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440 .30 over questions?

bing69

bing69

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First, I would like to wish everyone a Happy 4th.

1. The 440 that I recently purchased in my 69 Roadrunner had numerous previous owners. I found a mechanic that had did some work on it a couple of years ago. He said that he ran a scope down the spark plug hole and could read the top of the pistons. He doesn't remember the brand name stamped on the top, but remembered that he said something about being bored .30 over. If that's true, what would be the true cubic inch now?

2. In the market to purchase a new starter; thinking about a mini high speed. They want to know how many teeth the flywheel has. Without counting the teeth, is there an easier way to find out?

3. The car has a Dyna rear end. Don't know what the gear ratio is. If I mark the rear tire and the drive shaft, what's the calculations as to the number of turns each that would give me that ratio?
THANKS IN ADVANCE
 
1. about 445 cubic inches
2. You need an early 80's (?) small block Dodge truck or similar starter. There are some variations in the two electrical connectors & engine block clearance, so research that. I'm not sure why you'd need to know the number of teeth??? 4 speeds with 10.5" flywheels & ones with 11" flywheels have different numbers of teeth, but take the same starter. (the one "oddball" is late 60's Hemi motors)
3. Dana's are cool. Stock rear end ratios are 3.54 or 4.10. If it drives pretty "normal" on the highway, you've got 3.54. If the engine is SCREAMING on the highway (high rpm) you have 4.10
 
Chalk mark tire and driveshaft. Turn tire one turn while counting how many turns of driveshaft. Purplebeeper's scrwaming on the highway is oh so true. Put 4.10's in my car 3500 rpms and I was being passed by everyone. There 3.73 and 3.91's but not common ratios.
 
69 roadrunners only had danas behind hemis and 440 sixpacks, no standard 440s either. I'm guessing that your drivetrain is not stock, so the dana could be an open, from a truck. First put both rear tires up in the air, and turn one tire. If the opposite tire turns in the same direction, you have a sure grip (most likely). Then turn the tires onr revolution and watch the driveshaft. Three and a half turns, 3.54, just over four turns, 4.10, just over four and a half, 4.56. If you get something under three and a half turns,(assuming it's not an open) then you might have a dana 61.
If you have an open, there are several good videos on you tube to determine what ratio you have.
Odds are it is a 3.54 sure grip, unless its a narrowed truck rearend.
 
PurpleBeeper said:
1. about 445 cubic inches
2. You need an early 80's (?) small block Dodge truck or similar starter. There are some variations in the two electrical connectors & engine block clearance, so research that. I'm not sure why you'd need to know the number of teeth??? 4 speeds with 10.5" flywheels & ones with 11" flywheels have different numbers of teeth, but take the same starter. (the one "oddball" is late 60's Hemi motors)
3. Dana's are cool. Stock rear end ratios are 3.54 or 4.10. If it drives pretty "normal" on the highway, you've got 3.54. If the engine is SCREAMING on the highway (high rpm) you have 4.10
Click to expand...
Thanks for the Reply PurpleBeeper. I was looking at a Promaster for the mini starter from Sumit Racing. They were asking how many teeth the flywheel had. Don't have an RPM gauge in it - gonna get one.
 
33 IMP said:
69 roadrunners only had danas behind hemis and 440 sixpacks, no standard 440s either. I'm guessing that your drivetrain is not stock, so the dana could be an open, from a truck. First put both rear tires up in the air, and turn one tire. If the opposite tire turns in the same direction, you have a sure grip (most likely). Then turn the tires onr revolution and watch the driveshaft. Three and a half turns, 3.54, just over four turns, 4.10, just over four and a half, 4.56. If you get something under three and a half turns,(assuming it's not an open) then you might have a dana 61.
If you have an open, there are several good videos on you tube to determine what ratio you have.
Odds are it is a 3.54 sure grip, unless its a narrowed truck rearend.
Click to expand...
Thanks for the reply 33 IMP. This car seems to have been through many hands before me; not sure what I got. 69 Roadrunner coupe; pretty sure the 440 six pack cam out of a 70 something. No sure about the 727 trans or the Dana rear end. I'm learning and taking notes. I'll check for those videos.
 
Fran Blacker said:
Chalk mark tire and driveshaft. Turn tire one turn while counting how many turns of driveshaft. Purplebeeper's scrwaming on the highway is oh so true. Put 4.10's in my car 3500 rpms and I was being passed by everyone. There 3.73 and 3.91's but not common ratios.
Click to expand...
Thanks for the Reply Fran Blacker. I'm writing all this stuff down so I don't have to ask the same question twice. My 69 Roadrunner is not numbers matching. 440 six pack came out of something else; not sure where the 727 or Dana came from. No fender tag or build sheet, nor RPM gauge. Gonna get a gauge quick.
 
7720EF40-68D5-4F54-91BD-47742C9969D1.png
Dana has a distinctive case.
 
Check for a pinion snubber mount on the Dana. If there, at least it's a Mopar B-body housing.
 
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