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Re: 383 performance upgrade questions
[Re: greg383]
#815691
09/27/10 12:58 PM
09/27/10 12:58 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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The hardest part about building a 383 is piston choice. Because they are all fairly short in terms of the deck height. For a street engine I'd run KB400s and have them set to be proud of the deck by .010. That should give you close to 10.25:1 assuming the heads are milled a little and the chambers are somewhere around 88cc and the gasket used is the std FelPro blue. Then stick a modern grind cam in it. The problem is, blueprinting a 383 is not a "budget" build. Then again, 400+hp from one is not a budget build either, IMO anyway. In any event, pay attention to actual compression figures vs what you read it "will" have. Because unless you blueprint the parts, you won't have anywhere close.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 383 performance upgrade questions
[Re: moper]
#815692
09/27/10 01:09 PM
09/27/10 01:09 PM
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Joined: Nov 2004
Posts: 843
Suffolk,VA
ireland383
super stock
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super stock
Joined: Nov 2004
Posts: 843
Suffolk,VA
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Yeah, the KB400 is the only real choice for any decent compression. My pistons wound up at .024 below the deck and with an 84cc head, .039 head gasket, I was able to squeeze out 9.25:1. I'm around the 400 hp mark. You'll need to make sure parts all work together. Rear gear, stall (if auto), headers, cam, and carb. Good luck!
Last edited by ireland383; 09/27/10 01:10 PM.
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Re: 383 performance upgrade questions
[Re: Mr.Yuck]
#815694
09/27/10 01:35 PM
09/27/10 01:35 PM
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Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
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Quote:
any reason you HAVE to do that motor? I'd check online and here for a done short block, or something done. If you are going thru all the trouble of rebuilding an engine you might as well go find a 440 and rebuild it. It's going to cost the same and you'll get much more out of it.
That said Summit, Jegs and PAW have some pretty good rebuild kits. I'd look online for things like used headers, intake, carb and so on. You can save a bunch buying used.
I knew when I saw your name on the bottom of the list on the thread listing page that you were going to tell the guy to build a 440 ... 
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Re: 383 performance upgrade questions
[Re: moper]
#815695
09/27/10 01:43 PM
09/27/10 01:43 PM
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Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
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Quote:
The hardest part about building a 383 is piston choice. Because they are all fairly short in terms of the deck height. For a street engine I'd run KB400s and have them set to be proud of the deck by .010. That should give you close to 10.25:1 assuming the heads are milled a little and the chambers are somewhere around 88cc and the gasket used is the std FelPro blue. Then stick a modern grind cam in it. The problem is, blueprinting a 383 is not a "budget" build. Then again, 400+hp from one is not a budget build either, IMO anyway. In any event, pay attention to actual compression figures vs what you read it "will" have. Because unless you blueprint the parts, you won't have anywhere close.
Dave you are on track with the compression of the 383 , I have been doing a little revision on my 383 and realized a goofed on my calculation , missed the sign for the piston above the deck. If you put a flat top at zero deck and cut the heads to 80 cc wit ha .021 shim gasket you get just over 10.0 for compression , the flat top will be better the choice and it's cheaper to cut the head than the block I would think, though the block needs to be squared , you just cut off less .
The bad thing is the only piston choices are KB162 , .024 in the hole and a 5cc canyon for a valve relief , speed pro , .015 in the hole but no valve reliefs , or a Diamond , .019 in the hole and smaller than the KB valve reliefs but they are $$$.
400 to 450 HP is not a budget build on a 383 , if you think it is because you read that mopar muscle mag article that's on the net you need to know the dyno that test was run on was known to be HAPPY ...
Maybe a 440 is a better choice ???
Last edited by JohnRR; 09/27/10 01:44 PM.
