Chassis Engineering AS-0305C comes as a pair of universal frame adapters for Box-style frames. These frame adapters work similar to AS-0304, except they come at a fixed length and only allows for a small amount of adjustment. These (AS-0305C) are 2 7/8 inch, measured from the edge to the center of the hole. Other lengths we have available for the AS-0305 frame adapters: AS-0305B – Boxed Frame 2-5/8″ Universal Frame Adapter AS-0305A – Boxed Frame 2-1/8″ Universal Frame Adapter AS-0305D – Boxed Frame 3-5/8″ Universal Frame Adapter Note: These adapters can only be trimmed slightly, so make sure to pick the length closest to your needs.
Important note: Because these are weld-on frame adapters, if the inner wall of your frame is thin or has holes, you may need to modify your frame by cutting a portion of the inner frame wall and replacing it with 3/16 inch steel. For best results, have a look at our engine mounts selection to find a matching set of mounts for your particular engine, and use our street rod engineered SS-0011 engine cushion set with Thru Bolt Construction for safety, stability and durability.
Don’t reinvent the wheel! We have a large collection of complete engine mount kits for various car models. Before going the universal route, have a look at our collection and see if there is a swap kit for your car listed. If there is, use that kit instead. If you can’t find a kit for your particular car frame and engine combo, you can use the steps below to determine which parts you need.
Each engine mounting kit is made up of 3 parts:
1a. Frame adapters. Our universal frame adapters come in different styles. For channel frames use AS-0106. For boxed frames use AS-0304 or our most popular AS-0305, which is available in 4 lengths. For top hat frames (1936-1954 Chevy cars) use AS-0204. All of our universal frame adapters are adjustable and can be cut to the length needed to properly align the frame mounts with the engine mounts. To determine the length of the frame adapters, use the information below to determine the frame width and the engine mount width: If you are using a boxed-type frame, measure the distance on the inside of the frame between the boxing plates. If you are using a channel-type frame, measure the distance on the inside of the frame between the side walls of the frame rails. if you are using existing engine mounts, measure between the center points of the engine block mounting points, otherwise use the chart below to determine the width of the mounts you need. Then simply subtract the engine mount width from the frame width and divide it by two (for a frame adapter on each side of the frame). Example: We have a frame of 23 inches wide. According to the chart, we would use 19″ engine mounts. 23 inches minus 19 inches leaves us with 4 inches, so the frame adapters would need to be (4 divided by 2) 2 inches long (from the edge to the center of the mounting hole). Again, before you go the universal route, check and see if we have a full kit for your car and engine combination listed. If we do, it will save you some fabrication work.
1b. Engine Crossmembers for use with wide frames. For cars with a wide (26 inch or more) frame, we have engine crossmembers available. We offer crossmembers with various drops. To determine which one would work best with your setup, locate the center line between the 2 engine mounts and place a flat strap across the bottom of the oil pan at this point. Then measure from here to the center of the crank shaft. This distance corresponds to the drop listed for the crossmember.
Note: Allow at least an extra 1/2 inch of clearance between the oil pan and the crossmember. If you use our 19 inch engine mounts, our engine crossmembers can be used with any engine.
2. Engine mounts. We offer engine mounts for a large variety of engines, in a number of different lengths to make them work with just about any frame type. The engine mount style is chosen based on the type (brand/model) of engine, and the engine mount length is determined by the width of the frame. For boxed frames, measure the distance on the inside of the frame between the boxing plates: For channel frames, measure the distance on the inside of the frame between the side walls of the frame rails. To determine the length for the engine mount, measure between the center points of the engine block mounting points. Then use the information below to determine the length you need.
Note: If you are using one of our engine crossmembers instead of our frame adapters, use 19 inch engine mounts.
3. Engine Mount Cushion Set. For all the Chassis Engineering Engine Mounting Kits we use our biscuit style, street rod engineered SS-0011 engine cushion set. This cushion set is impervious to gas and oil and offers great shock- and sound absorption as well as increased resistance to deformation and temperature extremes. It uses Thru Bolt Construction for safety and stability with a larger cross section to support even heavier engines.
WARNING: This product can expose you to chemicals including nickel and urethane, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.