What will it run 410 stroker 71 Duster.
#3054542
06/29/22 11:57 PM
06/29/22 11:57 PM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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I have a 71 Duster,full interior, steel hood, 73^ disc brake swap. 410 stroker 360, CAST Scat crank, made 467hp and 506 ft lbs on the dyno pulling it to 6k ,727 forward manual VB, 3000ish stall 10in b&m holeshot conv. 4.30 gear, 275/60/15 Et street pro (28ish in. tire)I’m slightly worried about trap rpm and how tight I can safely twist the cast crank, what is a safe max rpm for this crank, and what does everyone think it should run?
Last edited by moparjoe360.4; 06/30/22 09:06 AM.
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Re: What will it run 410 stroker 71 Duster.
[Re: topside]
#3054569
06/30/22 04:53 AM
06/30/22 04:53 AM
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Joined: Oct 2015
Posts: 570 UK
rb446
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Yep 6>6500rpm with slip although I doubt you'll get too much with that converter. At a guessing weight of 3400lbs@the line and an honest 450fwhp/28" tyre your ticket could look like this if it hooks good>
60 Foot E.T. : 1.59 Seconds 1/8 Mile E.T. : 7.21 Seconds 1/8 Mile Trap Speed :94.25MPH 1/4 Mile E.T. : 11.43Seconds 1/4 Mile Trap Speed :117MPH 1/4 Mile Trap RPM :6054RPM+slip and with 4.10's 5772+
We got a street/strip Demon here with a mild 340/416 running 11.2's/118+ with similar hp, .500" hyd. cam, stock J heads, TR with 2 x 650DP's, Hughes 3500stall, SS springs, 3.91's/10x28's at approx 3250lbs, shifts@5500 traps@6000-ish.
Last edited by rb446; 06/30/22 05:09 AM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: What will it run 410 stroker 71 Duster.
[Re: topside]
#3054592
06/30/22 08:41 AM
06/30/22 08:41 AM
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Posts: 394 Ohio
moparjoe360.4
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At 6000, was it still making power, or had it leveled off ? With decent valve springs I wouldn't worry about 6500 RPM, but that might not be necessary. It was starting to level off at 6k but I think it might’ve had a couple more hp left in it. Judging from driving it around this thing twists up very quick, I’m going to guess it will trap between 6200 & 6500 from the messing around I’ve done on the street, but I currently have my rev limiter set at 6k so I’m not sure. The first couple times at the track I plan to leave the exhaust on it so I know it won’t be max effort. I’ll let everyone know what it does once I get it to the track.
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Re: What will it run 410 stroker 71 Duster.
[Re: Locomotion]
#3054593
06/30/22 08:44 AM
06/30/22 08:44 AM
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moparjoe360.4
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FWIW, Scat and eagle are cast steel. Certainly stronger than cast iron,but OEM 360 cranks are pretty strong already. Mine have been stock stroke, but I've run cast steel cranks to 7,000 for years. Strokers shouldn't need that much even if they can handle it. That’s good to know. Thanks. I’m probably worrying about the rpm more then I should be, I just don’t want to hurt it after putting the last 4-5 years of my free time into getting this car together.
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Re: What will it run 410 stroker 71 Duster.
[Re: moparjoe360.4]
#3054594
06/30/22 08:46 AM
06/30/22 08:46 AM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
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467 hp on a chassis dyno? If so, I'd expect it to run in the 10s.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: What will it run 410 stroker 71 Duster.
[Re: rb446]
#3054595
06/30/22 08:48 AM
06/30/22 08:48 AM
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Joined: Feb 2012
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moparjoe360.4
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Yep 6>6500rpm with slip although I doubt you'll get too much with that converter. At a guessing weight of 3400lbs@the line and an honest 450fwhp/28" tyre your ticket could look like this if it hooks good>
60 Foot E.T. : 1.59 Seconds 1/8 Mile E.T. : 7.21 Seconds 1/8 Mile Trap Speed :94.25MPH 1/4 Mile E.T. : 11.43Seconds 1/4 Mile Trap Speed :117MPH 1/4 Mile Trap RPM :6054RPM+slip and with 4.10's 5772+
We got a street/strip Demon here with a mild 340/416 running 11.2's/118+ with similar hp, .500" hyd. cam, stock J heads, TR with 2 x 650DP's, Hughes 3500stall, SS springs, 3.91's/10x28's at approx 3250lbs, shifts@5500 traps@6000-ish. I’d be very pleased to see a slip that looks like that! Honestly I was figuring 12.10s-11.80s
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Re: What will it run 410 stroker 71 Duster.
