Do I have this SS combo right? '74 Challenger 360
 

Hey All

Bear with me, learning the ropes..any and all help appreciated.

A 74 Challenger with 360 car would run SS/LA as its "native" class @ 3508 pounds +170 for driver.

SS/LA index is 11.45/7.36
national record is 10.60 @ 125.6

It would be required to run the same carburetor as the same car in Stock class (thermoquad 6453 or 6455S)

It can run a single 4 bbl carb aftermarket intake as long as it will accept a thermoquad? Can a holley intake be modified to accept a thermoquad? Can Intakes be ported in SS - It doesn't address this in the rules for or against?

It would run heads from the same list as a car running Stock class?

Do super stock pistons have to come from the list of NHRA approved stock pistons? The rulebook just says "replacement pistons permitted" and then lists qualifiers.

Also: This makes no sense to me: Dish pistons must retain half of original depth, and original diameter and configuration. Dish pistons must hold no less than original volume, per NHRA blueprint specs.

How could a dish be half of the original depth, original diameter and configuration, but still hold the original volume? What?

Any and all help appreciated.

Thanks

Steve

Re: Do I have this SS combo right? '74 Challenger 360
 

Didn't check your figures, but you can round off to the nearest 5 #

Any TQ that has the same venturi and throttle plate dimensions..Same as stock.

Any intake that keeps the carb in the same location, front to back, side to side.

Yes ,you can use whatever head casting you want as long as it's listed for that make, model ,year.

Any piston that looks something like the original on top, with the correct dome/dish volume.

We can assume that you would want to increase the valve reliefs substantially,as ANY lift lift is legal in SS. Therefore, they would hold quite a few more cc's than stock. Now you can decrease the original dish height to compensate.
Make sense now?

Good luck. That's all I know about 360 Mopars

Re: Do I have this SS combo right? '74 Challenger 360
 

OEM 360 pistons have no reliefs to begin with, so, yes, they would make up for the shallower dish.

Over the years, several intakes were extensively modified to work with a TQ, including LD 340, Offenhauser Port-O-Sonic (with popsicle sticks) and the Holley Strip Dominator.

Re: Do I have this SS combo right? '74 Challenger 360
 

We prefer a professionally ported andflowed Victor manifold if a Super Victor will not fit under hood.

On the big and small mopars, there are some additional Mopar
Performance heads that are legal only in Super Stock sometimes at
additional five horsepower and they are worth it.

Feel free to E Mail me if you need additional info as we have run
this combo over the years and might be able to save you some grief.

Racer7411@yahoo.com

Re: Do I have this SS combo right? '74 Challenger 360
 

You can build your own sheet metal intake in SS. Actually, I don't think there are limitations on the material. There are plastic or composite intakes out there. As Mark stated, same basic configuration (TQ facing forward as stock and sitting somewhat in the middle) and as long as you can shut the hood, your good to go.

Re: Do I have this SS combo right? '74 Challenger 360
 

John, is the '74 360 a decent combo to run currently, or would LXguy be better off running the car as a '73 with a 340 ?

Re: Do I have this SS combo right? '74 Challenger 360
 

Both are great combos currently.......have been reduced quite a bit over the years. I believe 360 is currently 269 in your body=== I ran it about 10 years ago at 285 and it was fine in my Volare with similiar to worse engine specs and a low budget. The 340 is at 266 currently in low ratio ( Mike Loge runs it in L solmetimes with a 9 inch tire stocker body Cuda). MY Dart has run K with no changes other than remove weight and will run under the index a
couple tenths with my stocker engine which tells you it is pretty soft combo. Really the Drag Packs in GT are only small block combos that are appreciably better in my opinion.

Re: Do I have this SS combo right? '74 Challenger 360
 

Thanks for the help guys.

I've got a mishmash of parts together thinking I'd run either a 74 360 or a 73 340 (just because it would be fairly easy to do with this car, didn't realize it would necessarily be a good combo). Still hunting up thermoquads...

How picky are they about stuff like that? If I showed up with, say, a 70 Dart with a 71 rear Bumper on it, or 71 "Swinger" emblem placement, does that get you kicked out?

On the Chally, I think the 73 and 74 would be pretty near identical externally.

Re: Do I have this SS combo right? '74 Challenger 360
 

As a hypothetical, say I showed up with this and wanted to run it as a '70 340 Swinger (I would remove the 1971 license plate - LOL). Obviously it would need a rollbar and such. Like I said, hypothetical.

Would NHRA have a problem with it?

http://s325.photobucket.com/albums/k...rt/dartone.jpg
http://s325.photobucket.com/albums/k...Dart/dart6.jpg

I can see changing the rear bumper to a '70, but would the not-correct-for-1970 side trim cause trouble? Or the lack of hood scoops from a 340 car?

Thanks, just curious how picky it gets.

Thanks again for answering my newbish questions.

Re: Do I have this SS combo right? '74 Challenger 360
 

They MIGHT raise a stink over the taillights/rear bumper, but possibly not. There is a red '68 Dart in SS - that I've seen a pic of - which has '69 taillights, so I'm thinking they either don't know the difference of they don't care enough to say anything.

The side trim and emblem placement won't be a problem.

I think if they do have a problem with the rear bumper they'd just let it go and ask you to install a '70 bumper before next time you come back.

Re: Do I have this SS combo right? '74 Challenger 360
 

Great looking car! I still have my '71 340 Demon that I ran in Stock and SS for many years. I am the original owner and it has 15,003 miles on it. Jim

Re: Do I have this SS combo right? '74 Challenger 360
 

Thank you very much. That is very helpful to know!

Wow. That's incredible. Demons are my all time favorite Mopars.

Thank you ! This one has 35K on it. Little old lady bought it, gave it to her daughter when she was already a little old lady, and then I got it from the grandson.

Was 318, now its got a 5.9 Magnum engine I pulled out of the junkyard (converted to carb). It has run 11.70 @ 113-still got the factory bench and everything.

Steve

Re: Do I have this SS combo right? '74 Challenger 360
 

Wide apart two scoops were optional on 70 340 cars. Unfortunately no 71 or
later swinger with anything bigger than 318. 340 in 71 only in 108" Demon type Dart.....according to NHRA. A number of 71 Swinger 340 were actually builtbut only for export according to my memory but not NHRA accepted unfortunately.

Re: Do I have this SS combo right? '74 Challenger 360
 

I guess they made 75 340 Swingers in '71, but they all went to Canada, as you say. I actually thought about trying to run this car with a 318 combo, but that tiny two barrel carb is going to be beyond my abilities.

That's why I was trying to get a barometer on what I'd have to do to run this car as a '70 in competition. The sheet metal (except rear bumper) is all the same, but I was curious how concourse they get about side trim and emblem placement type stuff.

Us civilians hear all kinds of horror stories about how people get kicked for not having the correct fog lights, but then you also hear that they don't do things that way anymore.

It would be a real kick in the jewels to show up for a race and get kicked for a bench seat, or a non-rally dash, and its not like any of this stuff is in the rules.

My interest is more in running the Chally than the Dart, I just wanted to get a theoretical case going.

Thank you

Steve

Re: Do I have this SS combo right? '74 Challenger 360
 

Your hearing "horror stories" from the '60's & '70's. :eek:

Re: Do I have this SS combo right? '74 Challenger 360
 

As far as instrument panels goes, you have to have the correct one for a '70 Dart, not necessarily a Rallye dash instrument panel. I know a SS/AH racer who had to put a stock cluster in his Barracuda before it would pass tech.