383 chevy for 11.9 1/4 mile 3350lb car help - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-01-2010, 09:57 PM
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383 chevy for 11.9 1/4 mile 3350lb car help

Gidday, you guys helped me out that much last time I thought I'd come back for a second go. My car weighs about 3350 with driver and gas in it and I am attempting to break it into the 11's. Local engine builder believes I will need 500hp but I am going to try no matter what.
Just stuck on gearing/cam and carb..
It is going to be street legal, driven to work on Fridays and for a cruise on Sundays but will be strip driven often so not worried if car is hard to drive on the street. As long as it is able to be driven on the street.
I don't plan on Nitrous but the door is always open for a small shot later down road. But short block is 385 chevy, (40over), will be leaving about 5" deck, 2 relief valve pistons (-5cc), heads are sportsman 2's,bowl blended mild porting (heads are here to stay unfortunately), team g intake (also here to stay)have a 650dp holley hp carb without the choke tower and downleg boosters but will be upgrading to 750 or 650 mighty demon down track.lifters are rhodes lifters, Am undecided on camshaft, either xe284 (240/246 & .050 .507/.510 lift) or Voodoo 60105 ( 241/249 & .050 .525/.546 lift) with 1.5 rockers.. Lunati's website states I will require a 3500 stall. Would this particular cam get away with a 3000rpm stall with the 383 sucking up some duration and the rhodes lifters? lr would I be better going to xe284 and using 1.6 rockers bringing the lift up to a similar level as the voodoo. The street tyre is only 25" but will get my hands on some 27" strip rims/tyres.. So with my shortblock/heads/intake that I own what gearing/cam/carb do i require to get my car 3350lb into the 11's. Any help is appreciated..As I said my engine builder believes it isn't possible but Im sure there is a way to get 1.6-1.8 60 foot times and top speed of 115mph should nearly get me there..
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Old 02-04-2010, 09:51 AM
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No idea what car you have or the rear suspension, but for comparison sake, a similar weight Camaro of mine short timed 1.70's flat w/nothing more than L60 McCreary tires (8" rim, ~9.5" tread), CE adjustable drag shocks, 3.31:1 gears, TH400, Pont. 455. ET was 12.6-ish, so you might need a bit less short time than that.

You didn't say what your 1/4 ET is, so it's hard to suggest much w/o knowing how far off you are now.

Need details! What gear, tranny, suspension. And you'll need all of at least 3500 stall- and a cam and CR that compliments that- to run 11's, IMHO.

The Rhodes lifters won't even be part of the picture when drag racing- you'll be past where they 'work' as soon as you hit the throttle. They will help you when on the street, though. I used them (intake only) on the 455 engine above.
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Old 02-04-2010, 10:21 AM
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I would recommend a tall tire for the street and a shorter slick, both will help the gear ratios for the purpose they are intended for,
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Old 02-04-2010, 12:05 PM
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this sound similar to my set up
i have a 3500lbs car with a .040 383 ie=385, mine is .020 decked with 18cc D-dished pistons (putting the piston in the whole about .005), i have DART iron Platinum heads that have been angle milled .040 given them about 58.5cc CB's, and they have had the the casting cleaned up and bowl blended. with a .039 gasket it's right at .044 quench and i have a 10.4:1 compression ratio. i run a hwrds solid flat tappit cam; 284/292-242/250, 106/110, .560"/.560" corrected lift (due to the 1.6 roller rockers), victor JR intake, 750cfm DP, HEI dist. est power from the motor is 525hp/ 500tq, i'm shifting at 6200rpm. i use a well built 700R4 trans, 3500-3800 hughes stall, after market 12bolt with lockers and 4.10's and a P295/65R15 (29x11.5 ish) M/T ET streets. i have lakewood 90/10 shocks and struts, adj panhard bar, lakewood action/lift bars, upper and lower control arms.

im still getting used to it as i got it all together for the very end of the 09' racing season and only got it out there about 2-3 times but i got like 5-6 runs on it. im getting 11.70's @ 115-117mph, i think with some adjustments and some more practice i will see 11.50's.

i wouldn't run the 1.6 rockers on either of those two cams due to their agressive ramp rate, and if you plan on doing some strip racing i would seriously lean toward a solid cam as they are made for the abuse.
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Old 02-04-2010, 12:39 PM
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you didn't list headers and exhaust...

And a solid cam may be better for this application, possibly a hydraulic roller?
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Old 02-04-2010, 04:21 PM
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Quote:
Originally Posted by ap72
you didn't list headers and exhaust...

