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Motor Mounts
Pontiac V8 Motor Mounts
Start With the Chassis — Motor Mounts for Pontiac V8s
A Pontiac V8 hangs on two separate pieces of hardware, and motor mounts is where both of them live. The engine mount bolts to the side of the block, the frame mount bolts to the chassis, and the two clamp together through a single through-bolt. Get either half wrong and the engine sits crooked, the pan fouls the crossmember, or the mount tears under load.
Butler splits this section by chassis and year. You will find Butler Performance frame mounts, engine mount adaptor kits, stock-style replacement rubber frame mounts, polyurethane and stainless mounts, solid mounts, frame mount spacers, and adaptor plates for putting a block in a chassis it did not come in.
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More About Motor Mounts
1. Two Halves, Not One Part
People order the wrong thing here more than anywhere else in the catalog, almost always because they asked for "motor mounts" when they needed the other half.
| Engine mount | the bracket that bolts to the machined pad on the side of the block. Its bolt pattern is set by the block, not the car. |
| Frame mount | the piece that bolts to the chassis and carries the rubber, poly or steel biscuit. Its shape is set by the car. Butler carries sets for the 1964-72 GTO, LeMans and Tempest and for the 75-81 F-body. |
| Spacers and adaptor plates | the fix when the two halves are right but the geometry is not. Butler stocks 3/16" frame mount spacers for A-body and 75-81 F-body cars, plus engine mount adaptor kits for mixing block and chassis generations. |
2. Rubber, Polyurethane or Solid
This is the real decision on the page, and it is a trade of noise for control.
| Rubber | stock feel. It isolates idle shake and driveline buzz from the body, which is what a street cruiser or a correct restoration wants. Butler carries stock-style replacement rubber frame mounts that put the factory isolation back and nothing more. |
| Polyurethane | the middle ground and the right answer for most strong street builds. Poly lets far less engine movement through than rubber while still soaking up enough vibration to live with. Butler's polyurethane and stainless mounts and billet poly frame mounts are rated well past stock power. |
| Solid | steel to steel, no give at all. Nothing controls the engine better and nothing transmits more into the car. Idle shake and exhaust drone come straight through the floor, and load that a rubber mount would have absorbed goes into the block pads and the frame instead. That is the right trade in a race car, where the engine has to stay put under a hard launch. In a street cruiser it wears on you. |
3. Two More Things Worth Knowing Before You Order
| Heat kills poly | Butler's own product notes are blunt about it. If you are running headers or Ram Air manifolds, ceramic coating is highly recommended, and a heat shield or header wrap keeps heat off the mount. Excessive heat can melt or deteriorate polyurethane. |
| Aftermarket blocks | Butler notes that IA2 blocks must be clearanced or notched higher to fit the solid mounts. |
Pick your car's year and body first, then choose rubber, poly or solid by how the car actually gets used. If the engine and the chassis are from different generations, start in Engine Adaptors.
75-81 F-Body Firebird/TA 67-69 Firebird/TA 70-74 F-Body Firebird/TA 64-72 GTO, Lemans, Tempest Engine Adaptors
Not sure what your Pontiac needs?
Email our tech team at tech@butlerperformance.com. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.