Small Block to Big Block?

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Best truck design

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Lexington KY
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Chas
Truck Year
1973
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Sierra C2500
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350
I am wanting to start the process of finding the parts to make the switch from a small block to a Big Block.

Need some help in the following:

Power Steering pump bracket will it transfer, I think the PS pump is the same.

I know I need a new alternator bracket.

Any of the engine pulleys? Or are they all unique to the small block?

Already have the Big Block A/C bracket.
 

shiftpro

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For sure you will need big balls...
 

nvrenuf

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Assuming you're going with the typical V belt set up -

The p/s pump will interchange but the brackets are different. The reservoir is held to the pump by a couple of bolts, a big block needs a stud in the lower position for the bracket (some already have it, some don't)

The only accessory mounting bracket that interchanges is the spacer on the long alternator bolt.

The alternator, power steering and water pump pulleys will interchange.
 

4WDKC

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I am wanting to start the process of finding the parts to make the switch from a small block to a Big Block.

Need some help in the following:

Power Steering pump bracket will it transfer, I think the PS pump is the same.

I know I need a new alternator bracket.

Any of the engine pulleys? Or are they all unique to the small block?

Already have the Big Block A/C bracket.

Do you already have the big block?
 

Best truck design

Full Access Member
Joined
Oct 7, 2018
Posts
83
Reaction score
36
Location
Lexington KY
First Name
Chas
Truck Year
1973
Truck Model
Sierra C2500
Engine Size
350
No, I am gathering parts as we speak. I did a Sbc to BBC conversion in my Chevelle about 10 years ago, but I can't remember what swapped and what didn't.
 

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