Previous Thread
Next Thread
Print Thread
Page 1 of 3 1 2 3
Quarter Mile time for 1971 440+6 Roadrunner #2484028
04/17/18 03:15 AM
04/17/18 03:15 AM
Joined: Apr 2010
Posts: 86
Oak Forest, Texas
M
markshemiworld Offline OP
member
markshemiworld  Offline OP
member
M

Joined: Apr 2010
Posts: 86
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!

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484032
04/17/18 03:28 AM
04/17/18 03:28 AM
Joined: Apr 2016
Posts: 184
Memphis,TN
J
J. Hammer Offline
member
J. Hammer  Offline
member
J

Joined: Apr 2016
Posts: 184
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.

Last edited by J. Hammer; 04/17/18 03:30 AM.
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484039
04/17/18 03:57 AM
04/17/18 03:57 AM
Joined: Mar 2008
Posts: 883
Affton MO
Q
qwkmopardan Offline
super stock
qwkmopardan  Offline
super stock
Q

Joined: Mar 2008
Posts: 883
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.

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484045
04/17/18 05:20 AM
04/17/18 05:20 AM
Joined: Jun 2014
Posts: 5,183
P
Porter67 Offline
master
Porter67  Offline
master
P

Joined: Jun 2014
Posts: 5,183
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.

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484048
04/17/18 06:03 AM
04/17/18 06:03 AM
Joined: Jan 2003
Posts: 20,149
Park Forest, IL
slantzilla Offline
Too Many Posts
slantzilla  Offline
Too Many Posts

Joined: Jan 2003
Posts: 20,149
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."
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: qwkmopardan] #2484087
04/17/18 10:19 AM
04/17/18 10:19 AM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
iagree Low 13s or high 12s w/ different tires that will hook and considering it's tuned well.


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
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484089
04/17/18 10:24 AM
04/17/18 10:24 AM
Joined: Mar 2005
Posts: 1,581
N/E, Michigan
RATTRAP Offline
pro stock
RATTRAP  Offline
pro stock

Joined: Mar 2005
Posts: 1,581
N/E, Michigan
low 14 high 13 IMO

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484120
04/17/18 11:21 AM
04/17/18 11:21 AM
Joined: Oct 2015
Posts: 570
UK
rb446 Offline
mopar
rb446  Offline
mopar

Joined: Oct 2015
Posts: 570
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
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484153
04/17/18 12:20 PM
04/17/18 12:20 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
F
fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
F

Joined: Jan 2003
Posts: 14,479
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 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484171
04/17/18 12:47 PM
04/17/18 12:47 PM
Joined: Apr 2010
Posts: 86
Oak Forest, Texas
M
markshemiworld Offline OP
member
markshemiworld  Offline OP
member
M

Joined: Apr 2010
Posts: 86
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?

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484178
04/17/18 12:54 PM
04/17/18 12:54 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Online work
"Little"John
pittsburghracer  Online Work
"Little"John

Joined: Feb 2005
Posts: 20,116
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
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484179
04/17/18 12:55 PM
04/17/18 12:55 PM
Joined: Jun 2014
Posts: 5,183
P
Porter67 Offline
master
Porter67  Offline
master
P

Joined: Jun 2014
Posts: 5,183
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.

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484187
04/17/18 01:02 PM
04/17/18 01:02 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
F
fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
F

Joined: Jan 2003
Posts: 14,479
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 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484206
04/17/18 01:32 PM
04/17/18 01:32 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
master
dvw  Offline
master

Joined: Mar 2006
Posts: 9,791
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

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484230
04/17/18 02:38 PM
04/17/18 02:38 PM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
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.

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484231
04/17/18 02:42 PM
04/17/18 02:42 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
ScottSmith_Harms  Offline
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
Aluminum rods?

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484289
04/17/18 05:14 PM
04/17/18 05:14 PM
Joined: Feb 2003
Posts: 18,582
Rust Belt, SW PA
Silver70 Offline
I Live Here
Silver70  Offline
I Live Here

Joined: Feb 2003
Posts: 18,582
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
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484297
04/17/18 05:34 PM
04/17/18 05:34 PM
Joined: Aug 2011
Posts: 2,843
Pattison Texas
CSK Offline
master
CSK  Offline
master

Joined: Aug 2011
Posts: 2,843
Pattison Texas
15.20


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: DaytonaTurbo] #2484395
04/17/18 09:59 PM
04/17/18 09:59 PM
Joined: Nov 2010
Posts: 3,696
jersey
S
Spaceman Spiff Offline
master
Spaceman Spiff  Offline
master
S

Joined: Nov 2010
Posts: 3,696
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!
Re: Quarter Mile time for 1971 440+6 Roadrunner [Re: markshemiworld] #2484398
04/17/18 10:06 PM
04/17/18 10:06 PM
Joined: Apr 2010
Posts: 86
Oak Forest, Texas
M
markshemiworld Offline OP
member
markshemiworld  Offline OP
member
M

Joined: Apr 2010
Posts: 86
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?

Page 1 of 3 1 2 3






Powered by UBB.threads™ PHP Forum Software 7.7.1