Finally 8.0’s

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PG Duster

PG Duster

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I’ve posted before, I finally got my magnum 360 Duster in the 8.0’s 1.7’s in the 60’ in the 1/8 mile which should be equal to about to 12.60’s I’m starting the installation of a 100 shot Nitrous system. I will be looking for 7.50’s or faster if possible in the 1/8 mile drags. What do you guys think.

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Almost for got to give this information. 1974 Plymouth Duster, 360 magnum engine, 9.1 cr, ported EQ cylinder heads with 2.02 intake valves, mild hydraulic roller cam shaft, I don’t have the cam specs, with Edelbrock rpm airgap intake, Holley HP 750 vs carburetor, MSD ignition system, aluminum radiator, 2 1/2 inch exhaust system with Flowmaster mufflers, headers, and a built 727 trans with a 9.5” 3600 stall built by Dice Performance Converters, B&M SFI flex plate, B&M pro ratchet shifter, line lock, Calvert Caltrac traction Bars and split mono rear leaf springs and Calvert 9 way adjustable rear shocks and Yukon racing axles, a 489 3rd member housing, 8 3/4 sure grip rear end with 3:91 gears in it. 275/60 15 Mickey Thompson drag radials rear tires.
 
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I guess I don't know the altitude or heat you race at, nor the weight of your car. I will say it's not running bad, but I think if you are under a 1000 ft altitude, and semi-decent weather, it should be in the 7's already. I also would be running a double pumper without question. But yeah, spray it and you'll hit your number.
  • P.S. - I don't understand what we are voting on ....
 
Irwindale Raceway California is 370.8’ above sea level, my car with me in it weighs 3650. I did not know how to post without the voting option. Do you think a double pumper will get me into the sevens like it is? This is the carburetor I have on it. A Holley HP 750 vacuum secondary. I’m at the end of what I know to get more out of my combination, any Suggestions?

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PG Duster said:
Irwindale Raceway California is 370.8’ above sea level, my car with me in it weighs 3650. I did not know how to post without the voting option. Do you think a double pumper will get me into the sevens like it is? This is the carburetor I have on it. A Holley HP 750 vacuum secondary. I’m at the end of what I know to get more out of my combination, any Suggestions?

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Hard to say without knowing the specifics of the cam. However, I like the gear, converter, ported EQ heads, and the 5.9 magnum. I see a 7.70 or maybe even a tad quicker. Without being there in person, it's really hard to say.
 
Beautiful car :thumbsup:.

First look says it's running pretty well to me, especially if the cam is as mild as it "may" be?

What was your mph like? Would help us tell how efficient that run was.
 
318willrun said:
I guess I don't know the altitude or heat you race at, nor the weight of your car. I will say it's not running bad, but I think if you are under a 1000 ft altitude, and semi-decent weather, it should be in the 7's already. I also would be running a double pumper without question. But yeah, spray it and you'll hit your number.
  • P.S. - I don't understand what we are voting on ....
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I figured out how remove the voting option. Still learning to use the website.
 
OldmanRick said:
Beautiful car :thumbsup:.

First look says it's running pretty well to me, especially if the cam is as mild as it "may" be?

What was your mph like? Would help us tell how efficient that run was.
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84.5 mph in the 1/8th. 1.75 60’. Any Suggestions on how to make the car quicker with the combination I have would be great, before I finish the nitrous install. The cam could be stock for all I don’t know about it. I’m not sure it would et like that if the cam is stock?. When I bought the car it had a rebuilt engine and the Owner said it is a mild roller cam in it. I had the torque converter and transmission built for it.
 
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Wallace says IDEAL for your 1.75 60 is 7.95, 85.5 so you're right there, considering unknown cam. Wallace also says adding 100 (IF it will hook at the starting line) should get you to 7.39/7.40s. I think 7.50 is very realistic.
(Stuck in Arizona, missed seeing your runs)
When I get back we could arrange a loan of my 850 dp, for giggles.
 
Thx for replying. Those numbers all line up pretty well and it's looking like you're making "about" 350hp as per the Wallace calculator. Not bad in my opinion for a 9to1 milder cammed engine. All of your combo looks really good to me, meaning your whole drivetrain, engine, tires, springs, etc. I'd enjoy it just as it is, but if your willing to try the spray, have at it. Could be a lot of fun,"adventure":).

Keep in mind, i'm from a by gone era where a 12.60 small block car that "hooked" on the street could clean the clock of 75% of the big block cars with a 100 more hp. :)
 
33IMP said:
Wallace says IDEAL for your 1.75 60 is 7.95, 85.5 so you're right there, considering unknown cam. Wallace also says adding 100 (IF it will hook at the starting line) should get you to 7.39/7.40s. I think 7.50 is very realistic.
(Stuck in Arizona, missed seeing your runs)
When I get back we could arrange a loan of my 850 dp, for giggles.
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looking forward to seeing you at the track again, 850 might be too big, but worth a try. Do yo have 750 double pumper? And that Wallace computer has given some optimistic et’s see what happens.
 
