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stall speed for proposed 383 build

9K views 50 replies 8 participants last post by  twinpilot001 
#1 ·
going to finally build the 383 for my 1985 monte carlo ss as soon as i get the garage space to make the swap. it has a 200r4 od trans and 3.73 rear end.

I already have the block, a brand new scat 9000 crank, 4340 scat i beams, probe d shaped 12cc pistons. 64cc dart iron eagles with 200cc chambers and an eddy rpm intake on my 355 now im planning to just swap the entire top end over. I have a lunati 60104 cam and lifters new in box.
.504/.525 lift 233/241 duration at .050. I want this to be a hot street/strip motor and will be building up the suspension to match. lunati recommends a 2800+ stall, i was just wondering if a 3500 stall would be better for the strip while still streetable.

anyone running similar combos? thanks.
 
#38 ·
Im posting from phone,pc in for annoal,lol.
ok,I owned a couple high 11.s street cars,and my current car
should runs faster.
none of those cars had flat tappet hyydraulic cams.
we have used dart sportsmans to run low 11.s,they were heavily ported,small solid
roller,ported holley carb,ported vic jr intake,2.05 valves,1 3/4 headers
powwr glide,5000 stall,488 gears,2950 pound gen one camaro
slappeer bars,full frame,race gas,355 cube.
best time,10.9s,close to 120

what ever you have in your car that is less will tell you how much slower you will be
,our car also has father son generation of suspension tuning
 
#39 ·
i know this thread retired a week or two ago, but i just dug up a thread where techinspector did a dynosim for a guy running 10.4:1 383 with the same lunati 60104 cam. (he is running procomp alum 210 heads, i am running dart iron eagles 200cc). The hp/tq numbers and flow numbers tech used are as follows..

RPM HP TQ
2000 155 408
2500 196 412
3000 249 435
3500 309 464
4000 366 480
4500 409 477
5000 446 468
5500 455 435
6000 431 377
Peak volumetric efficiency 96.4% @5000
Peak BMEP 189.3 @4000
Head flow used for this pull...
.100 63 52
.200 117 98
.300 163 132
.400 204 162
.500 230 180
.600 248 189

with the flow numbers bygddy dug up on out of the box iron eagles, i should be making a reasonable amount more power. 30+ cfm from .300 lift on, without any of the clean up

The flow numbers on the Darts show
.200" 130/109
.300" 194/158
.400" 242/198
.500" 274/208
.600" 283/214
 
#41 ·
I don't think stall convertors and street mix. I put a 3200 stall in a 74 vette and hated every second of it. It all sounds good but in the real world it doesn't produce very good results. If your just wanting to limp it to the strip and back then go for it, but if your planning on playing around on the street don't. Everyone I know that has used a stall for the street has the stall sitting on a shelf in their garage.
 
#45 ·
Vette had a 3.08 rear and the 3200 stall was recommended by TCI support around 15 years ago. Finally sold for $200 after sitting in the shed for 5 plus years. Everyone that I have spoke with that had actually used a stall on the street hated them. This was a computer tech support guy, couple different mechanics, transmission specialist that rebuilt my turbo 400, and most recently a contractor that use to drag race for 10 years. The drag racer told me ,just last week, that stalls were for the strip not the street.

It's great if any of you are having good results but I'll stick with stock on the street. Convertors work on slip and that's what you get. I find it really hard to believe a 5000 stall could be any fun on the street.
 
#46 ·
And you would be right about the 5000stall not be much fun on the street (I define fun different the most) but unfortunaly the rest of your post, along with the rest of your assortment of "car guys" is just wrong and its poor information. By definition your version of a street motor must be fairly weak as well if you "don't beileve" in a quality stall converter.
 
#47 ·
first,all converters have a stall speed,even factory.Not all factory stall speeds are the same.You did not say what year your Corvette was. obviously it was not a hot engine.
If you used a modern automatic with a 3,000 rpm stall and a lock up feature it would be a surprise how nice they work.
Higher stall converters are for acceleration from stop,not highway cruising,not for road racing,not for touring,not for maximum gas mileage.High stall converters are for high performance engines and quick accelerating cars.
A corvette with 3.08 gears and a 3200 stall converter suits absolutely no purpose.That would ruin the cars performance.just cant immagine how that combo ever happened?
 
#48 ·
I'm not going to disagree with the last couple post.

The 3200 stall was recommended by the "professionals". Not only did the TCI tech suggest the 3200 stall, so did a couple salesmen at the drag strip. Probably closer to 20 years ago, the 1974 Vette (still have it) had a 3.08 rear, turbo 400, 11 to 1 pistons, comp cam 270, hogged out 882 heads, edelbrock rpm manifold and 600 cfm carb. Yes, not a hot engine but this is what they said would work best on the street with this combination.

It's kind of funny that anyone ,I've talked to face to face ,that has installed a stall convertor in their car didn't like them on the street.
 
#50 ·
I think the big problem with the stall converter you had was the recommendation of a 3200 for a car with a 3.08 rear gear. A 2500 stall would have been more appropriate to get the car up on the converter at the rpm your car cruised at. I'm not sure why the tech sized your converter that high, unless he didn't know what gear you were running in the Vette, and was just sizing it on the engine specs.
I'm running a 2500 stall behind my TH350/327 combo, with 3.73 rear gears, and I wish I had gone with a 3000-3200 range. Any converter's stall speed must be workable for the engine, and rear gears, or it will just not be as efficient, or pull too much at stop lights if the stall speed is too low.
 
#49 ·
quote"It's kind of funny that anyone ,I've talked to face to face ,that has installed a stall converter in their car didn't like them on the street"

those people most likely didnt have the whole car set up for fast launches and quick acceleration.Its like putting a tunnel ram and dual 4s on a stock street engine,its the wrong application

not picking on your car highvolt,but,
11:1 and a small 600 cfm carb,your engine probably has the same or close to the same power as before the rebuild,,,
We can help you here
 
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