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#1
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340 sb chrysler
hey i have a 1972 dodge challenger and with a 340 bored 0.40 over with cast pistons, aluminum edelbrock rpm heads, rpm air-gap intake,650 Speed Demon Carb, adjustible rockers off of a 273 ,Mopar performance cam 484/484 lift stock windage tray and stock rods. It has a rebuilt 904 transmission with a shift kit and a 2,800 stall converter with 3:55 posi with 10 inch wide MT e.t street/strip slicks. I havent took it to the track yet but id like to see what you guys think it will run in the quarter mile?
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#2
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13.6 seconds
Recommendations: Headers, 2.5 inch exhasut with X-pipe, 3.91 rear gears, 3500 stall, synthetic engine oil, tranny fluid, and rear end fluid, skinny front tires, lightweight wheels, Wilwood front discs for a weight loss of 20lbs per front wheel. Shed some weight with fiberglass hood, battery in trunk, remove other seats. A well ventilated engine compartment will also get you .2 seconds, front spoiler. But, as it stands now, still a GREAT CAR!!! |
#3
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If the exhaust is Stock, I would also say that 13.6 is pretty realistic. Of course depends also of the compression ratio, if you have low compression '72 psitons there, 13.6 would be a good number. If it's high CR, and you have the headers and free flowing piepes too, I might even believe in 12 sec ET's. You have decent converter and should have enough traction with those tires.
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#4
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it does have tti headers with a 2.5 inch dynomax exhaust, and about have 10:5:1 compression
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#5
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I have the same combo except 0.020 over, with 6 pack and T/A heads.
12.79/103 |
#6
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Quote:
Sounds like a great car!! |
#7
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With everything sorted out well it could be even quicker than high 12's. Steeper gears and perhaps 1000 rpm more stall would really make a difference.
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#8
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DartGT66
Yes, I've been tempted to try a bit more tuning, 4.88's and a 8"-9" converter myself. But that would ruin my 19 mpg. lol. Would probably go very low 12's. |
#9
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4.88 is too much gear unless you have a pretty tall tire to go with it. That cam will be done by 6000.
With your set up I will say mid 13's at best on a good day with good track conditions and traction and reall good tune up, and closer to a 14 second average. |
#10
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DJM
4.88:1 and a 29" tall tire gives exactly 6000 rpm in the traps. It is perfect for the Mopar 284/484 cam rated at 6000 rpm max output. But of course this is at sea level. I'm sure my Cuda would handle it well, but like I said, I like my gas mileage. OOPS 6800 rpm crank turning |
#11
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Quote:
I run a 4.30 gear with a 29.5 X 10.5 slick and am right at 59/6000 depending on the day. My shift light is at 6 and it is just flickering most of the time at the traps. What ever turns your crank but I maintain that 4.88 is too deep for that combo. |
#12
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xxxxxxxxxx
DJM What part of 12.79/103, did you misunderstand. Done with 3.55:1 gears! Oh, and BTW the Mopar 284/484 pulls well up to 6500 rpm on the dyno. And while it levels out there, it does not fall off. |
#13
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Going by this part, "4.88:1 and a 29" tall tire gives exactly 6000 rpm in the traps. It is perfect for the Mopar 284/484 cam rated at 6000 rpm max output"
Ain't no way that you will a 4.88 through the quarter with a 29 inch tire and only pull 6000. And in all the years around this game I have yeat to see an engine with that cam truly pull at 6500 in the real world and not et better by shifting sooner. Like I said what ever turns your crank. I didn't misunderstand any of that, "What part of 12.79/103,". . |
#14
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DJM
What part of pulled to 6500 on the dyno did you misunderstand? Did someone say shifted at 6500 rpm? I must of missed that part. And if you go check my oops "6800 rpm" regarding 4.88's and 29" tire., you are already too late. And if you haven't seen it, is that gospl.lol. Then you need a more presicely built and tuned engine maybe. I most certainly have the exception though. And this while still mixing a/f at 13.0 :1 and higher (numericallly) |
#15
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What is your problem fella???
I said 6500 because that is what I meant to say because I have yet to see one with that cam even make it that far and still be pulling to it's potential. And even more so if in this case it sounds as if the engine is running with stock type low compression pistons. No matter what the dyno says, the real world is the true test. Do what you want. But over the years I have seen very few people that have been truly happy with that cam. At least ones that have anything else to compare it too. If you like it is your engine, it is your car, run it and be happy. Happy Thanksgiving. |
#16
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DJM
Say what you mean the first time instead of using ignorance and ridicule on a subject you have no first hand knowledge of. lmao! |
#17
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i have a 73 challanger im putting the 413 wedge it has ben punched 40 over i am running 391 gears what is a good set up for it i want to run 11s on pump gas and drive it from time to time on the street it has a steel crank flat top pisting no valve releace i have a 488/558 lift cam to go in it if it will work looking to put a 3000 stall any info would be nice ty
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#18
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Will the 650cfm pull to 6000 in a good 340? My 318 pulles ok to 6500 in first but was flat at 6000 in second and 5000 was about it for third.... The 950 Projection took care of all that and even drives/starts better than the 650 too
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#19
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Like you found out the 650 will have very good low end but tend to fall flat on top with the higher RPM and load conditions. I would go with a good 750. But that is me.
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#20
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Quote:
have clue what yor problem is other than someone doesn't nessesarly agree with you and what I have done and stated WORKS. If what works for you fine and good - do it. In the mean time back off all you are doing is showing that you can't take it if some one that doesn't share your opinion. In the mean time go on someones shoulder that may give a rat's a$$ because I really don't care what you think. If you don't like it ignore it. You are getting a little old. Go have another Course I am really new to this game and only been in it for close to 45 years and into street, dirt track, pullers and drag. So I really am a novice here. |
#21
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I was happy with my 650 Demon on a 340. 12.02 in the heat at 4900 ft. altitude. I had a pair of Mullen heads and 12.5:1 (advertised) compression. It pulled to 6000 easy and never seemed to flatten out. Felt like it had more in it but that was my first race in my drag car I was happy with the set up, but this was/is my only experience with that motor as it gave up shortly after. I think it was a 242/250 Comp cam with 557" lift?
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#22
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They always seem to run best before they go!
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#23
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Is'nt that the truth! The heads turned out to be Rain Birds (tm) ha,ha! So I got a good pair of w2s (thanks Bob!) but I really do miss the Mullens. Wish I could've seen their full potential.
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