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OldmanRick said:
Thx for replying. Those numbers all line up pretty well and it's looking like you're making "about" 350hp as per the Wallace calculator. Not bad in my opinion for a 9to1 milder cammed engine. All of your combo looks really good to me, meaning your whole drivetrain, engine, tires, springs, etc. I'd enjoy it just as it is, but if your willing to try the spray, have at it. Could be a lot of fun,"adventure":).

Keep in mind, i'm from a by gone era where a 12.60 small block car that "hooked" on the street could clean the clock of 75% of the big block cars with a 100 more hp. :)
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I’m old school too, I had a 71 340 duster that would get the average big block with about 100 more hp. Back in the day.

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PG Duster said:
looking forward to seeing at the track again, 850 might be too big, but worth a try. Do yo have 750 double pumper? And that Wallace computer has given some optimistic et’s see what happens.
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I've got the gold claw with the changeable sleeves off my Cortina. I think it's got 770
cfm sleeves in it, but I don't have the throttle linkage for a Mopar kick down for it.
It may not work as a footbrake carb, I ran it with a transbrake.
 
33IMP said:
I've got the gold claw with the changeable sleeves off my Cortina. I think it's got 770
cfm sleeves in it, but I don't have the throttle linkage for a Mopar kick down for it.
It may not work as a footbrake carb, I ran it with a transbrake.
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Ok, I should be able to Borrow a 750 double pumper. But thank you for the offer.
 
Kudos to 331MP. Love to see members offering help, parts for others. That's what makes this site 2nd to none in the car world.

While i would prefer a DP in your situation, i'm guessing that if your HP is running well, you may just be tinkering around the margins with a DP carb for now. Meaning i'm not sure the cost/benefit of a new one is warranted.
 
OldmanRick said:
Kudos to 331MP. Love to see members offering help, parts for others. That's what makes this site 2nd to none in the car world.

While i would prefer a DP in your situation, i'm guessing that if your HP is running well, you may just be tinkering around the margins with a DP carb for now. Meaning i'm not sure the cost/benefit of a new one is warranted.
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I’ve spent over 6 months tuning this carb and curving the The distributor at the track and on the street , I think I have it as dialed in as ot could be. And you’re probably right it’s probably pretty close to what a double pumper might do on my application.
 
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PG Duster said:
84.5 mph in the 1/8th. 1.75 60’. Any Suggestions on how to make the car quicker with the combination I have would be great, before I finish the nitrous install. The cam could be stock for all I don’t know about it. I’m not sure it would et like that if the cam is stock?. When I bought the car it had a rebuilt engine and the Owner said it is a mild roller cam in it. I had the torque converter and transmission built for it.
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I think the car is pulling evenly through the traps, but if the cam is anywhere near 224@050 or bigger, with at least .480 lift, I just think there is more in it. You are running too close to our '80 D150, and you have more going for you than us.
 
318willrun said:
I think the car is pulling evenly through the traps, but if the cam is anywhere near 224@050 or bigger, with at least .480 lift, I just think there is more in it. You are running too close to our '80 D150, and you have more going for you than us.
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I’m not sure if it’s that much duration, it sounds very mild to me. But your D150 is flying. Good job. I’ve seen you on You Tube, lots of good information you have posted.
 
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Is a stock cam in my magnum 360 set up Capable of running the ET that I am running? Just wondering.
 
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PG Duster said:
Is a stock cam in my magnum 360 set up Capable of running the ET that I am running? Just wondering.
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If you have a stock cam, that would be a good run. I just feel somebody wouldn't use those heads, and the rest of the set up and not swap a cam. But I could be wrong.
 
318willrun said:
well, i like your combo a lot. I think it has great potential.
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the Prior owner said he put a mild roller cam in it and he would send me the cam specs, I never got that information from him. Everything else he said about the car was true as I have found out from working on it.
 
I could not find my last time slips but here’s one from about a month ago. The car does it’s fastest mph and et when shifting at 5500 rpm and it has performance valve springs in it. So he must have put a non stock cam in it, unknown specs.

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Just for the sake of discussion, i think the cam installed was probably a mild off the shelf grind. Most of those had a slight increase in lift/duration, low5's/210-216 range, but maintained a 114ish lsa to be computer friendly. Makes for good vacuum, smoother idle and a flat power curve. Nice for the street, but leaves a little on the table for the strip.
 
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