I have a 66 dart with a built 225. It has 10.5:1 with a mild cam and bored out 30 over with other stuff too. It is putting out about 225hp acording to the guy who built the engine for me. I have a some tranny work done like shift kit and 2800rpm stall torque converter. Now what i am trying to find out is a ball park figure for what my quarter mile time would be. If anyone has a good estimate to throw my way it would be appreciated greatly. Thanks

Johnny P

Mid 14's I'd say

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Thanks. Is that what your car runs? I think i am going to run 2.5" exhaust aswell. Is that a good size to run for what my setup sounds like?

What rear end and gearing does the car have?
The starting line at the dragstrip can be slick and a good 60 foot time make for a quick ET. you will need low gearing and traction to run a good ET.
DD

Not really sure what rearend. It has the stock gears that the 66 dart came with. I honestly have no idea what the gearing is. I am thinking about doing a dana 60 rearend later on. Is that something that is worth it and would help me out with my ET?

the dana 60 is overkill and expensive.If it were mine I'd want an 8.3/4 rearend.If you drive it on the street alot, go with 3.23 or 3.55 ratio.If not, try 3.91. Also a battery in the trunk is good for traction,and takes some weight off of the front.

Where can i get these 8.75 rearends? Do i have to get them from a junkyard or is there a place that sells them for aftermarket?

u r looking for a wrecked 67 and up "340" dart ,demon,duster or dart sport. Or one of these years without 340 383 that was equipped w a trailer package.DRUM TO DRUM.just look for round no bolts on backside pumpkin area.cost will be between $150 and $750 depending on condition,brakes,etc...MUCH cheaper than DANA.

Another good choice is a ford 8 inch rearend these are cheap and should not be hard to find. Know several racers that have used them. The only drawback you are limted to a few gear choices. The width is right and they are strong enuff for a good built slant. Hell a Dana 60 takes 40 horsepower just to turn it over. The 8 3/4 is the way to go if you can find an a body one, But if you find one out of a 340 car it will have small bolt pattern on the drums. Thanks Ron Parker

I believe that the 73 and newer 340 cars have the large bolt pattern.

True, but they also don't have 8.75 axles either.