The motor mount and motor mount bracket in the following photo goes by a lot of names. A and B make up the Clamshell Style engine mount. GM refers to A as engine mount and B as a bracket. Nowadays, A is most commonly referred to as engine mount while B is most commonly reffered to as the Clam Shell. Engine mount is a loose term however and in order to not confuse the style of motor mount you have with the Early Style, you can refer to them as the Clamshell Mount. A can also be referred to as: rubber isolator, rubber mount, SBC/V8 engine/motor mount, "mounting, engine". B can also be referred to as: buckets, elephant ears, cups, motor/engine mount bracket, "bracket, engine mount", "bracket, engine mt". The Clam Shell Style started to phase out the Early Style Short and Wide/Tall and Narrow's in 1972.
A- Clamshell Mount; B- Clamshell
The clamshell itself (B) is no longer available from the dealership but the clamshell mount is still available at local parts stores. OER and other companies make reproduction C10 2WD clamshells but you have to understand that they are not a one size fits all. 2WD and 4WD clamshells will not interchange for instance. Clamshells are passenger/driver oriented as well. It is good practice to label them if you are removing them to install newer clamshell mounts to avoid any confusion later. You do not need to worry about acquiring the correct clamshell when using our EZ Mount conversion mounts.
Late model Impala and Caprice frames have offset engine mounts on the frame. They are not straight across from each other. This limits the amount of adjustability in the motor mounts to around 1 1/2 inches.
V8 Clamshell Mounts for 1991-1996 Impala
4-bolt SBC (rubber): WESTAR EN2292, DEA / MARMON RIDE CONTROL A2292, ANCHOR 2292, PIONEER 602292, GM GENUINE 22188497
4-bolt Energy Suspension Poly Insert: 3.1116G (Black), 3.1116R (Red)
Poly Insert Install Instruction
Conversion Motor Mounts
DD-3575C
DD-3575C installed onto stock clamshell mounts with the Energy Suspension Poly inserts.
LS Oil Pan Options:
302-2
302-3
The Holley 302-2 is a modified F-Body pan. The 302-3 is basically the second revision. The 302-3 has turbo drain ports on either side of the pan, can do a larger stroke, and has better clearance from the engine crossmember. Out of these three pans, the 302-3 is superior in every way. You will have to cut the windage tray a little and you still have to buy the dipstick/tube and the gasket.
Oil Pan Dimensions
Here is an LS engine almost all the way forward on the adjustable EZ Mounts (DD-3575C) which gives you almost 2 inches of firewall clearance to the back of the engine. Shows steering at full lock to lock with the 302-2 pan clearing with no issues.
Power Steering
All the way up to 1979, the factory gearbox takes an inverted flare fitting. That means your 91-96 B-body uses the same exact fitting for any hydraulic power steering pump found on an LS engine! Use the following information to figure out what fittings you need for your power steering lines.
|
|
Pressure |
Return |
|
LS Power Steering Pump |
M16x1.5 O-Ring |
Hose Clamp |
|
Before 1980 Gearbox (SAE) |
5/8"-18 |
11/16"-18 |
|
After 1980 Gearbox (Metric O-Ring) |
M16x1.5 O-Ring |
M18x1.5 O-Ring |
If your O-ring is old and hard, use the following part number for replacements: GM 26001594
DO NOT use any O-ring you find at the parts store. The Metric O-Ring fitting requires an O-Ring made of Viton so the power steering fluid doesn't destroy them.
O-Ring Technical Info: 903 (7.65mm ID x 1.63mm C/S or .301 ID x .064 C/S) Viton
If your vehicle has the Metric O-Ring fittings, then your power steering lines will bolt straight up to any power steering pump offered in an LS application. Make sure there isn't an O-ring already in the power steering pump from the old line!
If your vehicle has the SAE fittings AND the 3/8" lines line up to the back of your LS power steering pump, all you need is THIS ADAPTER (YOUR 91-96 B-BODY DOES NOT NEED THIS ADAPTER) to be threaded into the high pressure port on the pump. The power steering pump side is M16x1.5 with a Viton O-Ring while the power steering line will fit a 5/8"-18 Inverted Flare.
3/8" Line threaded into the adapter fitting on the back of an LS truck power steering P pump with THIS ADAPTER
Check out Lee Power Steering for all your GM gearbox needs. They can rebuild and do precise valve tuning to give you that exact steering you are looking for!
Engine Accessories
We make many different options for front engine accessories. Here are a couple examples.
DD-LS-ALT-PS-AC-SAN-VVT
DD-LS-ALT-PS-2-AC-R4
