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383 Guru's need help w/budget rebuild..
#304995
05/01/09 09:05 PM
05/01/09 09:05 PM
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Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
moparrulzzz
OP
top fuel
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OP
top fuel
Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
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I want to do a budget rebuild on my 383. I have a 440 tucked away for a future stroker. I don't have the coin for that right now, and I want to get my car on the road. Here is what I have freshened up .030 block, rods have been recon/new hardware.906 heads need looked over and gone thru.Crank has been magged polished and all the journals are standard. I am basing this rebuild on the Mopar Muscle article(resto to Rad) bolt on 117 HP on stock 383. I want to keep my 906's and put a set of KB400 pistons in. I need advice/help with decking the block. Do I need to?? I was told to use a .020 shim head gasket and that would put me at 9.5:1 on compression. Does this sound accurate/correct?? Was also told this set-up would help with quench. Next part or the puzzle the cam. The article says to use the Comp XE285HL-10( My car is a auto with 3.91's, '68 Coronet) w/the stock valve train and comp's PN 924 dual valve springs. Headers..Hooker 1 7/8 Carb..850 Demon Intake...Mopar perf. M-1 Should I have the rotating balanced?? Heads I need too know what size valves should I put in. I am sure I will need a valve job..any recomedations?? The article said this was a easy 450 HP. Anyone have any input or suggestions I would greatly appreciate it. This will be my 1st engine without my dad so I will have LOTS of questions. And please don't tell me to just get a 440. I have my sights set on my lowly 383 for now!! Thnx Chuck 
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Re: 383 Guru's need help w/budget rebuild..
[Re: moparrulzzz]
#304997
05/01/09 11:53 PM
05/01/09 11:53 PM
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Joined: Jan 2003
Posts: 75,082
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
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Quote:
I want to do a budget rebuild on my 383. I have a 440 tucked away for a future stroker. I don't have the coin for that right now, and I want to get my car on the road.
Here is what I have freshened up .030 block, rods have been recon/new hardware.906 heads need looked over and gone thru.Crank has been magged polished and all the journals are standard.
I am basing this rebuild on the Mopar Muscle article(resto to Rad) bolt on 117 HP on stock 383.
I want to keep my 906's and put a set of KB400 pistons in. I need advice/help with decking the block. Do I need to?? I was told to use a .020 shim head gasket and that would put me at 9.5:1 on compression. Does this sound accurate/correct??
Was also told this set-up would help with quench.
Next part or the puzzle the cam. The article says to use the Comp XE285HL-10( My car is a auto with 3.91's, '68 Coronet) w/the stock valve train and comp's PN 924 dual valve springs.
Headers..Hooker 1 7/8
Carb..850 Demon
Intake...Mopar perf. M-1
Should I have the rotating balanced??
Heads I need too know what size valves should I put in. I am sure I will need a valve job..any recomedations??
The article said this was a easy 450 HP.
Anyone have any input or suggestions I would greatly appreciate it. This will be my 1st engine without my dad so I will have LOTS of questions.
And please don't tell me to just get a 440. I have my sights set on my lowly 383 for now!!
Thnx Chuck
Instead of telling you what you should do I'll answer your questions ...
first off that article was done on a dyno known to be a little HAPPY so don't take the article HP numbers as accurate .
decking the block , unless it's a mess for a budget build save your money .
KB400's , NO QUENCH with a 906 . the dome is in the wrong place for that so decking is again a waste of time and money, but you'll get 9.5 - 10.0 compression .
balancing , absolutely , the factroy balance job wasn't that good and KB's are lighter than stock cast pistons .
head work , keep the stock valve sizes , hardened exh seats and a good valve job , that's still going to cost you close to 1k .
cam , ???
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Re: 383 Guru's need help w/budget rebuild..
[Re: JohnRR]
#304998
05/02/09 01:06 AM
05/02/09 01:06 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Quote:
I want to do a budget rebuild on my 383. I have a 440 tucked away for a future stroker. I don't have the coin for that right now, and I want to get my car on the road.
