390 crank question

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Nov 1, 2006 | 08:11 PM

#16

baddad457

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Joined: May 2003

Posts: 11,141

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From: south louisiana

Quote:

Originally Posted by extreem

well i mentioned in another post that i really dont know much about motors, aside from the basics. So what's the difference between a 2U and 3U? I've also seen std/std , 10/10 , and 20/20. What does this mean? Sorry for my ignorance on the subject but i'm still learning! I thank you both for the offers, but if i can i'll probly snag one off Baddad if they're ready to go. Rather than having to take the time to get one turned. If that's the case i might be able to save you a trip to the cousins RJ

Thanks again guys

2U is a late 60's casting, 3U is a 70's 390 crank. Same crank, just different casting numbers. std/std, 10/10, 20/20, refers to the main and rod journal sizes. std/std means it's never been turned undersize, 10/10, 20/20,etc is the amount ground off the journals when turned to true up the journal(s)