolis, MN H hemi70se OP top fuel
hemi70se OP top fuel H Joined: May 2003 Posts: 2,483 Minneapolis, MN	I've got a 1969 383 engine from out of a 1/2 ton pickup. It was a 2BBL with a 3 speed manual behind it. The block pad by the alt. has a lone letter "R" on it. I was wondering what this means. Also I was tickled to find 906 heads on it!!!!!!! It also has a steel crank.... pretty sure it got that because it was a stick shift. Anybody?

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: hemi70se] #1097970 10/20/11 01:52 AM 10/20/11 01:52 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Could be "R" for regular fuel

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: ScottSmith_Harms] #1097971 10/20/11 01:54 AM 10/20/11 01:54 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	I just tried posting all the codes but it posted as a garbled mess so I deleted it.... R = Regular fuel "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: 1_WILD_RT] #1097972 10/20/11 02:04 AM 10/20/11 02:04 AM
Joined: Jan 2003 Posts: 29,651 Hamtramck, PA A Alaskan_TA Fluffy Balladeer
Alaskan_TA Fluffy Balladeer A Joined: Jan 2003 Posts: 29,651 Hamtramck, PA	See http://www.hamtramck-historical.com/images/TSBs/1969/D69-25-1%20page5.jpg

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: hemi70se] #1097973 10/20/11 02:08 AM 10/20/11 02:08 AM
Joined: Nov 2010 Posts: 53 Neenah,Wi R rod440 member
rod440 member R Joined: Nov 2010 Posts: 53 Neenah,Wi	I think all 383's had steel cranks,except the '71 2 BBL?

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: rod440] #1097974 10/20/11 02:16 AM 10/20/11 02:16 AM
Joined: Jan 2003 Posts: 17,516 Las Vegas, NV 6bblgt I Live Here
6bblgt I Live Here Joined: Jan 2003 Posts: 17,516 Las Vegas, NV	& all '69 big blocks used "906" heads (non-HEMI)

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: 6bblgt] #1097975 10/20/11 10:08 AM 10/20/11 10:08 AM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	All above are correct , forged crank except the 71 2 bbl , R is a rated 9.2 compression engine , actual is more like 8.2 - 8.5 , and they all had 906's .

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: JohnRR] #1097976 10/20/11 12:50 PM 10/20/11 12:50 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Except those that came with 250 heads, which are almost exactly like 906s. Or was that only on '68s? The deal was that Chrysler most likely didn't have the volume to support a low-perf AND a high-perf head like chevy did. That's one of the fun things about Mopars. Most any engine can be made to run strong without changing major components; blocks, heads, cranks and rods. Anyway the 906 head features prominently in MOPAR mythology, even though any B/RB head made from 1968 on has the same lousy combustion chamber and virtually the same flow characteristics. Check out the Tech Archives. R.

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: dogdays] #1097977 10/20/11 03:17 PM 10/20/11 03:17 PM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	I think the 250 was a 68 head , I guess if we want to dig up obscure head numbers we could throw the 902 in there though I have never actually seen one of them .

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: JohnRR] #1097978 10/20/11 04:29 PM 10/20/11 04:29 PM
Joined: Dec 2006 Posts: 3,533 Indiana F Fury Fan master
Fury Fan master F Joined: Dec 2006 Posts: 3,533 Indiana	-902 is '74, right? I have a set on a motorhome engine.

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: Fury Fan] #1097979 10/20/11 05:11 PM 10/20/11 05:11 PM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	Quote: -902 is '74, right? I have a set on a motorhome engine. No clue , figured I may as well throw them out there since the obscure 250's were brought up ...

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: JohnRR] #1097980 10/20/11 05:25 PM 10/20/11 05:25 PM
Joined: Jan 2003 Posts: 43,540 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,540 Round Lake Beach, Illinoisy	I have several sets of 902 heads, all that I could see that is different from 906 heads were smaller valves. The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: Rhinodart] #1097981 10/20/11 05:35 PM 10/20/11 05:35 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Different valve sizes? '68 to '79 they were all 2.08/1.74. Even my 213 motorhome heads had'em. R.

Re: What does a letter "R" mean on a 1969 383 engine pad? [Re: dogdays] #1097982 10/20/11 06:08 PM 10/20/11 06:08 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier I Live Here
DPelletier I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Quote: The deal was that Chrysler most likely didn't have the volume to support a low-perf AND a high-perf head like chevy did. That's one of the fun things about Mopars. Most any engine can be made to run strong without changing major components; blocks, heads, cranks and rods. Anyway the 906 head features prominently in MOPAR mythology, even though any B/RB head made from 1968 on has the same lousy combustion chamber and virtually the same flow characteristics. Check out the Tech Archives. R. Well said; biggest difference between Chevies and Mopars is any B or RB can be easily modified to produce as much power as any Magnum or HP motor.......with a Chevy a low perf BB had cast cranks, 2 bolt mains, lower compression pistons, lower flowing oval port heads, hydraulic cams, cast iron intakes and Q jets and shared very little in terms of actual parts with it's high performance siblings. Add 906 "Magnum" heads to the Mopar Mythbusters file! Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1