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Re: 383 performance upgrade questions
[Re: JohnRR]
#815696
09/27/10 01:48 PM
09/27/10 01:48 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
Quote:
The hardest part about building a 383 is piston choice. Because they are all fairly short in terms of the deck height. For a street engine I'd run KB400s and have them set to be proud of the deck by .010. That should give you close to 10.25:1 assuming the heads are milled a little and the chambers are somewhere around 88cc and the gasket used is the std FelPro blue. Then stick a modern grind cam in it. The problem is, blueprinting a 383 is not a "budget" build. Then again, 400+hp from one is not a budget build either, IMO anyway. In any event, pay attention to actual compression figures vs what you read it "will" have. Because unless you blueprint the parts, you won't have anywhere close.
Dave you are on track with the compression of the 383 , I have been doing a little revision on my 383 and realized a goofed on my calculation , missed the sign for the piston above the deck. If you put a flat top at zero deck and cut the heads to 80 cc wit ha .021 shim gasket you get just over 10.0 for compression , the flat top will be better the choice and it's cheaper to cut the head than the block I would think, though the block needs to be squared , you just cut off less .
The bad thing is the only piston choices are KB162 , .024 in the hole and a 5cc canyon for a valve relief , speed pro , .015 in the hole but no valve reliefs , or a Diamond , .019 in the hole and smaller than the KB valve reliefs but they are $$$.
400 to 450 HP is not a budget build on a 383 , if you think it is because you read that mopar muscle mag article that's on the net you need to know the dyno that test was run on was known to be HAPPY ...
Maybe a 440 is a better choice ???
The dyno operator heard 383 & thought he was working on a Chevy stroker so he plugged in the Chevy Big HP code... How do you suppose every SBC to go on dyno for the magazines makes 700+ hp....
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Re: 383 performance upgrade questions
[Re: JohnRR]
#815697
09/27/10 01:48 PM
09/27/10 01:48 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
any reason you HAVE to do that motor? I'd check online and here for a done short block, or something done. If you are going thru all the trouble of rebuilding an engine you might as well go find a 440 and rebuild it. It's going to cost the same and you'll get much more out of it.
That said Summit, Jegs and PAW have some pretty good rebuild kits. I'd look online for things like used headers, intake, carb and so on. You can save a bunch buying used.
I knew when I saw your name on the bottom of the list on the thread listing page that you were going to tell the guy to build a 440 ...
he doesn't have to, but it makes more since from a power perspective. He could do a 400 or a stroker too.... Depends on what the engine needs and what he wants it to do. If it needs the crank turned, bore, decked and bla bla bla, it cost the same to do it to a 440. If all he needs is a hone, set of pistons and rings than do the 383, but if it needs a ton of work, do it to a biiger engine.
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Re: 383 performance upgrade questions
[Re: greg383]
#815699
09/27/10 08:31 PM
09/27/10 08:31 PM
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Joined: Oct 2009
Posts: 276
Temecula, Ca.
zzyzxpat
enthusiast
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enthusiast
Joined: Oct 2009
Posts: 276
Temecula, Ca.
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Look at 440 Source or one of the other stroker kits. For the buck, it's not bad.
" The last official act of any goverment, is to loot the treasury" George Washington
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Re: 383 performance upgrade questions
[Re: greg383]
#815701
09/28/10 10:10 AM
09/28/10 10:10 AM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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What is the budget figure you're working within?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 383 performance upgrade questions
[Re: greg383]
#815704
09/28/10 10:59 AM
09/28/10 10:59 AM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
I was hoping to put the biggest cam I could that will work good with the 906 heads.The car is an automatic so im stuck with a low stall stock converter as well.At this point it looks like a set of KB400 pistons are the best bet for pistons,but what machine work to the block and heads? and what head gaskets and cam lift?
Why are you stuck with a low stall stock converter? Mancini Racing has some affordable converters.
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Re: 383 performance upgrade questions
[Re: greg383]
#815707
09/28/10 11:56 AM
09/28/10 11:56 AM
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Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
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I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
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Quote:
They really like to drive the car alot,so I have to keep things with in some reason.I mainly didnt want to put a huge stall converter in it just for driveability
thats false - I run a 3800 stall dynamic with 3.23's and it drives like a stock converter = till you nail it!
