Measuring the width of the subframe rails told us that a piece of 3x3-inch square tubing would work for the subframe mount once we cut off one wall. We decided to make a cradle that bolted the new engine to the MG’s unibody subframe. The MGB engine mounts are located at the front of the engine, while the Miata’s are lower and toward the middle of the block. This process applies to a broad variety of applications, because unless the aftermarket has already produced a bolt-together solution for your swap, we’ll both be traveling down a similar road. Now begins the detail work: designing a set of engine mounts that make this swap look and function like a factory installation. We could have modified the shifter instead, but this seemed like the best fix in our case. Our one compromise involved the shifter: It now sits about 2 inches farther back, requiring a small tunnel modification. We also kept the original engine’s 3-degree slope–this retains the stock pinion angle and keeps the driveline happy. We made sure the engine was both straight in the chassis and level from side to side. Our test subject is a Miata-powered MGB GT, and in the first installment we spent considerable time getting our new powerplant properly situated in the engine bay. It’s the detail work that separates an awesome build from a piece of stagnant garage art. Paint the adapter plate powder coat as desired.When it comes to engine swaps, simply fitting the new powerplant under the hood is only half the battle.(0.5625″ = 9/16″.) Some may need to be countersunk or tapped this is noted on the drawing. Drill out the holes to the diameter marked.Cut the plate to length with a chop saw or Sawzall.Use a center punch to mark the hole centers.Cut out the template and tape it to a piece of 1/4″ steel plate.Make sure to set the size option to actual size. Select the template that best fits your installation needs.What we’ve done here is create downloadable PDF files based on the measurements for the LS and traditional small block mounting holes, to make it easy to get your measurements right. There’s a couple different designs floating around out there that locate the motor in different places. These plates are easy to make out of steel plate – all you need is a chop saw and a drill. One of the most popular ways to fit an LS motor in place of a first generation small block or big block is to make a set of adapter plates that bolt to the side of the block that accept regular small block Chevy motor mounts.
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