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Street Race a Stock 70 340 Duster vs 71 340 Duster #1610687 04/22/14 07:19 PM 04/22/14 07:19 PM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom OP master
scatpacktom OP master S Joined: Jan 2003 Posts: 3,103 Phila Pa	Both cars are equally shifted and geared, have about the same options and weigh within pounds of each other. Which car is faster and why?

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: scatpacktom] #1610688 04/22/14 07:41 PM 04/22/14 07:41 PM
Joined: Feb 2003 Posts: 8,020 Pangaea B5 Bee master
B5 Bee master Joined: Feb 2003 Posts: 8,020 Pangaea	Thermoquad puts the '71 first to the finish line.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: B5 Bee] #1610689 04/22/14 07:55 PM 04/22/14 07:55 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	71, TQ AND Intake design.......But thats only if everyting is truely stock. Toss on a stealthy 800 cfm AVS, port the intake, etc. and the 70 might come out on top, of course the TQ car could then up the ante with a bigger TQ and ported intake as well. BTW, if anyone thinks the pass side exhaust manifold difference would give an edge to the sexier 70 design, I've dyno tested both, 1-2 hp difference, so basically nothing.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610690 04/22/14 08:34 PM 04/22/14 08:34 PM
Joined: Mar 2006 Posts: 9,835 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,835 MI, usa	Assuming proper tuning the 71 has a bigger and technologically superior carb and matching bore manifold. I believe those are the only differences. 71 wins. Doug

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: dvw] #1610691 04/22/14 11:29 PM 04/22/14 11:29 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	71, too bad no 6 pack option back then oh well..

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: scatpacktom] #1610692 04/23/14 12:19 AM 04/23/14 12:19 AM
Joined: Sep 2003 Posts: 2,763 Myrtle Beach, SC formerly the ... 340wedge master
340wedge master Joined: Sep 2003 Posts: 2,763 Myrtle Beach, SC formerly the ...	1971 wins, better stripes and sharktooth grill add 10HP 1971 Sassy Grass Green Duster 340 2006 Charger Daytona GoMango

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ademon] #1610693 04/23/14 12:19 AM 04/23/14 12:19 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Quote: 71, too bad no 6 pack option back then oh well.. Well there was......Sort of *BTW, I got the chance to drive the car in this article, it was the tightest nicest Demon I ever drove and it was very fast for a stock 340 Six Pack. 8121464-MrNorms.jpg (203 downloads)

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610694 04/23/14 12:21 AM 04/23/14 12:21 AM
Joined: Jan 2003 Posts: 15,350 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,350 Omaha Ne	Quote: 71, TQ AND Intake design.......But thats only if everyting is truely stock. Toss on a stealthy 800 cfm AVS, port the intake, etc. and the 70 might come out on top, of course the TQ car could then up the ante with a bigger TQ and ported intake as well. BTW, if anyone thinks the pass side exhaust manifold difference would give an edge to the sexier 70 design, I've dyno tested both, 1-2 hp difference, so basically nothing. I agree and was there in the day, Scott nailed it www.tandmautomotive-omaha.com

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ademon] #1610695 04/23/14 12:27 AM 04/23/14 12:27 AM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom OP master
scatpacktom OP master S Joined: Jan 2003 Posts: 3,103 Phila Pa	"BTW, if anyone thinks the pass side exhaust manifold difference would give an edge to the sexier 70 design, I've dyno tested both, 1-2 hp difference, so basically nothing." I wouldn't have guessed that. The outlet is like 2.5 vs 1 7/8 plus the pipe diameter has the be smaller as well. OK so we think 71 is king, how much better do we think a TQ is over a AVS? Take my Duster that has run a best of 13.20 how much faster is it if I were to swap out the intake and carb? A tenth? Two? If it is 5 to 10 hp it won't even show up on the strip. Last edited by scatpacktom; 04/23/14 12:29 AM.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: scatpacktom] #1610696 04/23/14 12:33 AM 04/23/14 12:33 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Tom, only one way to find out for sure In a real world test on the same car/engine I'd guess you wouldn't see a huge difference but on paper the 71 should be the winner (by whatever margin). It may come down to the individuals skills in carb tuning as well, AVS's are pretty basic/easy to tune, TQ's are a bit more complicated and need to be tuned properly to work at their peak, something that can take a bit of practice.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610697 04/23/14 12:44 AM 04/23/14 12:44 AM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom OP master
scatpacktom OP master S Joined: Jan 2003 Posts: 3,103 Phila Pa	I know Scott

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: scatpacktom] #1610698 04/23/14 12:58 AM 04/23/14 12:58 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	I know you know, so go do it man!

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610699 04/23/14 01:11 AM 04/23/14 01:11 AM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom OP master
scatpacktom OP master S Joined: Jan 2003 Posts: 3,103 Phila Pa	I had read that the hot lick back in the day was to put a 440 carb on a 340. I stuck a 69 440 carb on the Duster and took it for a spin. I didn't run it at the track but it seemed to do nothing. I put the correct carb right back on. I may have to revisit that test at the track. I remember I had to stack a couple of thick gaskets up so the throttle blades would clear the intake. I know in Stock Eliminator the 71 car is clearly better than the 70. In stock form I'm just not sure. Doesn't seem to me a stock engine can use the TQ to its fullest potential. I keep thinking my car is second fiddle to a 71 but I'm just not really sure it is.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: scatpacktom] #1610700 04/23/14 01:33 AM 04/23/14 01:33 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Quote: I keep thinking my car is second fiddle to a 71 but I'm just not really sure it is. When two cars are so closely matched it's really hard to prove either as superior. Running factory tires (i.e. traction issues) would probably make it even harder.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610701 04/23/14 01:50 AM 04/23/14 01:50 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	I would say the intake is the bigger plus more than the carb on the 71's. I really don't think you would see much difference on the time slip. The 71 aircleaner slowed my car down 2 tenths but my sb is more like 400hp.

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610702 04/23/14 03:34 AM 04/23/14 03:34 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Quote: Quote: 71, too bad no 6 pack option back then oh well.. Well there was......Sort of *BTW, I got the chance to drive the car in this article, it was the tightest nicest Demon I ever drove and it was very fast for a stock 340 Six Pack. Couple weeks away myself 8121591-6pack023(1280x960).jpg (369 downloads)

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ademon] #1610703 04/23/14 06:13 AM 04/23/14 06:13 AM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power master
bigblock340power master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	Hummmmmm, what should I pick? 70-71? 70-71? Ok, I'll go with the '71

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: bigblock340power] #1610704 04/23/14 03:54 PM 04/23/14 03:54 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	I remember watching the 1971 NHRA Winternationals stock qualifying in the classes the 340 ran in, the 1971 where quiet a bit faster than the 1970 cars in the same classes I didn't know at that time that the 1971 340 had different carbs than the 1970s did NHRA put the 1971 cars in the higher classes, weight per HP rules, later that year I beleive Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: ScottSmith_Harms] #1610705 04/23/14 10:44 PM 04/23/14 10:44 PM
Joined: Jan 2003 Posts: 3,009 Covington Georgia RV2 master
RV2 master Joined: Jan 2003 Posts: 3,009 Covington Georgia	Was there a compression ratio difference between 70&71?

Re: Street Race a Stock 70 340 Duster vs 71 340 Duster [Re: RV2] #1610706 04/23/14 10:55 PM 04/23/14 10:55 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I think some books state the 71's at 10.0 and the 70's at 10.5 comp ? I also dont remember if it was 71 or 72 when they started putting EGR jets in the bottom of the intake manifold ? Ron Last edited by 383man; 04/23/14 10:56 PM.

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