Stock mounts/K vs engine plate... Which is lightest..??

Planning out my 70 Challenger here. Its a 6-cyl car originally, so the K-member will have to come out. I have a V8 one and mounts already handy, but i gets to thinkin'...

If i were to shave off the engine mount stuff on my 6-cyl K-member and go with an aluminum engine plate instead, would i be saving or gaining weight? Does the K-member mounting pads + mounts + insulators add up to more than just a plate?

If its about the same i'd just stick with stock and swap K-members, but if there is even 10lbs in there it might be worth going with the plate. I'm assuming there are other benefits to switching to an engine plate as well...???

Weight is going to be a VERY important theme in this build. Light weight and simplicity. Yet i dont have much money for fancy stuff. I'm willing to spend time on the details.

More or less the same. Maybe a few pounds saved.
The stock K-member mounting pads, steel engine mounts, insulators along with the hardware bolts, washers and nuts will come out to be a little more in weight than a whole cross section aluminum plate, plate mounting pads welded onto the frame, engine/transmission limiters and all of that mounting hardware bolts, washers and nuts. Plus remember that you probably have to weld shut some spaces where the mounts were attached to the steering box mount on some cars.
You'll also have to shave the same difference off the water pump housing on the engine mounting surfaces to make up for the plates thickness.

I have used elephant ears to install B,RB and 426 hemi in Dusters and Demons, I would bet money that you will save around 18 to 23 lbs by using them, especially if you cut all the stock mounts off of the K member I have two motor plates in the shop now on motors, I'll bet money there is not 3 lbs more weight in them than the eelepahnt ears They can be trimmed down a bunch also Now, Get after it

Hmmmmmm......

A 'few pounds' to 23lbs... give or take. That sounds like a worthy endeavor.

I'm assuming the general simplicity ov the install and maintenance on the engine is a lot better with a plate or ears...???

Any downsides to doing this...???

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Hmmmmmm......

A 'few pounds' to 23lbs... give or take. That sounds like a worthy endeavor.

I'm assuming the general simplicity ov the install and maintenance on the engine is a lot better with a plate or ears...???

Any downsides to doing this...???

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I would go with the engine plate... so much easier
to get headers in... use a engine limiter also