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Old 05-06-2013, 07:07 PM
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SBC Pulleys

I am building a 400 SBC and recently purchased a new crank and water pump pulley. When I tried to install them they do not clear each other on the outside diameter. The crank pulley OD is approx. 7 1/8" and the water pump pulley is approx. 7".

Did I get BBC parts by mistake or is the size just not correct for Chevy?

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Old 05-06-2013, 09:50 PM
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Crank pulley is 6 7/8", pump pulley is 6 1/4".
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Old 05-07-2013, 05:00 PM
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My current plan is to use the crank pulley and get a smaller water pump pulley so that they clear.
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Old 05-07-2013, 05:38 PM
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Here is a page from March Performance that shows the various pulleys they offer - with measurements. FORD 429-460 C.I. V-BELT PULLEY SETS the title says Ford 429... but the page has chevy small block info.
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Old 05-07-2013, 07:38 PM
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Quote:
Originally Posted by WICruiser View Post
I am building a 400 SBC and recently purchased a new crank and water pump pulley. When I tried to install them they do not clear each other on the outside diameter. The crank pulley OD is approx. 7 1/8" and the water pump pulley is approx. 7".

Did I get BBC parts by mistake or is the size just not correct for Chevy?
The only 7" WP pulley I'm aware of is for the short pump. The short pump pulley is very deep:

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Old 05-07-2013, 08:07 PM
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Yes, I have the short water pump. I should have probably mentioned that but I thought short versus long pump only influenced the depth. As you say it is very deep.

Everything would be great if the two pulley outside diameters didn't interfere with each other. So my plan is to keep the crank pulley and go down in water pump pulley size to get the clearance that I need.

Probably end up selling the pump pulley I got to someone that has a smaller crank pulley.
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