Here is what I have freshened up .030 block, rods have been recon/new hardware.906 heads need looked over and gone thru.Crank has been magged polished and all the journals are standard.
I am basing this rebuild on the Mopar Muscle article(resto to Rad) bolt on 117 HP on stock 383.
I want to keep my 906's and put a set of KB400 pistons in. I need advice/help with decking the block. Do I need to?? I was told to use a .020 shim head gasket and that would put me at 9.5:1 on compression. Does this sound accurate/correct??
Was also told this set-up would help with quench.
Next part or the puzzle the cam. The article says to use the Comp XE285HL-10( My car is a auto with 3.91's, '68 Coronet) w/the stock valve train and comp's PN 924 dual valve springs.
Headers..Hooker 1 7/8
Carb..850 Demon
Intake...Mopar perf. M-1
Should I have the rotating balanced??
Heads I need too know what size valves should I put in. I am sure I will need a valve job..any recomedations??
The article said this was a easy 450 HP.
Anyone have any input or suggestions I would greatly appreciate it. This will be my 1st engine without my dad so I will have LOTS of questions.
And please don't tell me to just get a 440. I have my sights set on my lowly 383 for now!!
Thnx Chuck
Instead of telling you what you should do I'll answer your questions ...
first off that article was done on a dyno known to be a little HAPPY so don't take the article HP numbers as accurate .
decking the block , unless it's a mess for a budget build save your money .
KB400's , NO QUENCH with a 906 . the dome is in the wrong place for that so decking is again a waste of time and money, but you'll get 9.5 - 10.0 compression .
balancing , absolutely , the factroy balance job wasn't that good and KB's are lighter than stock cast pistons .
head work , keep the stock valve sizes , hardened exh seats and a good valve job , that's still going to cost you close to 1k .
cam , ???
I agree and the stock size vales will work fine with the mild combo you are building. I like to assemble the shortblock with four pistons in each corner (dont need the rings for this) and then check the piston depth on the four corners. It tells you 2 things real quick which is how square the block is to a point by comparing the piston depth's and you can calculate the comp real easy with the heads cc'd and the piston depth. Then you will know if you need to deck the block to square it or for comp. You can do the math but that will give you the real number's. As for the cam I would stay mild like about 220 to 230 max at .050 and no more then .500 lift. Good luck , Ron
Last edited by 383man; 05/02/09 01:09 AM.
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Re: 383 Guru's need help w/budget rebuild..
[Re: 383man]
#304999
05/02/09 09:03 AM
05/02/09 09:03 AM
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Joined: Apr 2007
Posts: 871
WA 98043
thecarfarmer
super stock
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super stock
Joined: Apr 2007
Posts: 871
WA 98043
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If you have to put $$$ into the stock heads, I'd buy stealths.
If you can get by w/ the orig. valves... hog the stockers out and lap the valves.
Depends on how good of parts you're starting with.
If you go for the Stealths, you can always swap 'em on the 440...
-Bill
Seduce the attractive, and charm the rest.
******
489 C.I.D., roller cam, aftermarket heads, tunnel ram, stock '54 Dodge rear axle assembly: which of these doesn't belong?
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Re: 383 Guru's need help w/budget rebuild..
[Re: thecarfarmer]
#305000
05/02/09 09:34 AM
05/02/09 09:34 AM
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Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
moparrulzzz
OP
top fuel
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OP
top fuel
Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
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Well I guess my bubble is burst!!  If I were to get a set of those Stealth heads(which I am a bit leery) what piston would I use?? 383 man when you say to check on all four corners of the block to check it for being square do you mean doing it with whatever piston I go with??
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Re: 383 Guru's need help w/budget rebuild..
[Re: JohnRR]
#305001
05/02/09 09:38 AM
05/02/09 09:38 AM
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Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
moparrulzzz
OP
top fuel
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OP
top fuel
Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
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Quote:
Instead of telling you what you should do I'll answer your questions ...
first off that article was done on a dyno known to be a little HAPPY so don't take the article HP numbers as accurate .
decking the block , unless it's a mess for a budget build save your money .
