A body big block back to small block

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Moparblake33

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Hey all just out of curiosity I've got a 1974 dart sport that has been big block swapped to do so I used the shumacker swap mounts. When using said mounts you have to cut the riverside of the k member to level the engine. I would like to swap back to a small block so what I'm curios of is. Can I use the schumaker swap mounts currently on the car or do I have to repair my k member and use factory mounts? Thank you for any info
 
I guess they now have big block to small block mounts...you will have to see whats required
 
Moparblake33 said:
Hey all just out of curiosity I've got a 1974 dart sport that has been big block swapped to do so I used the shumacker swap mounts. When using said mounts you have to cut the riverside of the k member to level the engine. I would like to swap back to a small block so what I'm curios of is. Can I use the schumaker swap mounts currently on the car or do I have to repair my k member and use factory mounts? Thank you for any info
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Big block mounts won't fit a small block, Schumacher or otherwise.
Use small block mounts and raise the mount the amount you removed.
 
I’d sell your k frame and mounts (and other bb parts) and buy a correct for your car k frame and mounts. Post a wanted ad in engines.
Syleng1
 
Too bad we are 2500 miles apart. I'd swap you my 68 small block K and original mounts for your big block k and mounts. Or the slant 73 K coming out of my son's Sport and buy you a slant to SB mount set.
 
so you had to cut the top of the tower off? either weld a new piece on or change the k-frame. use stock mounts.

just curious as to why you are going back to a small block?

mounts.JPG
 
Moparblake33 said:
Hey all just out of curiosity I've got a 1974 dart sport that has been big block swapped to do so I used the shumacker swap mounts. When using said mounts you have to cut the riverside of the k member to level the engine. I would like to swap back to a small block so what I'm curios of is. Can I use the schumaker swap mounts currently on the car or do I have to repair my k member and use factory mounts? Thank you for any info
Click to expand...
I did the same thing on my 75 Dart Sport. It started out as a slant six car and I installed a big block using the Schumacher conversion mounts. Ran it that way a few years and then removed the big block when it wiped a flat tappet cam lobe. Big block is on hold for a while and had a 360 small block so I checked the Schumacher instructions for the slant six to small block conversion and it showed the same modification to the k-frame.
I currently have a 360 LA engine with Schumacher slant six to small block V8 conversion mounts running and I did not have to further modify or reverse any of the modifications on the k-frame. Schumacher is currently up and running under the new ownership, so I would just get the small block conversion mounts and bolt it in.
 
Bobzilla said:
I did the same thing on my 75 Dart Sport. It started out as a slant six car and I installed a big block using the Schumacher conversion mounts. Ran it that way a few years and then removed the big block when it wiped a flat tappet cam lobe. Big block is on hold for a while and had a 360 small block so I checked the Schumacher instructions for the slant six to small block conversion and it showed the same modification to the k-frame.
I currently have a 360 LA engine with Schumacher slant six to small block V8 conversion mounts running and I did not have to further modify or reverse any of the modifications on the k-frame. Schumacher is currently up and running under the new ownership, so I would just get the small block conversion mounts and bolt it in.
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I would do that but my car started as a smallblock v8 so my k member is different
 
Syleng1 said:
I’d sell your k frame and mounts (and other bb parts) and buy a correct for your car k frame and mounts. Post a wanted ad in engines.
Syleng1
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That makes perfectly good sense. May be someone would like to trade.
 
Another consideration would be to run the front motor plate from AR Engineering, available through Mancini. I saw on here a neat idea to restrain the fore/aft movement with heims or turnbuckles coming off the rear transmission tabs to the crossmember. Not sure which method is cheaper or easier, just throwing out another option.
 
I wondered about the /6 to SB mounts too, but looking at the pictures it appears the /6 to SB conversion mount does not end up in the same place as the SB to BB mount does.

I think the only solutions are to swap out the k-frame or fix the existing mount. Worst case, he could trade for or buy a /6 k-frame and then buy the conversion mounts.

Personally, I wouldn't cut up a '73+ SB k-frame anymore. A /6 k can go BB or SB with the Shumacher mounts, but once the SB k is cut for the BB mount it take fabrication to go back. And with the option for Holley G3 mounts using the '73+ SB k-frame, they feel like a there is some value to them while a '73+ /6 k-frame is cheaper and easier to acquire.
 
pittsburghracer said:
I tried to warn you guys about putting big blocks in these street A body’s. Lol
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I'll bite.... What is the reason you are against these swaps?

My 440 has aluminum heads, intake, water pump and housing and I would bet good money (by that I mean US dollars lol) that my car is as light as it was when it had the all cast iron 340 in it. yes yes of course if you went with lighter stuff on the 340 I get the advantage.

My car stays cool, has silly torque, handles great for a Mopar, and gets lots of a attention with the hood up.

To the OP, why are you swapping back? Not giving you a hard time, just curious.
 
Muswagon said:
I'll bite.... What is the reason you are against these swaps?

My 440 has aluminum heads, intake, water pump and housing and I would bet good money (by that I mean US dollars lol) that my car is as light as it was when it had the all cast iron 340 in it. yes yes of course if you went with lighter stuff on the 340 I get the advantage.

My car stays cool, has silly torque, handles great for a Mopar, and gets lots of a attention with the hood up.

To the OP, why are you swapping back? Not giving you a hard time, just curious.
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Ok here goes. I’m not into street cars anymore. I’m not into raising my hood and impressing guys that see a big block in there and think it’s fast. With the stock front suspension in an A body it with handle 10 times better with a small block In it. It will be 50 times easier to work on with a small block in it. It’s lighter with a small block in it. And honestly a well built small block with common aftermarket parts will be faster than most big block A bodies.
 
Fair points… I would say that the seat in the pants is not the same but the rest is hard to argue
 
Muswagon said:
Fair points… I would say that the seat in the pants is not the same but the rest is hard to argue
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This is why I'm putting a 440 in my Valiant (if I don't die first).
Seat of the pants is really all I care about. I already have trophies for World's Best Lover and World's Hugest *****, and I'll never get a trophy for World's Fastest Car, so I really don't care how fast the car is, as long as puts me back in the seat.
 
jos51700 said:
This is why I'm putting a 440 in my Valiant (if I don't die first).
Seat of the pants is really all I care about. I already have trophies for World's Best Lover and World's Hugest *****, and I'll never get a trophy for World's Fastest Car, so I really don't care how fast the car is, as long as puts me back in the seat.
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Heck I hear all these 318 stories and I know they have to be capable of doing that.
 
Small block might be fun, but Sunday I was driving down a street with newer concrete in second doing about 30MPH. I hammered down and got thrown back, while spinning and a little sideways. Some small blocks might be able to do that, but I can tell you that smile lasted for hours
 
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