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Re: 383 performance upgrade questions
[Re: forphorty]
#815708
09/28/10 12:13 PM
09/28/10 12:13 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Dont be afraid to go as far as a 3500 converter for the street. I run a 10" converter rated at 3500, and its just fine on the street, although if gas mileage is of concern, you may not want this much converter (??). Point is, if you want to get 400 HP out of a 383 (and that's not going to be easy with stock heads), and are running a 727, youre gonna need at least 3k worth of converter to go with the cam that will get you there. I did a lot of research on 383 builds, then decided to go to a 451. MAN, am I glad I did that! I built a 500 horse 451 for around 5-grand, just for comparisons sake. But here's where I'd go with the 383: KB400's are the right choice with the 906's. Have the 906's milled down to get yourself about an 84cc chamber. with an .060 gasket, that should get you to right around 9.5:1. ( an .040 gasket will get you near 10:1, but thats pushing it with pump gas and open chambered iron heads). To make power from a 383, it has to be spun like a small-block, so good machine work and balancing are paramount. I'd go with main studs (have the mainline honed with this upgrade!) Cam needs to be in the 240+ duration neighborhood. I like the looks of the Comp XE284H, and the XE285. at less than .510 lift, The 284 could be run with stock rockers. If you're willing to invest in some decent rocker gear the 285 will make more power, but I wouldn't try it's .545 lift with the stock gear. Get the lifters and springs to match whatever cam you decide on, but don't go below 240*. Carb should be a holley based 750. A simple 3310 350 vacuum secondary will work just fine, but going to a higher end carb will make things easier to tune, and run a little better. Either way, a 750 is perfect for a mild street 383. I'd put it on an Eddy Perf. RPM manifold, personally, but there are some single planes that are worth looking at as well. for street use, I don't think you can beat the RPM, though. This recipe should get you to right around 400 horse, if tuned well. Hook it up to a 3500 converter, and a set of 3.73's or 3.91's, and it should be a low 13 second performer. 450 out of a street 383 is going to be tough to achieve without spending big cash. There will be much more to iron out, but thats my 2-cents. 
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: 383 performance upgrade questions
[Re: greg383]
#815709
09/28/10 12:15 PM
09/28/10 12:15 PM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
They really like to drive the car alot,so I have to keep things with in some reason.I mainly didnt want to put a huge stall converter in it just for driveability
I run a converter that stalls at about 2200 RPM's, and acts like a stock one around town and on the highway. Ran a Hughes Performance 2500 Street Master that acted like a stock one around town and on the highway. It stalled about 2500 RPM's.
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Re: 383 performance upgrade questions
[Re: DJVCuda]
#815713
09/28/10 01:27 PM
09/28/10 01:27 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
They really like to drive the car alot,so I have to keep things with in some reason.I mainly didnt want to put a huge stall converter in it just for driveability
thats false - I run a 3800 stall dynamic with 3.23's and it drives like a stock converter = till you nail it!
I need to get one of those then because my 3800 turbo action is nothing like a stock stall.
...anyway if you are stuck with that build I'd call one of the custom cam guys and have one made. Tell them what car, weight, engine, stall and gear you want to run and they will grind one up for your needs. It will probably have a real fast intake ramp so you'll need good valve springs. Your 906 heads will be fine, even better w/ 2.14/1.88 valves but the 2.08's will work. I'd run an RPM intake, Holley 750DP and headers. Should make close to 400 if you can get the compression around 10:1.
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Re: 383 performance upgrade questions
[Re: greg383]
#815715
09/28/10 04:24 PM
09/28/10 04:24 PM
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Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
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Quote:
How much should i mill the heads down to get to 84cc.Is there any piston to valve problems with .507 lift of the XE284H.Do i need to mill the block down for the 9.5:1 comp with this combo?
There is no way of knowing how much to mill the heads down till you CC the chambers to find out what they are, they could be anywhere from 88cc to 92 cc . Same for the block, you need to chose a piston. The block at minimum needs to be decked to make it square to the crank line and the same deck height side to side. KB pistons have canyons for a valve relief so that much lift SHOULD have plenty of clearance .
