There are things you can do to make the motor not care as much about exhaust restrictions, but it's all compromises. What should be done is take the 71 p/s manifold off and put a 70 on...
Duster Breaks FAST Small Block Record
- Thread starter 340sFastback
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Iam quite informed i was racing small blocks in the 70s
132 mph thru manifolds end of story
Hemi race darts were just trapping 130 in 68 69 huge slicks lighter then that duster 2 1/4 headers 4.56s 4.88s
Its a 71 already has the best intake carb
See i can pretend that you dont know the 71 intake and carb are the best like you trying to tell me about the tricking the exhaust with the cam
132 mph game over
My 73 340 4sp Dart Sport ran high 12 in FAST form and I drove it from Idaho to Brainard MN and back .
The key to success is in picking a platform that came from the factory with wide tires , good intake / carbs , light weight , decent exhaust manifolds etc .
Corvettes kick *** because of available engines , wide tires , independent suspension and low weight .
An AAR Cuda would be perfect because of the T/A heads , shorter wheelbase , staggered tires size ( G60-15 rears IIRC) , fresh air hoods and reasonable weight .
Some criteria in FAST is biased .
They won’t allow early Max Wedge cars to run 3” head pipes and uncap the dumps ….
The key to success is in picking a platform that came from the factory with wide tires , good intake / carbs , light weight , decent exhaust manifolds etc .
Corvettes kick *** because of available engines , wide tires , independent suspension and low weight .
An AAR Cuda would be perfect because of the T/A heads , shorter wheelbase , staggered tires size ( G60-15 rears IIRC) , fresh air hoods and reasonable weight .
Some criteria in FAST is biased .
They won’t allow early Max Wedge cars to run 3” head pipes and uncap the dumps ….
We built a 71 because of the intake and carb for sure. Whether it is the ultimate setup, I don't know. Quickest stock eliminator to my knowledge is a 70, and they don't even have to worry about the exhaust manifolds.
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We started with Dad's AAR. Got to 11.5's with almost zero weight reduction and had no interest in putting a bar in it so built the duster. At one point we did an a-b test at the track and threw the six pack on the duster and it picked up 3mph over the thermoquad.
furrystump
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I don’t understand, are you saying 132 mph is the limit?
iam saying turning 132 mph with manifolds is beyond impressive
race hemi darts@3100 lbs with slicks big headers and stall and 4.88s were trapping 130
Yet posters are saying they dont flow good they flow 132 mph good smh
There are lots of full race a bodys that wish they could trap 132 mph
Hell what would it run with 9 inch slicks and a 150 shot 9.6@140 with manifolds lol
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BVoelzke
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One of the fastest Duster 340s in the country running D/SA Won class at the Dutch Classic with a 10.24 and I know this car has been in the nines by the previous owner. It just makes what you do on a small tire with more class restrictions all the more impressive!
furrystump
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He needs to stay off the internet and find 100 lbs to get out of it! 
19DART66
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My thoughts on this argument is, instead of telling Brian what he already knows, through always rethinking his combo and hard work, build a car of your own and reset his record. Brian has held this record for a long time and has been resetting it almost every year since he first set it, I think he knows more than the rest of us about setting record in the FAST class while keeping the car perfectly legal under all the rules.
stroked340
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Of coarse they flow good they're hog out to the max..who's talking about headers??
Jay E.
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I might be wrong, but I "think" in FAST the appearance is what counts. It is pretty easy to make '72 heads flow like 70/71. Same with the carb and manifold. It is only in the Pure Stock class that the parts are year specific. Anyone that is running under 12.0 has really got some skills, time and money. Even though I know I won't ever be competitive, I think it is the most interesting class of drag racing and brought me back to the track. I admire the guys that are going faster, they would have been freaking heros back in the '70's with a 10 second 340 Duster. I can't think of any stock appearing muscle car (even with headers etc) back then that came anywhere close to that on stock tires. 132 MPH, wow what a ride. It must pull like a freight train.
6PKRTSE
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The F.A.S.T class racing is my favorite class of racing.
extrude a hone added 7hp bfd
furrystump
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he’s running J’s, I’m running X’s. Core shift is usually the difference maker between the two. Although X’s in full tilt effort, good core, is supposed to be a hair better. I think his might flow more than mine now. Last year not so much and annoyingly still ran 10.3’s!!!!! Over 130!
Awesome, well scienced out car. Congrats to the owners for making it go.
You can run a marathon breathing through a straw. Would it be better to be unrestricted, sure would. Tired argument or see what someone can do running this... regarding headers and manifolds. Guessing it takes in the 600hp range to get that MPH if it's around 3100-3200# at the line. I bet if they could make one change to the car for ET/MPH gains only, a set of 1 7/8+" headers would be top of the list.
When you have to work inside a box, you make do. These guys make it work.
You can run a marathon breathing through a straw. Would it be better to be unrestricted, sure would. Tired argument or see what someone can do running this... regarding headers and manifolds. Guessing it takes in the 600hp range to get that MPH if it's around 3100-3200# at the line. I bet if they could make one change to the car for ET/MPH gains only, a set of 1 7/8+" headers would be top of the list.
When you have to work inside a box, you make do. These guys make it work.
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Map63Vette
Well-Known Member
I've always thought this class was one of the coolest things in racing. I didn't realize it was actually as restrictive as it was though. I thought it was exactly what the name said "factory appearing, stock tire", otherwise no holds barred. I swear I remember seeing articles and videos about some of the crazy stuff they did like hiding nitrous lines in stock fuel lines and stuff like that, but they make it really clear that nitrous isn't allowed. Am I just crazy or did they gradually hone and change the rules over the years?
And the other thing to keep in mind is that a racecar is a full system. The engine is a very important part of it, but the suspension and dynamics are just as important if not more so to some degree. One of the recent Cleetus videos kind of pointed that out in how their 2500 hp car couldn't hook worth anything to make it down the track while their 5000 hp could stick like glue and make a full pass. Steve Morris had another video like that talking about traction control. You could have two cars run down the track and run the same ET, but one is blowing parts up left and right because the traction control is pulling timing and it's bouncing back and forth all over the place while the other car just runs steady the whole way. You have to build it all to work together. Incredible work regardless to see these cars put up those kinds of numbers though.
And the other thing to keep in mind is that a racecar is a full system. The engine is a very important part of it, but the suspension and dynamics are just as important if not more so to some degree. One of the recent Cleetus videos kind of pointed that out in how their 2500 hp car couldn't hook worth anything to make it down the track while their 5000 hp could stick like glue and make a full pass. Steve Morris had another video like that talking about traction control. You could have two cars run down the track and run the same ET, but one is blowing parts up left and right because the traction control is pulling timing and it's bouncing back and forth all over the place while the other car just runs steady the whole way. You have to build it all to work together. Incredible work regardless to see these cars put up those kinds of numbers though.
Not that I have had any blazing fast cars but I have always (since the 80s) built my cars in FAST fashion .
My 408 W2 Swinger might hit the 10’s but it has headers and a Victor intake .
I think the key to hooking with bias ply's is weight transfer , loose front suspension, semi loose rear , cam timing , ignition curve and tire mods…. I am sure there are other tricks but these are the basics .
My 408 W2 Swinger might hit the 10’s but it has headers and a Victor intake .
I think the key to hooking with bias ply's is weight transfer , loose front suspension, semi loose rear , cam timing , ignition curve and tire mods…. I am sure there are other tricks but these are the basics .
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