72-73 Super Stock 340

S/ST 3040 · 07-18-2015, 03:25 PM

My first post here.

I'm interested in race weight and MPH of a strong, low compression 340 Mopar.
You can add 60' and other incrementals as well but, really looking for horsepower
based on weight and MPH from a competitive engine.
Thank you for the help.

FireSale · 07-18-2015, 05:57 PM

You can look in the NHRA Stock Car Classification Guide to find the weight based on the year/model and rated HP of the car you have in mind. Beyond that there are too many variables to predict. Maybe find the car as a stocker based on the guide and look up the class in the rule book. Then compare it to the national records for that class?

Dale

George Mirza · 07-18-2015, 09:13 PM

Check Nitro Joe's Stats, top of the page is a link. He keeps track of all the runs made at NHRA events. Not to many of those cars currently racing.

GTX JOHN · 07-19-2015, 03:38 AM

SS/KA = 123 to 125

SS/JA = 125 to 127

These are for a VERY good 340 Low Comp.

Our's are a couple slower unfortunately.

S/ST 3040 · 07-19-2015, 03:47 PM

Thanks for the replies.

After registering to Mr. Southerland"s website, I found more helpful direction.
I Googled current S/S records and see SS/KA MPH is at 128. Figuring 3266 lbs.
for a 72 Duster at minimum K weight comes out to 530 HP to match that MPH.

Thanks again for the help.

jims5600 · 07-19-2015, 04:40 PM

s/st 340, would that 530 hp be flywheel or rear wheel hp?

S/ST 3040 · 07-19-2015, 04:52 PM

I've always used it as flywheel HP.

(MPH x .00426)³ x Weight = HP

Rod Greene · 07-19-2015, 09:42 PM

The LC 340 loves a manual trans and a 72 Demon, 73 Dart Sport have the advantage of a hood scoop.

07-18-2015, 03:25 PM	#1
S/ST 3040 Junior Member Join Date: Jan 2015 Posts: 41 Likes: 4 Liked 1 Time in 1 Post	72-73 Super Stock 340 My first post here. I'm interested in race weight and MPH of a strong, low compression 340 Mopar. You can add 60' and other incrementals as well but, really looking for horsepower based on weight and MPH from a competitive engine. Thank you for the help.

07-18-2015, 05:57 PM	#2
FireSale VIP Member Join Date: Feb 2014 Location: Lakewood Washington Posts: 1,407 Likes: 29 Liked 237 Times in 126 Posts	Re: 72-73 Super Stock 340 You can look in the NHRA Stock Car Classification Guide to find the weight based on the year/model and rated HP of the car you have in mind. Beyond that there are too many variables to predict. Maybe find the car as a stocker based on the guide and look up the class in the rule book. Then compare it to the national records for that class? Dale __________________ Dale Shearon 68 Mustang 6394

07-18-2015, 09:13 PM	#3
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: 72-73 Super Stock 340 Check Nitro Joe's Stats, top of the page is a link. He keeps track of all the runs made at NHRA events. Not to many of those cars currently racing. __________________ GEORGE MIRZA STK 1236

07-19-2015, 03:38 AM	#4
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,483 Times in 697 Posts	Re: 72-73 Super Stock 340 SS/KA = 123 to 125 SS/JA = 125 to 127 These are for a VERY good 340 Low Comp. Our's are a couple slower unfortunately. __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 07-19-2015 at 03:35 PM.

07-19-2015, 03:47 PM	#5
S/ST 3040 Junior Member Join Date: Jan 2015 Posts: 41 Likes: 4 Liked 1 Time in 1 Post	Re: 72-73 Super Stock 340 Thanks for the replies. After registering to Mr. Southerland"s website, I found more helpful direction. I Googled current S/S records and see SS/KA MPH is at 128. Figuring 3266 lbs. for a 72 Duster at minimum K weight comes out to 530 HP to match that MPH. Thanks again for the help.

07-19-2015, 04:40 PM	#6
jims5600 Member Join Date: Oct 2011 Posts: 125 Likes: 47 Liked 21 Times in 9 Posts	Re: 72-73 Super Stock 340 s/st 340, would that 530 hp be flywheel or rear wheel hp?

07-19-2015, 04:52 PM	#7
S/ST 3040 Junior Member Join Date: Jan 2015 Posts: 41 Likes: 4 Liked 1 Time in 1 Post	Re: 72-73 Super Stock 340 I've always used it as flywheel HP. (MPH x .00426)³ x Weight = HP

07-19-2015, 09:42 PM	#8
Rod Greene Senior Member Join Date: Mar 2002 Location: TN Posts: 530 Likes: 420 Liked 242 Times in 81 Posts	Re: 72-73 Super Stock 340 The LC 340 loves a manual trans and a 72 Demon, 73 Dart Sport have the advantage of a hood scoop. __________________ Rod Greene Real men shift for them selves. Slowly working on TA Challenger for D,E/S and a 72 Challenger for SS/K, L as if I don't have enough other projects.