330 1/2" balancer bolt
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Registered User
Joined: Aug 2022
Posts: 8
330 1/2" balancer bolt
Hi all,
I'm hoping someone may know the answer to this. I have a 330 crank in a 403 which has the smaller 1/2×20 balancer bolt hole. Can anyone confirm if a standard BBC balancer bolt/washer will be correct? Im mostly concerned about the diameter of the washer being correct. ARP, Milodon.... don't seem to advertize an olds bolt that is smaller than the 3/4 one for the majority of olds engines. Thank you
I'm hoping someone may know the answer to this. I have a 330 crank in a 403 which has the smaller 1/2×20 balancer bolt hole. Can anyone confirm if a standard BBC balancer bolt/washer will be correct? Im mostly concerned about the diameter of the washer being correct. ARP, Milodon.... don't seem to advertize an olds bolt that is smaller than the 3/4 one for the majority of olds engines. Thank you
Registered User
Joined: Dec 2016
Posts: 1,986
From: Beautiful Southern Maryland
The BBC bolt is definitely 1/2" I have a couple with the washers at the shop I can measure on Monday if nobody comes up with an answer before then. I do know the washer is pretty thick, probably 1/4"
Registered Olds Owner
Joined: Apr 2018
Posts: 1,146
From: Los Angeles, CA
1965 425 also has 1/2-20 balancer bolt.
These are the measurements of the Olds bolt/washer.
The bolt shank is threaded all the way and about 1.20" long.
Washer is roughly .320 thick with a diameter of 1.75"
These are the measurements of the Olds bolt/washer.
The bolt shank is threaded all the way and about 1.20" long.
Washer is roughly .320 thick with a diameter of 1.75"
Out of Line, Everytime😉
Joined: Dec 2006
Posts: 10,129
From: Melville, Saskatchewan
What year did they change over? Glad to know what size my crank bolt is on my 330 crank, knew it was smaller. The BBC bolt isn't very long, it should fit.
Last edited by olds 307 and 403; Mar 25, 2023 at 01:38 PM.
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