Page 1 of 3 1 2 3 >
Topic Options
#2484028 - 04/17/18 01:15 AM Quarter Mile time for 1971 440+6 Roadrunner
markshemiworld Offline
member

Registered: 04/02/10
Posts: 63
Loc: Oak Forest, Texas
I’m seeking some opinions on what y’all think a 1971 Roadrunner with these options would run in a quarter mile:

440 six pack
Bored 30 over
10.5 to 1 compression
Aluminum H Beam Rods
Forged Crank
Forged Pistons
Stock 906 heads with 3 angle valve job
Comp Cams Extreme Energy XE262H
Stock Holley Carbs with larger jets
Factory Electronic Ignition
Stock Manifolds
2.5” exhaust with Flowmaster 40 Series
TCI Streetfighter 727 with 2400 stall converter
8 3/4 with 4.10 rear gears
275/65/15 BF Goodrich Radial T/A’s on the back with Rallye Wheels

Car has power steering and power brakes and a Sanden A/C compressor. Car also has stock airgrabber hood with K&N air filter. Thanks ahead of time for your answers!

Top
#2484032 - 04/17/18 01:28 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
J. Hammer Offline
member

Registered: 04/25/16
Posts: 136
Loc: Memphis,TN
16.5 @ 75mph? Depends on who built and tuned it. Radial T/A s are spin city on a minivan. Post up some 12's and I will be impressed.


Edited by J. Hammer (04/17/18 01:30 AM)

Top
#2484039 - 04/17/18 01:57 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
qwkmopardan Offline
super stock

Registered: 03/26/08
Posts: 851
Loc: Affton MO
Eagle H-beam rods are 4340 chrome moly steel. i saw the posts on Questions and answers and you stated they are eagle rods. Tuned right it should run low 13s.

Top
#2484045 - 04/17/18 03:20 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
EV2Bird Offline
No more politics

Registered: 06/23/14
Posts: 3851
Loc: Kansas Roads Between 0 and 140...
Hotrod mag could only get a 15.1 out of a new 71 auto 440-6 bee and you have a mild cam, a vj and a bit of a vert on them.

Your tires if the newer BFG suck and if they are older they are aged and either way a good 340 wouldnt hook well.

Id be shocked to see quicker then a 13.9 as it is, but good luck.

Top
#2484048 - 04/17/18 04:03 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
slantzilla Offline
I Live Here

Registered: 01/24/03
Posts: 18104
Loc: Park Forest, IL
IIRC, Car Craft got one into the 12's with similarly equipped as yours. They were testing a 6 bbl RR against an LS-5 Chevelle. The RR was faster stock than tbe Chevelle was with headers and gears. They called the RR 'Superman's Supercar'.
_________________________
"Everybody funny, now you funny too."

Top
#2484087 - 04/17/18 08:19 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: qwkmopardan]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10672
Loc: Marion, South Carolina [><]
iagree Low 13s or high 12s w/ different tires that will hook and considering it's tuned well.
_________________________
CHIP
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 446" w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'01 Ram 2500 QCSB 4x4 Cummins...toy hauler
'16 Grand Caravan SXT...baby hauler

Top
#2484089 - 04/17/18 08:24 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
RATTRAP Offline
pro stock

Registered: 03/28/05
Posts: 1391
Loc: N/E, Michigan
low 14 high 13 IMO

Top
#2484120 - 04/17/18 09:21 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
rb446 Offline
enthusiast

Registered: 10/17/15
Posts: 233
Loc: UK
My 440+6pk motor made 415 track hp with a single 850DP, stock 906's and a big solid cam, hdrs. If yours is on a par with that corked up and with a good tune, with a weight of 3800 at the line it should run 108>109mph which is normally a lowish 12. However with those tyres you'll prob lose over 1 sec off the hit, I would say mid>high 13's. Some 29" tall slicks would be the way to go for a 5500 trap rpm inc. slip and 12.2's@110.
_________________________
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987

Top
#2484153 - 04/17/18 10:20 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 10900
Loc: So. Burlington, Vt.
Ralph from Supercar has one he runs in Pure Stock with a 4 speed.
Best so far is 13.6@101.

I'll be interested to hear your impressions of that cam in the upper rpm's.

Hopefully you used quench dome pistons to get to that 10.5cr........ Otherwise I predict ping city with that short duration cam.

My shoot from the hip guesstimate, based on the small fast rate cam, non-sticky tires, and potential Texas heat and humidity......... Mid/high 14's @92-95(first couple times out with it).
With some tuning, practice, and better tires........... 13.7@99.
_________________________
68 Plymouth Satellite, 383, stock 906's, 3550lbs, 11.18 @ 123, 1.51 60'
WD- Comp Cams / Indy Cylinder Heads

Top
#2484171 - 04/17/18 10:47 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
markshemiworld Offline
member

Registered: 04/02/10
Posts: 63
Loc: Oak Forest, Texas
Thanks for all the responses! What is a good tire that will hook better and still be ok for the street? Also, do you guys see anything lacking that would be an easy way to step up he performance?

