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Olds 403 lower crank pulley

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Old August 19th, 2018, 07:53 PM
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Olds 403 lower crank pulley
Looking for the 8 1/8 OD 3 groove.
No rusty scaley ones. Have a junker already.
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Old August 20th, 2018, 08:58 AM
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I thought they only came with 2 grove?? I have one of those.

Johnny
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Old August 20th, 2018, 09:25 AM
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The 3 groove is what is on this 79 403
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Old August 20th, 2018, 11:12 AM
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Since it's a small block, won't a 3 groove crank pulley from a SBO 350 work?
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Old August 20th, 2018, 12:14 PM
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Hello, olds 350 may work. Can you measure the OD? Seems like the 403’s are 8.1 which is the issue
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Old August 20th, 2018, 08:31 PM
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Originally Posted by olds403
Hello, olds 350 may work. Can you measure the OD? Seems like the 403’s are 8.1 which is the issue
i have a 403 motor. Probably all the parts you need.
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Old August 20th, 2018, 09:03 PM
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Measured 1972 350 2bbl w/AC (3 groove) and got 7-7/8" OD.
It couldn't be any bigger on my car as it would hit the water pump pulley.
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Old August 20th, 2018, 09:07 PM
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It is for sure 8 1/8. Seems the 403 has odd pulleys. The stamp is LJ or something like that.
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