[Re: an8sec70cuda]
#3054596
06/30/22 08:56 AM
06/30/22 08:56 AM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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467 hp on a chassis dyno? If so, I'd expect it to run in the 10s. It was an engine dyno, I wish it was wheel hp.
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Re: What will it run 410 stroker 71 Duster.
[Re: moparjoe360.4]
#3054602
06/30/22 09:33 AM
06/30/22 09:33 AM
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Joined: Jan 2003
Posts: 11,728 Portage,michigan
B3422W5
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Should run mid 11’s easy enough. Would run better with a good convertor.
Last edited by B3422W5; 06/30/22 09:34 AM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: What will it run 410 stroker 71 Duster.
[Re: moparjoe360.4]
#3054603
06/30/22 09:34 AM
06/30/22 09:34 AM
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Joined: Mar 2005
Posts: 1,559 Michigan
Kiddart
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pro stock
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I would think 11.3 to 11.6 all day pending track condition and the how it hooks
Thank you Kiddart
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Re: What will it run 410 stroker 71 Duster.
[Re: moparjoe360.4]
#3054656
06/30/22 12:29 PM
06/30/22 12:29 PM
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Joined: Aug 2003
Posts: 43,308 Bend,OR USA
Cab_Burge
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Using the peak HP or peak torque RPM may not be what your motor wants to be shifted at, I learned that on my last pump gas stroker BB motor. It had several different sets of heads on it with a low deck six pack set up, I engine dyno tested it multiple times on three different engine dyno, it always made peak HP between 5500 and 5600 RPM, peak torque between 4500 and 4600 RPM. At the track it wanted to be shifted at or above 7000 RPM That stupid motor was an over achiever from day one, I learned a lot from it My message is go test different shift points, maybe start at shifting it at 5500 RPM, then 6000 RPM and then 6500 RPM as long as it is going quicker and faster move the shift point up until it doesn't go quicker or faster by 500 RPM increases, once it stops gaining try splitting the shift rpm by 200 to 300 RPM above and below where it went the best for you. Not all tachs read the same RPM as all other tachs also Good luck, have fun and test, test and test some more
Last edited by Cab_Burge; 06/30/22 12:30 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What will it run 410 stroker 71 Duster.
[Re: moparjoe360.4]
#3058553
07/12/22 12:04 PM
07/12/22 12:04 PM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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Well I finally made it to the track for the cars first Test n Tune last Saturday, I was happy with the results considering it was in street trim with the exhaust still on it and bouncing it off the rev limiter on shifts. I still have a lot of learning to do and there are a few minor tweaks that need to be made. These are the time slips from the first 2 passes.
Last edited by moparjoe360.4; 07/12/22 12:06 PM.
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Re: What will it run 410 stroker 71 Duster.
[Re: moparjoe360.4]
#3058557
07/12/22 12:21 PM
07/12/22 12:21 PM
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Joined: Oct 2004
Posts: 2,843 Connecticut
FurryStump
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Is it spinning? 60’ is soft. 4:10 might help a bunch. Mine is a low gearset 904, but I run a 26” tire with 4:10’s, with a 9.5” ptc converter that slips 3-4% at the stripe. If flashes to 3500 rpm. Crosses at 6500-6700 rpm using the same crank. I have 1000’s of runs on it and dragweek and 60,000 street miles. It has been balanced to 1/2 a gram by a real old, very picky guy. Oh, with that hp in a sorted out combo you with be in roll bar territory. Low 11’s
Last edited by FurryStump; 07/12/22 12:23 PM.
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