KB400's , NO QUENCH with a 906 . the dome is in the wrong place for that so decking is again a waste of time and money, but you'll get 9.5 - 10.0 compression .
balancing , absolutely , the factroy balance job wasn't that good and KB's are lighter than stock cast pistons .
head work , keep the stock valve sizes , hardened exh seats and a good valve job , that's still going to cost you close to 1k .
cam , ???
Please tell me what you would do John if this were your motor and strapped for cash. I would like all the opinions I can get.
Thnx!!
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Re: 383 Guru's need help w/budget rebuild..
[Re: moparrulzzz]
#305003
05/02/09 11:05 AM
05/02/09 11:05 AM
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Joined: Jan 2003
Posts: 1,307
BC, Canada
Black_Bee
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,307
BC, Canada
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I had a 383 built fairly similar to that Mopar Muscle article... well, I used the regular Comp XE284 instead of the HL version and had more compression. Anyway, mine was a dog with 3.91s and a 2800 converter. It made barely any vaccuum, and it stalled whenevestop pulled up to a stop sign. I swapped the cam out for a much smaller one (232/242 solid) and picked up around 1 around second in the 1/4. Dyno articles are great, and the author of that article in particular really knows how to build an engine... but a magazine article doesnt give you a good idea for how the engine will behave in a car on the street.
Paul
'69 Super Bee 383 EFI Turbo
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Re: 383 Guru's need help w/budget rebuild..
[Re: NITROUSN]
#305005
05/02/09 11:23 AM
05/02/09 11:23 AM
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Joined: Jan 2005
Posts: 1,647
IL
71383beep
top fuel
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top fuel
Joined: Jan 2005
Posts: 1,647
IL
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The most overlooked issue with the 383 is there anemic compression. I too built my 383 like mopar muscle said and had a total dog for a motor. Turns out with 906 heads and KB162 pistons the CR was around 7.8:1.  I ended up rebuilding again after squaring up the block a bit and working over a set of 516 closed chamber heads. Now it is at a real 9.2:1. Cheapest way in my opnion would be to get closed chamber heads, aftermarket, 915, or 516 heads will do fine. Try also not to overcam it too. I am running comps version of the mopar .474 cam and it has good idle and pulls very well down low. The 850 Demon is WAY TOO BIG! I am running a 650 mighty demon and it could use more up top, but the off idle snap is very nice around town. I would say 750 max for a streeter stock stroke 383. The 1 7/8 headers are on the big side too, but if you are going to build a stroker or a 440 later they will work fine for now.
'73 GK6 Challenger Rallye - 340 4-Speed
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Re: 383 Guru's need help w/budget rebuild..
[Re: moparrulzzz]
#305006
05/02/09 12:06 PM
05/02/09 12:06 PM
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Joined: Jan 2003
Posts: 5,486
SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Here's a combo I used for a long time, still do. This was before I had a dyno, and in the car it pulls hard and makes great TQ and HP.
Only difference now is I use the 440 source heads and highly recommend them. Use their head gaskets and you'll be fine.
KB 162 pistons
440 source heads. I shim the springs up some.
Mill them so you have 80cc (about .020 off).
Compression will be 9.2 with their gasket and no decking. If you want more you can deck the block some.
Comp XE268 cam, can use stock rockers.
RPM intake
750 holley DP
1 3/4 hooker headers
Balancing is highly recommended!
Use a nice 9 keyway timing set so you can advance the cam 6°. This really helps the engine come alive and is very important to this build!!!!
Use a good dist. that you can lock out the timing so it's fully advanced even at idle.
On my dyno, this engine will crank out a little over 400HP and with head porting about 430HP.
In the car, it rips!!
Brian
Brian Hafliger
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Re: 383 Guru's need help w/budget rebuild..
[Re: CR8CRSHR]
#305008
05/02/09 09:23 PM
05/02/09 09:23 PM
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Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
moparrulzzz
OP
top fuel
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OP
top fuel
Joined: Feb 2003
Posts: 1,679
Mansfield,Ohio
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Thnx everyone who took the time to read and respond to my question. I have a little to chew on. OU812 I will be sending you a PM, I have a few questions for ya! Anyone else have anything to add I would like to hear it. Chuck
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Re: 383 Guru's need help w/budget rebuild..
