72 and 73 B body K frames same?
#1950713
11/13/15 09:03 PM
11/13/15 09:03 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
OP
I Live Here
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OP
I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Is a 72 and 73 K frame the same? What about SB and BB, does that make a difference?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 72 and 73 B body K frames same?
[Re: HotRodDave]
#1950814
11/13/15 11:38 PM
11/13/15 11:38 PM
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Joined: Apr 2003
Posts: 921
Long Island, NY
shocktrp
super stock
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super stock
Joined: Apr 2003
Posts: 921
Long Island, NY
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No, and if you use an oil pan from a 72 or earlier BB in a 73+ it hits the K-member.
Guess how I know...
Last edited by shocktrp; 11/13/15 11:38 PM.
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Re: 72 and 73 B body K frames same?
[Re: shocktrp]
#1952286
11/16/15 01:26 PM
11/16/15 01:26 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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 totally different. 73+ = rubber isolated + different engine mount perches (welded on from factory) for SB and BB. No, and if you use an oil pan from a 72 or earlier BB in a 73+ it hits the K-member.
Guess how I know... Are you using stock BB spool mounts in a SB k-frame? I have to ask because I have a 440 in my car and a generic 440source deep sump pan and it clears totally fine. When I bought my car it had a stock (1976 passenger car) 440 oil pan on it that the last guy had  to clear the k-frame because he did not use the proper conversion motor mounts when he put the 440 in where the 318 was. After I put in the conversion mounts from engine-swaps.com everything fit perfectly.
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Re: 72 and 73 B body K frames same?
[Re: DaytonaTurbo]
#1953233
11/17/15 09:04 PM
11/17/15 09:04 PM
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Joined: Apr 2003
Posts: 921
Long Island, NY
shocktrp
super stock
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super stock
Joined: Apr 2003
Posts: 921
Long Island, NY
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totally different. 73+ = rubber isolated + different engine mount perches (welded on from factory) for SB and BB. No, and if you use an oil pan from a 72 or earlier BB in a 73+ it hits the K-member.
Guess how I know... Are you using stock BB spool mounts in a SB k-frame? I have to ask because I have a 440 in my car and a generic 440source deep sump pan and it clears totally fine. When I bought my car it had a stock (1976 passenger car) 440 oil pan on it that the last guy had to clear the k-frame because he did not use the proper conversion motor mounts when he put the 440 in where the 318 was. After I put in the conversion mounts from engine-swaps.com everything fit perfectly. It's a numbers matching 400 so I would assume that it has the correct K-Member & mounts. From what I can tell I'm supposed to have a "971" pan but what I actually have is the cheap one that Summit says will fit everything; https://board.moparts.org/ubbthreads/ubbthreads.php/topics/54792/oil-pan-with-stamping-971.html
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Re: 72 and 73 B body K frames same?
[Re: HotRodDave]
#1954359
11/19/15 04:40 PM
11/19/15 04:40 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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The MP Chassis manual gives the specs, so it'd have the info you are asking about.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 72 and 73 B body K frames same?
[Re: screamindriver]
#1954406
11/19/15 06:01 PM
11/19/15 06:01 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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You've got to wonder how much difference there really is between the BB and SB K frames especially after looking at the pics...I know the Schumacher conversion is basically just lowering the mount on one side.. All I can say for certain is after switching from mid 70's BB spool mounts to the conversion mounts my 440 moved forward and down. Oil pan fits proper now, gained a smidge of hood clearance, fan is more parallel to the rad now, transmission mount fits better where before it was at its rear most adjusted just to get it to thread. When I got the car, the column shift linkage was cobbled and welded but I don't know if that had anything to do with having the wrong motor mounts. Normally I'm not one to sit there and crow about vendor's products, but fitment is night and day.
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