Thinking about an under drive crank pulley for my 305, good idea?

[1998_K1500_Sub]

I happen to have these underdrive pulleys for a reverse-rotation engine.

For reference, the original crank pulley on my 1998 L31 is 8" diameter.

If somebody wants them...

 

[cubandeathgrip]

I happen to have these underdrive pulleys for a reverse-rotation engine.

For reference, the original crank pulley on my 1998 L31 is 8" diameter.

If somebody wants them...

Hi , reverse rotation? what does that mean? How would I find out what rotation I have on my motor/ if this fits my truck I would like to get them.

 

[1998_K1500_Sub]

Hi , reverse rotation? what does that mean? How would I find out what rotation I have on my motor/ if this fits my truck I would like to get them.

“Reverse rotation” means the fan / water pump spins opposite the engine rotation.

These are the pulleys you and I have discussed prior.

 

[1998_K1500_Sub]

Hi , reverse rotation? what does that mean? How would I find out what rotation I have on my motor/ if this fits my truck I would like to get them.

Post some pictures of the front of your engine’s accessories, showing at least the crank pulley, alternator and water pump pulley.

 

[tpass]

Hi , reverse rotation? what does that mean? How would I find out what rotation I have on my motor/ if this fits my truck I would like to get them.

reverse rotation motors are used in boats with dual I/O's... one motor spins opposite rotation of the other. Your truck motor is not reverse rotation.

For those pulleys pictured it doesn't matter if reverse i/o, round is round. The only one that would probably be an issue would be the alternator pulley.. the cooling vanes would be opposite of what you need.