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Posted 2019-09-27 1:33 PM (#588050)
Subject: 413 engine ID help needed

Veteran

Posts: 151
100

Location: Chattanooga

I have never seen a 413 with stampings like these. Is this a 1961 car engine? Somebody please shed some light on this for me please.

(idpad.jpg)

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Posted 2019-09-27 2:25 PM (#588052 - in reply to #588050)
Subject: RE: 413 engine ID help needed

Expert

Posts: 3305
2000

Location: NorCal

"R" is the year code for '61 but "M" is the year code for '59. The R being closest to the 41, I'd say it's a '61. What is the block casting date?

Posted 2019-10-28 8:27 AM (#589398 - in reply to #588050)
Subject: Re: 413 engine ID help needed

New User

Posts: 2

MR 413 stamped blocks are 1959 year engines. First year for the 413 cubic inch displacement.

Posted 2019-10-28 8:29 AM (#589399 - in reply to #588050)
Subject: Re: 413 engine ID help needed

New User

Posts: 2

the second set of numbers is the 9004 engine block serial number and if it has an iron cross stamp it has over sized bearings from the factory.

Posted 2019-10-28 2:28 PM (#589412 - in reply to #588050)
Subject: Re: 413 engine ID help needed

Expert 5K+

Posts: 8587
5000

Location: WHEELING,WV.>>>HOME OF WWVA

M = .001 "undersize" main bearing journals

R = 61

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