Ron Jr wants to go faster.

3

383man

Well-known member
Yes Ron Jr will be buying 4.30 gears real soon for his Dart. We have a brand new set of MT 28 x 9 slicks we will use also. Then my buddy will let us use his new 850 DP and he plans to buy a TM6 or Holley Street dominator also. We feel the short stroke 400 will like the changes as we plan to do them before going back to the track. Ron
 
Wont be as streetable and you should start thinking about a roll bar but heck yes those mods will get you in the 10s I would think. [smilie=e:
 
Actually the rollbar will go in next. I feel much better with a rollbar in the car with my son driving it. Yes the 28" slicks do fit as we actually tried them last year with the 383 and the 3.91's. It ran 12.57 but they were a little to tall and the 383 did not pull them well down low as it ran 12.43 the same day with the 26" McCreary's. Course we had the 3.91's with the TA 10" 3000 convertor and now its the 4200 9.5 Dynamic convertor in it. It uses 26" street tires and 3.91's now so we will be using a 28" street tire when we go to the 4.30's and yes it is still a very streetable car. We will still drive it 45 miles at 60 mph to the track and 45 miles home. We plan to go after a 10 second pass in the next 2 years without and major changes as I feel the eng can do it and we also will not cut on this car. So we will be doing it on 28 x 9 slicks. It will be fun as I also hope to get my 63 in the mid 11's late this year. Looks like I will be busy but having fun. [smilie=e: Ron
 
Ron, what does the Dart have for rear suspension?
Also are the wheel spacings diffrent on a 1970 & 1972.

I think I can only fit a 9.5" section under mine which gives me
8" tread.
 
Tony we put the 02 and 03 S/S springs on the Dart last Oct. Thats it as the rest of the suspension is stock. We did trim the inner wheel lip so the MT 28 x 9 slicks would clear and its real close going thru the traps in the front of the rear wheelwell as it almost rubs when the slick grows. As far as I know the 70 - 72 Dart wheelwells are all the same. We are usung a 7" old cop wheel with a 4-1/2 backspace. Ron
 
Here is a pic I took when we had the slicks on it that day. Ron

93042590.jpg
 
Actually Ron its been 5 days since we took the new combo to the track. LoL ! Yea I guess he has that gearhead blood in him like us. Its funny as my friend races his 68 Cuda in Super Street on the 10.90 index and he is going to Maplegrove in PA this weekend. Well today at work Ron Jr says he really dont like that kind of racing because he wants to run his car flat out everytime he runs it and would not like slowing it down to dail for an index. I had to laugh to myself because I am the same way.......always looking for a new best et. [smilie=b: Ron
 
383man said:
Actually Ron its been 5 days since we took the new combo to the track. LoL ! Yea I guess he has that gearhead blood in him like us. Its funny as my friend races his 68 Cuda in Super Street on the 10.90 index and he is going to Maplegrove in PA this weekend. Well today at work Ron Jr says he really dont like that kind of racing because he wants to run his car flat out everytime he runs it and would not like slowing it down to dail for an index. I had to laugh to myself because I am the same way.......always looking for a new best et. [smilie=b: Ron[/quote]

I guess i'm just like you guys then, lol. I could care less what it runs as long as i beat the guy in the next lane !!! I suppose i'm just a heads up racer type.....if i was bracket racing i'd want to be lined up with someone who's dialed the same #. Great minds think alike [smilie=e:

Ron


Ps. I see that combo liking more gear and a single plane...that 557 should make power to 6500 easy with 400 cubes. The 4.30/28in tire combo should work nicely with the rest of the package, inmo. Fwiw, mine didn't like the RPM dual plane....it fell off after 5500 rpm on the dyno and was down 20-30hp at peak. About the only thing it did better was tq below 3200rpm but with a 9.5in converter @4200 stall....it's not really an issue.
Click to expand...
 