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Re: 383 performance upgrade questions
[Re: JohnRR]
#815716
09/28/10 05:23 PM
09/28/10 05:23 PM
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Joined: Aug 2007
Posts: 6,098
Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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average CC on stock open chambers are 90 cc, but it could be anything from 88 to 92
by each CC you must cut down 0.0042, so expect to cut around 0.030
then cut around 0.036 on intake side of heads
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: 383 performance upgrade questions
[Re: greg383]
#815717
09/28/10 05:32 PM
09/28/10 05:32 PM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
How much should i mill the heads down to get to 84cc.Is there any piston to valve problems with .507 lift of the XE284H.Do i need to mill the block down for the 9.5:1 comp with this combo?
In reality a .507 lift will be more like .490 lift if running stamped steel rockers which are more like 1.45 to 1, not 1.5 to 1.
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Re: 383 performance upgrade questions
[Re: greg383]
#815718
09/28/10 06:56 PM
09/28/10 06:56 PM
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Joined: Nov 2004
Posts: 843
Suffolk,VA
ireland383
super stock
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super stock
Joined: Nov 2004
Posts: 843
Suffolk,VA
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Quote:
What pistons are you running with the XE274H?
I'm running KB400's. The cam I'm running is a 275DEH 482 lift a little smaller than the XE274H. You should be fine with stock rockers. No issues here. 
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Re: 383 performance upgrade questions
[Re: greg383]
#815719
09/28/10 07:36 PM
09/28/10 07:36 PM
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Joined: Dec 2008
Posts: 459
pana illinois
bigblock4x4
mopar
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mopar
Joined: Dec 2008
Posts: 459
pana illinois
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Quote:
I have a 68 383 that im trying to get more power out of.Its out and on the floor and now im going through the process of finding the right parts to make power on a semi budget.I am rebuilding the entire engine.I would like to know what pistons and bore would be best.I would like to run the biggest cam that i can without having to do a custom valve train.It already has 906 heads with 2.08 intake valves.Im looking for at least 400 to 450 hp.Anyone have any ideas?
my buddy has a fresh 383,he goes by don440 on here,i think he wants to sell it,it's zero decked crank turned and polished,all it needs is balanced and assembled oh it needs painted,don't know if that will help u any just thought i would chime in,thanks
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Re: 383 performance upgrade questions
[Re: 383man]
#815721
09/29/10 08:40 AM
09/29/10 08:40 AM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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I think I'd run the XE268 or the Lunati 60302 anda factory high-stall convertor and you're done. No reason to get way exotic IMO if you're looking for a nice cruiser and not really looking to spend. You can do everything to the block, I do on my builds, but for a solid fun cruiser, you don't have to unless you want to maximize the effort and don't mind spending. Basic rebuild, blueprinting the block... If it was me, I wouldnt cut the heads more than whatever the max is that can be removed from the intake side and still seal the valve covers. Otherwise you're looking at milling an intake to fit special. Again.. How far do you want to go when cruising is th goal?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 383 performance upgrade questions
[Re: greg383]
#815725
10/04/10 02:45 PM
10/04/10 02:45 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
super stock
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super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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Quote:
If i stay under the .500 lift cam spec.Can I run the stock non-adjustable rockers and shafts.I was just going to replace with mopar performance stock non-adjustable arms and shafts
Yes,just make sure the pushrod length is suitable with a new cam that comes.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: 383 performance upgrade questions
[Re: greg383]
#815726
10/04/10 03:12 PM
10/04/10 03:12 PM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
If i stay under the .500 lift cam spec.Can I run the stock non-adjustable rockers and shafts.I was just going to replace with mopar performance stock non-adjustable arms and shafts
The stamped steel rockers are not a true 1.5 to 1 ratio, more like 1.45 to 1 ratio at best. So, for example, a .518 lift is more like a .490 lift in actuality. Stock heads with stock rockers can handle pretty much up to .500 lift, but always check to make sure.
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