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Don 'Mo Lurch'
Don 'Mo Lurch', Auto Mech / Electronics
Category: Chevy
Satisfied Customers: 20753
Experience:  Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
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I have a Chevy big block, the casting number is 3999289 and

Resolved Question:

I have a Chevy big block, the casting number is(NNN) NNN-NNNNand the year casting number is XXXXX the number stamped on the block is(NNN) NNN-NNNNMSW which I can't find any information on this number and the number on the piston top is L2377030. Can you help.
Jerry
Submitted: 7 years ago.
Category: Chevy
Expert:  Don 'Mo Lurch' replied 7 years ago.

 

 

3999289 = 1972 - 1979 454 cu.in. 270 hp
Used in Corvette, Trucks, Chevelle & Passenger Car

 

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If there is a Suffix Number located on Passenger Front of Head on Block Pad, please post that info to

 

 

Customer: replied 7 years ago.
The suffix number on theblock passenger front of head is(NNN) NNN-NNNNSW and on the rear of the block it has a 73 bulid number not 72
Expert:  Don 'Mo Lurch' replied 7 years ago.

 

As stated:

3999289 = 1972 thru 1979 454 cu.in. 270 hp
Used in Corvette, Trucks, Chevelle & Passenger Car

 

4540460MSW appears to be a Parts ( crate motor) or Rebuild Number as that does not appear in any of my Chevrolet info

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