Thanks Ron. Yes great minds must think alike. LoL. [smilie=b: I also feel the dual plane Performer RPM may hurt it with the 4.30's. Its a nice street/strip intake for sure but I agree that it should make power up to 6500 easy and I feel the Performer RPM starts falling off about 6000 rpm. My brother ran this same shortblock in his 3100 lb Duster with 5.13's and 29.5" tires. He shifted it at 7000 and ran a best of 10.95 @ 123. We had just planned for a nice mid 11 combo with the 3.91's and dual plane but now that we decided to go for what we can but keep it a street car I think you are right. So I can get my hands on a very new Holley 850 DP and want to try either a Holley Street Dominator or TM6 with it. Which do you like better of the 2 intakes ? I figure we will push 6500 shifts with the 4.30's and see how it likes it. But I do have to put a tach in the car so we can get serious with our shift points. [smilie=e: Ron
 
very nice combo Ron!!

i got a old 383 in mopey with a nice cam and a street dominator, it pulls very hard but at 6000 rpm's it suddenly stops cause it's floating the valves.
But it want to go higher that's for sure, i like this intake!

today i can pick up my block at the machineshop so in a few weeks the 39 year old 383 can come out and the 450ci stroker can go in! [smilie=b:
 
383duster said:
today i can pick up my block at the machineshop so in a few weeks the 39 year old 383 can come out and the 450ci stroker can go in! [smilie=b:[/quote] Cool Martijn What are ya gonna do with the 383? [smilie=e:

Dave
Click to expand...
 
74spaceduster360 said:
383duster said:
today i can pick up my block at the machineshop so in a few weeks the 39 year old 383 can come out and the 450ci stroker can go in! [smilie=b:[/quote] Cool Martijn What are ya gonna do with the 383? [smilie=e:

Dave[/quote]

I can put the proper valve springs on it and then blow up the engine [smilie=a:

and i can rebuild the engine and sell it, think that;s the best choise so i won't damage my inner fenders with broken rods [smilie=e:
Click to expand...
Click to expand...
 
so.........ya feel the need for speed. Jr's got bit bad by that bug, $. you guys are going to have a blast

greg
 
383man said:
So I can get my hands on a very new Holley 850 DP and want to try either a Holley Street Dominator or TM6 with it. Which do you like better of the 2 intakes ? I figure we will push 6500 shifts with the 4.30's and see how it likes it. But I do have to put a tach in the car so we can get serious with our shift points. [smilie=e: Ron[/quote]

I think it's a toss up between the two. Both the SD and tm7 were very close in terms of hp and tq on the 446. Dwayne said that the SD felt a little better in terms of throttle response on the dyno, fwiw.

You've got 2in tubes on this motor so it wants to rpm and the headers sure won't be holding it back. I'm thinking that the rpm manifold just doesn't move enough air for a 280cfm head and that's where the single planes will shine. An open spacer also gives you more plenum volume if needed. You might want to look at a rev limiter as well....just to be safe. Those solid cams sure are a lot of fun huh !!!

Ron
Click to expand...
 
Thanks for the info Ron. Do you have or know what month Mopar Muscle the BB intake dyno tests were in ? I know I have it and wanted to see it again but cant remember what year and month it was. My buddy has a Lowblock Holley Street Dominator and if I can get him to swap intakes we will try it with the 850 DP. [smilie=e: Ron
 
Ron, the article was called "Intake Extravaganza" and appeared in a couple of issues a while back...probably 2-3 yrs ago for the original and the re-print was last year i believe.

The reprint appeared in the MM tech issue with all the head porting info....that was an awesome edition with lots of excellent info from Steve Dulcich. The cover was lime green and it was a special news stand only issue. I have it somewhere as well as the original publication it was printed in. If you can't find it, let me know and i can scan and e-mail it to you.

Ron

Ps. That article was comparing RB intake manifolds but i think they also did a similar low deck comparison as well....that one might be burried somewhere in the archives....i seem to remember reading it at some point.
 
You must log in or register to reply here.

SiteLock

SiteLock
Back
Top