Top
#2484178 - 04/17/18 10:54 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
pittsburghracer Online   work
Slowride

Registered: 02/02/05
Posts: 12974
Loc: PA.
Originally Posted By markshemiworld
Thanks for all the responses! What is a good tire that will hook better and still be ok for the street? Also, do you guys see anything lacking that would be an easy way to step up he performance?




Better tires, higher stall converter, headers, ported heads or aluminum heads.
_________________________
1970 Duster
Edelbrock headed 408
6.143@110.89 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
6.001@113.27mph
9.44@138.23

Untitled by John Cadamore, on Flickr





Top
#2484179 - 04/17/18 10:55 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
EV2Bird Offline
No more politics

Registered: 06/23/14
Posts: 3851
Loc: Kansas Roads Between 0 and 140...
Your in the mud now, you got to run with the BFG-s first smile

Then switch to a decent 275/60 drag radial.

Since you have a auto and BFG drag radial would probably work well and act like a street tire, yes there are better hooking drag radials but I dont think youd need one thats more slick like then street like, if that makes any sense.

But yea, it would be nice to see ya try your current BFG tires just to see how well ya can do.

Top
#2484187 - 04/17/18 11:02 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 10900
Loc: So. Burlington, Vt.
You have to start somewhere.

Might as well just try it like it is to see where you're at.
That will give you way more useful info that what any of us come up with before the car has been run.
_________________________
68 Plymouth Satellite, 383, stock 906's, 3550lbs, 11.18 @ 123, 1.51 60'
WD- Comp Cams / Indy Cylinder Heads

Top
#2484206 - 04/17/18 11:32 AM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
dvw Online   content
master

Registered: 03/16/06
Posts: 7002
Loc: MI, usa
With Radial T/A's our Challenger has run from 15.20 with my wife driving (she got better down to 14.20s). To my all time best of 13.20. With drag radials, 12.70's, with slicks and a 4.30 12.50. All with exact same tune.
Doug

Top
#2484230 - 04/17/18 12:38 PM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
DaytonaTurbo Offline


Registered: 02/26/03
Posts: 20828
Loc: Manitoba, Canada
I don't think you'll get out of the 14's as-is. Stock heads with stock valves with a valve job and a very small cam. Should make for a good street cruiser. With good tires and a well sorted suspension I would expect mid-low 13's.

Top
#2484231 - 04/17/18 12:42 PM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41944
Loc: Spokane Washington
Aluminum rods?

Top
#2484289 - 04/17/18 03:14 PM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
Silver70 Offline
I Live Here

Registered: 02/01/03
Posts: 18085
Loc: Rust Belt, SW PA
As is, I'd guess mid 14s.
_________________________
68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
99 Trans Am, 66 GTO, 06 Magnum RT AWD

Top
#2484297 - 04/17/18 03:34 PM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
csk Offline
super stock

Registered: 08/13/11
Posts: 1060
Loc: KATY TEXAS
15.20

Top
#2484395 - 04/17/18 07:59 PM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: DaytonaTurbo]
Spaceman Spiff Online   penguin-006
master

Registered: 11/28/10
Posts: 3189
Loc: jersey
Originally Posted By DaytonaTurbo
I don't think you'll get out of the 14's as-is. Stock heads with stock valves with a valve job and a very small cam. Should make for a good street cruiser. With good tires and a well sorted suspension I would expect mid-low 13's.


'58 savoy, 3900lbs

'70 440 from a town and country wagon.
ball honed, new rings, bearings, and rod bolts.
stock pistons, rods, crank. ( crank need to be polished)
Lunati bracket master cam, with springs to match, ductile iron rockers.
stock heads, that were magnafluxed and just cleaned up, new seats, etc. no port work. sanderson block hugger headers, 3 inch exhaust with race magnums.
torker 2 intake, 850 double pumper.
3,000 stall, 4.56 gears.
12.24@ 111 on a set of L-60 McCrearys.
_________________________
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!

Top
#2484398 - 04/17/18 08:06 PM Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld]
markshemiworld Offline
member

Registered: 04/02/10
Posts: 63
Loc: Oak Forest, Texas
Car has never been to the track. Forgot to add that it has the Mopar Performance larger torsion bars and Super Stock Springs. Has a 3.23 gear in it now, was planning on swapping the 4.10 in soon. Would that make a difference in maybe helping with the wheel spin?

Top
Page 1 of 3 1 2 3 >

Advertisement
Forum Stats
25,386 Registered Members
32 Forums
191,065 Topics
2,228,801 Posts

Most users ever online: 1,424 @ 06/20/18 07:18 PM
Moparts Newest Topics
05 CTD auto trans fluid capacity?
by 70satelliteguy
07/23/18 11:04 AM
mopar muscle
by btomasko
07/23/18 10:36 AM
Mopars at Woodburn 7-22?
by toyotajeep
07/23/18 10:16 AM
Confirm driveshaft length Challenger
by fury4speed
07/23/18 10:10 AM