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I have a quick question, what bolt pattern does my car, which came frome the factory with fornt disks, have? 4.5"? And is that is the same front to back right? Because I'm reading all these posts about bolt circles and they say that A-bodies had small bolt patterns. The reason I'm asking is that I'll soon be swaping in a b-body 8 3/4 and I'm wondering if my front and back will have 2 diffrent bolt patterns then. The way i got it and the way it sits there is an adapter on the rear to get the rims to bolt up, well either that or it's a funky looking spacer. Thanks, I feel like and idot asking this qestion, i'm sooo confused.
 

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You will have 4.5 BC, with an 7 1/4 or 8 1/4 rear end factory. So the BC will match the B body rear.
 
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Keith Mopar said:
You will have 4.5 BC, with an 7 1/4 or 8 1/4 rear end factory. So the BC will match the B body rear.
doesnt it matter what year car he has?72 older should be 4" and 73 up are large pattern on an a -body.i'm not completely sure though,can't you just measure the fronts to see what u have?
 

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I believe this topic has been discussed on this site before and I remember reading that you had to take into account the year of the car and the engine size. I think big blocks came with the larger bolt pattern 4.5. I am sure one of the experts will chime in on this topic before the day is out. Good luck!!!
 

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mopar stu said:
Keith Mopar said:
You will have 4.5 BC, with an 7 1/4 or 8 1/4 rear end factory. So the BC will match the B body rear.
doesnt it matter what year car he has?72 older should be 4" and 73 up are large pattern on an a -body.i'm not completely sure though,can't you just measure the fronts to see what u have?
The reason I sain he has 4.5 because in his sig it says 74 DDS, now that made me think his car was a 74, but I should never ass ume. My mistake. **(*)

By the way 74DDS what year is your car? Like Mopar Stu says, 73 up = 4.5, 72 down + 4.0
 

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Big block cars DID NOT have big bolt pattern.

ALL a-bodies built PRIOR to the 1973 model year left the factory with the 4" pattern.

ALL V-8 a-bodies built starting with the 1973 model year and going to the end in 1976 had disc brakes with 4.5" pattern.

ALL /6 A-bodies from 1973 to 1976 WITH disc brakes had the 4.5" pattern.

ALL 1973-1976 a-bodies WITH front DRUM brakes had the 4" pattern.



 

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Jim_Lusk said:
Big block cars DID NOT have big bolt pattern.

ALL a-bodies built PRIOR to the 1973 model year left the factory with the 4" pattern.

ALL V-8 a-bodies built starting with the 1973 model year and going to the end in 1976 had disc brakes with 4.5" pattern.

ALL /6 A-bodies from 1973 to 1976 WITH disc brakes had the 4.5" pattern.

ALL 1973-1976 a-bodies WITH front DRUM brakes had the 4" pattern.
Exact-a-mundo !   Although, I didn't realize it was a v8/disk thing 73 and up.  I just thought if it had disks 73 and up it had the large bolt pattern and small for all drums.  Interesting.
 

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Yes, if it had discs 73-up they were big bolt, BUT ALL 73-up V8 cars had discs. The drums were only available with the /6 and only up to some point in the 76 model year (maybe Jan 1).



 
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