[Re: moparrulzzz]
#305010
05/02/09 10:49 PM
05/02/09 10:49 PM
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Joined: Jul 2008
Posts: 610
Boise
Moparteacher
mopar
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mopar
Joined: Jul 2008
Posts: 610
Boise
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I have a new set of KB 162's .030 over in need of a new home. They are UN-modified. These were used for mock-up only and then put back in the box. No dings, no dents, no drops, no scratch's. If ya want them I'll sell them to ya for half of what they go for new. plus shipping. Let me know if you are interested. Gary. gary.weaver@csn.edu
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Re: 383 Guru's need help w/budget rebuild..
[Re: 1_WILD_RT]
#305011
05/03/09 12:17 AM
05/03/09 12:17 AM
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Joined: Jan 2003
Posts: 75,082
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
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Quote:
If your buying pistons why would you choose the KB162? The KB400 is 11cc larger so it bumps the C/R almost a full point.... What truely puzzles me is why there are so many piston choices fo a 440 which Chrysler made about 750,000 of but nothing well thought out is avalible for the 383 which Chrysler made over 3,000,000 of.. Just a basic flat top with a C/H of 1.93 & 4cc valve notches would give 9.3ish with an 84cc chamber..
BTW I just did the math on KB162 & 80cc chamber, without decking the piston sits about .028 in the hole & that works out to 8.95 C/R 72cc will get you 9.65
And using 84cc chambers but KB400 pistons gives you 9.45
The KB162 is the LAST piston I would use in a 383 , and that would only be because I couldn't get a piston maker to make me a custom piston for my 383 build . If you don't deck the block and use the specified gasket for the steatlhs guess what ... STILL NO REAL QUENCH , the KB is .024 in the hole AND it has a CANYON like valve notch of 5cc, total overkill.
I'd use the speedpro 2315 before using the KB , the CH is .012 higher, not optimum quench but .050ish is better than over .060.
Diamond makes a piston but for some odd reason they have it's CH at 1.916 , between the KB and the speedpro but with smaller valve reliefs, but they are pricey, I'm going to have them make me a set that will have the piston .020 above the deck .
For stockish rebuilds the low deck mopar big block is treated like the red headed step child , not much different from the members of this forum who will tell you to just build a 440 .
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Re: 383 Guru's need help w/budget rebuild..
[Re: JohnRR]
#305012
05/03/09 12:46 AM
05/03/09 12:46 AM
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Joined: Jan 2003
Posts: 5,486
SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Sure you could go with the KB400 piston, but I prefer to zero deck the block and run the 162. I'm not sure if he has all that in the budget or not... Either way, with the 383, you use a small cam and advance it more than normal and it will reward you with a strong punch! I'm in SoCal, at sea level, with craaaaaap 91 octane so I have to be very carefull of what I do. Not to mention we have 120°+ days in the summer 
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Re: 383 Guru's need help w/budget rebuild..
[Re: JohnRR]
#305013
05/03/09 12:46 AM
05/03/09 12:46 AM
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Joined: Jan 2003
Posts: 9,407
Brantford Ontario
69_SIX_PACK
master
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master
Joined: Jan 2003
Posts: 9,407
Brantford Ontario
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I would forget about trying to budget build a 383 and look for a good used 383/440 and drop it in and go. There always seem to be some decent deals and you being in Ohio there should be a few to choose from. My  Dave
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Re: 383 Guru's need help w/budget rebuild..
[Re: 69_SIX_PACK]
#305014
05/03/09 01:28 AM
05/03/09 01:28 AM
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Joined: Feb 2003
Posts: 10,226
Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,226
Someplace you aren't
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I agree, if the 383 isn't going to do it for you, don't waste anything on building it. You can do a chain and gasket rebuild on pretty much any 440 and have good results. It might black the oil in 500 miles but who cares? I did that and had at least 10,000 miles of fun with one a few years back. 
I want my fair share
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