big block Motor Mounts???

[zap275]

Replacing tired 6.2 diesel with a BB 454 and looking for motor mounts that will be put in a 1984 K5 Blazer. Anyone with pertinent information where they can be located would be helpful. Thank you.

[zap275]

Nobody has a Clue on here????????????? OMG

[gchemist]

Originally Posted by zap275

Nobody has a Clue on here????????????? OMG

Sure hope that was a teen replying on your thread.

The diesel uses BOP mounts. Buick/Old/Pontiac

Read this: http://67-72chevytrucks.com/vboard/s...d.php?t=276098

[v30crewcab]

my 88 6.2 took the same motor mount as a 454. now it has a cummins sitting on the same two motor mounts.

[gchemist]

Considerations when swapping between big block and small block Chevrolet engines (not a complete list):

- Engine mounts. While small blocks and big blocks will physically bolt onto each others' mounts, the engine may move up or down, or left or right, depending upon the specific engine part and chassis part of the mounts that are being used.

- Cooling system. Big blocks often need additional cooling and therefore bigger and/or thicker radiators. Also, you may find the radiator hoses need to be changed, and same with heater hoses. The location may change slightly, so be prepared.

- Radiator fan shroud. Again, depending upon the mix and match of engine mounts, water pumps and fans you use, the fan shroud may need to be replaced or modified. Electric fans are an alternative.

- Alternator wiring. Depending upon the exact set ups of each of the engines, you may find that the alternator wiring has to be extended/shortened/rerout ed to accommodate the new set up.

- Fuel lines. Especially important if running a mechanical fuel pump as some pumps have 3 lines while others have 2, and the size of the lines can vary somewhat as well.

- Oil pressure/water temperature senders. You may need brass adapters and/or extra electrical wire to accommodate the new senders' locations.

- Valve cover to vacuum brake booster. Many times, big block engines are very close or even touching the vacuum brake booster.

- Valve cover to heater/air conditioning box. Just like on the driver's side and the vacuum brake booster, you may encounter clearance issues between the big block engine and heater/air conditioning box on the passenger's side.

- Exhaust system. Pretty self-explanatory.

- Flex plate. The flex plate must, of course, match the rotating assembly of the engine with regard to external versus internal balance. Likewise, the torque converter must bolt to the flex plate, and in general, there are 2 different bolt patterns for Chevrolet torque converters.

- Air cleaner to hood clearance. Especially important if running a performance-style of intake manifold on the big block. Some intakes raise the carburetor quite a bit, necessitating a drop-base air cleaner assembly.

- Shifter linkage. This applies to standard transmission set ups and factory shifter-equipped automatic transmissions. If you're running a cable-operated floor shifter, most of time you won't have issues.

- Accessory brackets. For example, if the vehicle has power steering that you want to retain, you will likely have to change the bracket that mounts the pump to the engine. Salvage yards or aftermarket brackets are options if the replacement engine did not come equipped with the proper brackets.

- Air conditioning. Same sort of issues. Brackets will be different, and some engines have the compressor mounted on the passenger's side while others have it on the driver's side.

Not an exhaustive list, but I think I've included some of the things that haven't been mentioned yet.

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