I have a 71 dodge motor. It came our of a motor home. The valve covers say it's a 413 rb motor. I took the number off the heads and looked it up. It is a 413. My problem is, there is no block casting number anywhere on the motor. I have searched that thing so much but still no number. The only numbers that are on the motor is 5R (on front of motor) and there is three 6's placed on each side of the block and on the back by the flex plate. The other problem is, I can't find piston's for a 413. They are all either for a 383 or 440. I'm probly us gonna have to bore it an 1/8th inch to a 440. Need some opinions guys. And some history on this block. Thanks

 

Look on the extended pad pointing forward next to the Distributor... Should be stamped their..
https://www.google.com/search?q=Big+...1FDd5dKYhLM%3A

 

Your Piston are listed here :
https://www.uempistons.com/catalogs/...te_catalog.pdf

 

Bob I like the way you jump in and help the new guys out!

 

Only when I have time.....lol

 

I'm going to help you one of these days.....

 

Well I've still got a bathroom and a hallway to finnish Bob, come on over.
The bear and pizza is on me!

 

Oh...Ok... Sheeeeesh... Let me turn my Skype on, I'm so with you on this...

 

Ok. I found it. Thank you. It has HT 413. And underneath it, it has 7 14. What does the 7 14 mean?

 

Glad you found it... The other numbers, I dont remember..
It might be number in line and the casting batch or something like that?

 

If it's on the pad it could be application, truck as opposed to industrial.??
Just a thought