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Ford Mustang fastback GT390
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Discussion Starter #1
Hi all,
I'm changing my cheap ally radiator for a Big block 390 ACP brass & copper, ive took the petcock out of the old radiator to use in the new ACP rad but the petcock is to big, any idea what size petcock i would need.
Cheers Mark.
 

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12,205 Posts
The most common size is 1/4" NPT. Maybe the one you have is 3/8" NPT. If yours is 1/4" NPT then you need 1/8" NPT.
 

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4,653 Posts
Spend how many hundred dollars and no drain plug? Every radiator I ever bought came with the right part. What if you didn't have an old one to transfer?
 
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