And a solid cam may be better for this application, possibly a hydraulic roller?
the OP or me?

mine are ceramic coated Hooker super comp headers, i believe they are 1 7/8 primaries and 3 1/2 collector, 3" dauls going to 12" dynamax bullets
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Old 02-05-2010, 01:45 PM
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Gidday, thanks, the car hasn't been raced yet, in its final stages of being built, just got to paint it and put the motor together. I already have the heads, intake, shortblock and 9" housing. Thats why I came in here, as I am building it to try get it to run 11.9. I thought someone in here may be able to give me advice on the gearing/cam and stall to go with my sportsman2 heads/385 block/team g intake to get my holden (australian car) 3350 lbs with me in it down to the target time. So go back to the 1.5 ratio if I use one of the cams I mentioned.Or keep the 1.6 with solid cam? will a cam in the mid 240s duration get my car down to that time. Just a th350 tranny, basic nine inch will be using lsd centre..there is a picture of my car in my profile if it is accesable straight after the first time it was painted. if you want an idea on size .
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Old 02-05-2010, 01:48 PM
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it has headers and twin 2 1/2's but will have to measure headers and get back to you... Really all I need to know is can a 3350lb car with driver run 11.9 seconds with 385 chevy around 11.0 compression, sportsman 2 heads basic port job/bowl blended, team g intake matched, 750dp run and still be able to be driven on the street and without going to roller cam as funds don't allow for it on this build.
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Old 02-05-2010, 04:33 PM
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How about this lunati solid cam. p/n 401B1LUN 280/288 duartion 247/255 at 0.050 .525/5.4 lift 106 lsa 2800-7000rpm 0.26lash needs 2800-3500 stall the 383 would suck up some duration apparently so would this work with my set up???chuck in some 3.9 gears and small 25" tyres would be near equivelant of 4.1 gears with tall tyres?????
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Old 02-05-2010, 07:01 PM
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The Lunati cam and the rest of your planned build should get you where you want to be if you are a decent tuner.

Don't skimp on the quality or go to the low side on the converter stall, if your not spending $400+ on the converter you are likely not getting a good enough piece. Don't buy a shelf converter, get a custom built for your combo.

Rear suspension needs to be up to the task, you will need to sixty foot in the 1.6-1.7xx second range to do the job.
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Old 02-05-2010, 07:25 PM
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Quote:
Originally Posted by ericnova72
The Lunati cam and the rest of your planned build should get you where you want to be if you are a decent tuner.

Don't skimp on the quality or go to the low side on the converter stall, if your not spending $400+ on the converter you are likely not getting a good enough piece. Don't buy a shelf converter, get a custom built for your combo.

Rear suspension needs to be up to the task, you will need to sixty foot in the 1.6-1.7xx second range to do the job.
Good advice^^^^^^^^^^^
I would say a 4000 converter and 4.56 gears with a solid lift cam. What size tire are you going to run?
Also might want to look at carburators. 650-750 might be a bit small.
What are the specs on the heads?
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Old 02-05-2010, 08:10 PM
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You can jump into the 11's easily with more stall and a good hook. I've seen 8.5:1 motors run 12's with a 4000 stall...

K
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Old 02-05-2010, 09:06 PM
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its running on 17" boyds on the street measuring 25" tyre but will race with 15's and a 27" tyre at the least...750dp too small? 4000rpm stall, is that still driveable on the street. Heads aren;'t the best, flowing mid 260's at .500 and exhaust side got a bit more work as it wasn't flowing very good on the bench. Exhaust flowing around 200cfm, that was why I was looking for a bit more exhaust on the cam just to bring effeciency up. I just keep believing there is a chance to run under 12 without having 500hp and still being able to drive it on the street, even with a bit of extra effort if needed...I don't even know where the closest place over here would be who would do cusstom converter..
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Old 02-05-2010, 09:45 PM
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Quote:
Originally Posted by belairheaven
its running on 17" boyds on the street measuring 25" tyre but will race with 15's and a 27" tyre at the least...750dp too small? 4000rpm stall, is that still driveable on the street. ..
I am driving my car on the street with 4500 converter, 4.56 gear and a 950CFM carb. 12:1
tire and gear will be a huge step for you. You would be suprised at how well a gear and tire change will effect a car.
My old set up went 12.50's all day with a 9.25:1 350 with edelbrock heads, intake and 750 cfm carb & hyd flat tappet cam. Prolly around 430HP.
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Old 02-05-2010, 10:54 PM
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383 chevy for 11.9 1/4 mile 3350lb car help

you should be there bud! my old car-360 full roller,5500 stall,456 gears ran 1.55-160 60fts.-11.70s allday(3500lb)camaro. new combo- no compression 454, comp 230-230 cam ,3500stall, 342 gears, peanut ports,(3600lbs) runs 1.64-1.65 60fts, w/ a best mph of 107. old combo was around 112mph. common denomitor w/ both cars was a holly 9381 830 annular dp. this carb sells for 420$ in both jegs and summit,and i cant say enuff about it. jetting for the radical 360 roller was 83square, but the milder 12.40 combo(454) is box stock 77square. both combos were fully streetable, while the 11sec. car only got around 5-6mpg(converter&gears), the mild 454 got over 14mpg w/ a2500stall,and 12+ w/ the 3500 super street fighter. i run a digital summit digital a/f ratio gauge, and while the 830 runs a tad on the rich side, it stabilizes to 14s a/f @ part throttel cruze,and is spot on going thru the traps. this carb will get u there,cheap! 79z
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