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383 Stroker Reliability #1738885 01/26/15 01:23 PM 01/26/15 01:23 PM
Joined: Sep 2013 Posts: 18 Washington, D.C 6 69SportSat OP member
69SportSat OP member 6 Joined: Sep 2013 Posts: 18 Washington, D.C	I'd like to know if anyone has experienced any reliability issues from a 438 or 496 stroker build on a 383? Considering building one for a non-track car. Thanks.

Re: 383 Stroker Reliability [Re: 69SportSat] #1738886 01/26/15 01:37 PM 01/26/15 01:37 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Considering that Pontiac, Oldsmobile and Cadillac had OEM engines with 4.21, 4.25 and 4.31"strokes, respectively, there is no reason why a 4.25" stroke in a B or RB block would be any different. Reliability depends on quality of parts, how it is assembled, and how it is used. R.

Re: 383 Stroker Reliability [Re: 69SportSat] #1738887 01/26/15 02:47 PM 01/26/15 02:47 PM
Joined: Aug 2003 Posts: 43,205 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,205 Bend,OR USA	Unless you have one of the really rare late 1971 blocks that where cast for the 400 motors you need to be very careful on tuning, no detonation Most of the 383 blocks had thin main webs like most RB blocks do If you have a forged steel BB crank I would have it offset ground down to BB Chevy rod journal size and the stroke to 3.91 or 3.90 stroke and have the mains and counterweights cutdown to use in your 383 block, those motors flat rock I've built a bunch of Mopar V8 of all sizes and types, the 3.91 stroke B and RB motors work really well on the street and strip Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 383 Stroker Reliability [Re: Cab_Burge] #1738888 01/26/15 03:45 PM 01/26/15 03:45 PM
Joined: Sep 2013 Posts: 18 Washington, D.C 6 69SportSat OP member
69SportSat OP member 6 Joined: Sep 2013 Posts: 18 Washington, D.C	I'm considering purchasing the kit from 440Source.

Re: 383 Stroker Reliability [Re: 69SportSat] #1738889 01/26/15 03:55 PM 01/26/15 03:55 PM
Joined: Oct 2014 Posts: 113 PA Sir Valiant member
Sir Valiant member Joined: Oct 2014 Posts: 113 PA	I did my 383/450 stroker with a muscle motors kit, dropped right in!

Re: 383 Stroker Reliability [Re: 69SportSat] #1738890 01/26/15 05:19 PM 01/26/15 05:19 PM
Joined: Jan 2003 Posts: 75,023 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,023 U.S.S.A.	If you have to go past .030 have the block sonic checked , one member did his in a .060 over block that wasn't checked and it cracked a cylinder. Core shift is more of a problem in the early blocks.

Re: 383 Stroker Reliability [Re: Sir Valiant] #1738891 01/26/15 07:16 PM 01/26/15 07:16 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: I did my 383/450 stroker with a muscle motors kit, dropped right in! For a street eng as long as you build it right you should not have any problems. I like to keep mine at no more then .030 over also and build good quench in it along with the right cam to be sure you dont get any spark knock/ping. Sir Valaint thats a good looking bigblock. I am using the same valve covers. Ron

Re: 383 Stroker Reliability [Re: Sir Valiant] #1738892 01/27/15 03:01 PM 01/27/15 03:01 PM
Joined: Dec 2011 Posts: 11 Detroit, Michigan N njk53 member
njk53 member N Joined: Dec 2011 Posts: 11 Detroit, Michigan	Quote: I did my 383/450 stroker with a muscle motors kit, dropped right in! Sir Valiant, Out of curiosity, how much $$$ did you get wrapped up in your engine build? A buddy of mine is also wanting to stroke a 383 and is getting numbers that are all over the place.

Re: 383 Stroker Reliability [Re: dogdays] #1738893 01/27/15 05:40 PM 01/27/15 05:40 PM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	Quote: Considering that Pontiac, Oldsmobile and Cadillac had OEM engines with 4.21, 4.25 and 4.31"strokes, respectively, there is no reason why a 4.25" stroke in a B or RB block would be any different. Reliability depends on quality of parts, how it is assembled, and how it is used. R. Hmmm. This gets complex. I have no idea what the deck height (from crank C/L to head gasket surface) is on the engines quoted, but the shorter the deck, and / or the longer the stroke, the shorter the piston needs to be to fit. Once the skirt gets very short, esp. with short rods, there's lots of side thrust / loading which is not conducive to longevity or durability. I think that, for many of us, the engineered-in robustness of Mopars is part of the attraction. Since B and RB engines have, generally, the same bottom end (of the block) patterns, I build lowbuck B strokers (RB crank) by boring the main saddles to RB size. This way the crank is OEM strength (as is the bottom end of the block). Of course, lots of different combos can be assembled, and most work quite well, but the original question was regarding reliability... Rick

Re: 383 Stroker Reliability [Re: Rick_Ehrenberg] #1738894 01/28/15 12:26 AM 01/28/15 12:26 AM
Joined: Sep 2013 Posts: 18 Washington, D.C 6 69SportSat OP member
69SportSat OP member 6 Joined: Sep 2013 Posts: 18 Washington, D.C	I appreciate everyone's feedback. Reliability was the original question. The motor is going to be professionally built and dyno'd before installation. Can anyone provide their opinion - Muscle Motors versus 440source 383 stroker kits (reliability or other comments)?

Re: 383 Stroker Reliability [Re: Cab_Burge] #1738895 01/28/15 07:32 AM 01/28/15 07:32 AM
Joined: Jan 2003 Posts: 8,940 Holly/MI D Dean_Kuzluzski master
Dean_Kuzluzski master D Joined: Jan 2003 Posts: 8,940 Holly/MI	In case you missed this......... Quote: Unless you have one of the really rare late 1971 blocks that where cast for the 400 motors you need to be very careful on tuning, no detonation Most of the 383 blocks had thin main webs like most RB blocks do Go to the 440Source website and look at the B/RB casting pic's, specifically the mainwebs. A 440Source kit still needs to be thoroughly inspected by your builder. MuscleMotors will do all of that for you. R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04

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