CLASS RACER FORUM - View Single Post - 1970 Dart rear wheel size and offset for stock eliminator

mike coates · 09-08-2010, 08:56 PM

I have run a 70 swinger in IHRA pure stock for a couple of years.
I have used a MT 9 x 28 with an 8 inch rim and 4.5 inch back space.
I am using the Luneak springs, standard width and have trimmed the wheel well lip to the edge of the outer panel and the wheel opening about 1" in the front.

From what clearance I have, I would be surprised if you could fit a much bigger tire, but I haven't tried. I have about a quarter inch on each side and even with that, I have rubbed the spring. I have heard about the thin Calvert springs, which may gain half an inch. I would just hate to buy a wheel / tire and find out it doesn't fit. MT also makes a 29.5 x 9 inch radial, which is what I wanted to try.

I have thought about the offset hangers. I didn't think there would be an issue with that. I have seen several swingers in stock that have the big tires, I figured they were using the offset hangers.

I have never had much issue with traction with my set up, but I have only run 12.90's on the 13:10 index. I would like to fit a bigger tire, but like I said, I don't want to buy something and not have it fit. I will give it a try soon.

Another thing to consider is, there are not many options for the swinger if you run a regular stock class. The 340 is the biggest engine, then the 318 and the slant 6. Not many options.
If you are going to run a crate engine, that may be an option. I am going to try that next. I don't think I can build a 340 to run that good, my biggest issue is carb tuning knowledge ( and time to figure it out).
Hope this helps.

Mike Coates
IHRA 5914

09-08-2010, 08:56 PM	#6
mike coates Junior Member Join Date: Jul 2007 Location: Marshall, MI Posts: 33 Likes: 0 Liked 0 Times in 0 Posts	Re: 1970 Dart rear wheel size and offset for stock eliminator I have run a 70 swinger in IHRA pure stock for a couple of years. I have used a MT 9 x 28 with an 8 inch rim and 4.5 inch back space. I am using the Luneak springs, standard width and have trimmed the wheel well lip to the edge of the outer panel and the wheel opening about 1" in the front. From what clearance I have, I would be surprised if you could fit a much bigger tire, but I haven't tried. I have about a quarter inch on each side and even with that, I have rubbed the spring. I have heard about the thin Calvert springs, which may gain half an inch. I would just hate to buy a wheel / tire and find out it doesn't fit. MT also makes a 29.5 x 9 inch radial, which is what I wanted to try. I have thought about the offset hangers. I didn't think there would be an issue with that. I have seen several swingers in stock that have the big tires, I figured they were using the offset hangers. I have never had much issue with traction with my set up, but I have only run 12.90's on the 13:10 index. I would like to fit a bigger tire, but like I said, I don't want to buy something and not have it fit. I will give it a try soon. Another thing to consider is, there are not many options for the swinger if you run a regular stock class. The 340 is the biggest engine, then the 318 and the slant 6. Not many options. If you are going to run a crate engine, that may be an option. I am going to try that next. I don't think I can build a 340 to run that good, my biggest issue is carb tuning knowledge ( and time to figure it out). Hope this helps. Mike Coates IHRA 5914 __________________ Mike Coates TBD