Hi. This car is 66 chevy but the motor is a 1984 chevy 350 4bolt main stroked to 383. I think its an '84, might be an '85. I need to replace fan clutch and water pump.... the fan clutch is bad but manufacturer of the replacement parts says you must do water pump and fan clutch together. Is the pump a 66 chevy pump or a 350 small block pump? What about the fan clutch? Ok, and please help with motor mounts. do I use mounts specific for 66 model or specific to the motor?
It's a Gen 1 small block V8. There are only two types of small block water pumps, long shaft and short shaft. Short shaft pumps were used on pre 1968 motors. The long pump measures 7 1/4 from the mounting surface to the outside of the clutch mounting flange, the short pump measures 5 5/8. The mounts should be for a small block in the same body type you are using it in. Back in the 50's there was a different mounting system that bolted to the front of the block, but everything since then is compatible. By the way, if the motor is in a 1966 body with the standard radiator, use the short water pump, iron or aluminum makes no difference except in cost.
?? I've never heard of a water pump that had to be replaced because you were changing the fan cluth?? Often they advise you to put in a new clutch when you change the pump, but you do not HAVE to. Anyway, a pump for a 84 85 350 will be the same -- doesn't matter if it is stroked or bored or however hotrodded.
You want the pump specific to the engine. And the motor mounts specific to the vehicle. I have never seen a fan clutch that cannot be replaced separate from the water pump.
The pump is whatever fits the ENGINE. End of story.
