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Old 01-28-2007, 11:08 PM
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Small Block to Big block pullies

On my 86' Chevy C-10, Im going from a small block to a big block soon.
I have all the brackets and pullies from the 350 that are all still in good shape, but Im not sure if they will all fit on the 454 Im putting in.

Will my small block pullies and brackets work on the big block? Or am I gonna have to go junkyard diving for what I need?
Thanks in advance


Brad

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Old 01-29-2007, 02:04 AM
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Brackets for sure dont work block is way bigger so brackets are diff.bottom pully might need to be cut to fit the crank but the bolts holes should fit. The top pully i dont have and cant remeber if is workable. Hope this helps. I always love going to the pick and pull just to take stuff apart and see how it works. Chevys are mostly interchangeable stuff as in as long as its the same size motor. Or just a little inguinity.
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Old 01-29-2007, 07:17 AM
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"Cutting Pulleys"

Unless you are have access to a lathe to modify the pulleys, take the trip to the salvage yard. As a teenager, I hogged out the center of a pulley with a round file to fit a larger shaft. The pulley fit but was out of balance. It worked, for a while, until the imbalance wiped out the water pump bearings.
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Old 01-29-2007, 11:15 AM
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Thanks for the replies guys.
So far all I would need is the brackets and crank pully. Would all the other pullies line up and fit right with the new brackets?
Looks like I'll be going to the pick and pull soon. I actually do have a friend that has a lathe, so I might be able to use that pully.


Brad
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Old 01-29-2007, 11:54 AM
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Pulley ratios

Be sure to calculate your ratios while selecting pulleys. If the crank pulley on the 454 is larger than the SBC crank pulley you will have water pump and other driven components turning at much higher speeds than they were designed for. Besides consuming more power and accelerating wear on the driven items, spinning the water pump too fast can cause overheating of the engine. Sounds crazy but it is true. The coolant has to spend a certain amount of time in the engine to pick up heat and a like time in the radiator to drop the heat. If you are going to be really cranking this motor up on a regular basis, go with the smallest crank pulley you can find.
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Old 01-30-2007, 12:35 AM
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I agree. Thanks mike was late when I posted other nite.
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