HELP Identifying V8 engine
#1
03-21-2018, 12:51 PM
HELP Identifying V8 engine
Good morning everyone,
I'm being offered a deal on a rebuilt ready to run 396 ci motor. The individual states the motor is the high performance 375hp version. Is there any way to verify this based on the number code stamped on the block?
The stamp reads (3902406). I would be very appreciative if anyone is able to help me confirm that the motor is indeed a factory 375hp.
TIA
I'm being offered a deal on a rebuilt ready to run 396 ci motor. The individual states the motor is the high performance 375hp version. Is there any way to verify this based on the number code stamped on the block?
The stamp reads (3902406). I would be very appreciative if anyone is able to help me confirm that the motor is indeed a factory 375hp.
TIA
#5
03-24-2018, 07:25 PM
Good info here, that would be an L78 or L79( L79 aluminum heads) motor. Should be closed chamber rectangular port heads. Originally a solid lifter cam but rebuilt most likely a modern performance hydraulic replacement.
Big Block Chevy Engine Parts casting numbers and Identification
Big Block Chevy Engine Parts casting numbers and Identification
#6
03-25-2018, 03:43 PM
From nastyz28.com:
IV 1966/65 Chevrolet 396 325 THM400
IV 1968 Chevrolet 396 325 TH
IV 1967 Chevrolet 396 325 TH with AR (smog)
IV 1966/65 Chevrolet 396 325 THM400
IV 1968 Chevrolet 396 325 TH
IV 1967 Chevrolet 396 325 TH with AR (smog)
Last edited by Everett#2390; 03-25-2018 at 03:46 PM.
#7
03-25-2018, 06:08 PM
3902406 1967 396
325, 350, 375, 2&4 bolt
So with the IV it looks like the block at least is from a '67 325hp/396.
It could be a 2 or 4 bolt main block and could have been re-built to 375hp specs. What have you got for heads? Rectangular ports? SHP (stands for "special high performance") stamped on the inside under the valve covers?
#9
03-26-2018, 07:17 AM
Good info here, that would be an L78 or L79( L79 aluminum heads) motor. Should be closed chamber rectangular port heads. Originally a solid lifter cam but rebuilt most likely a modern performance hydraulic replacement.
Big Block Chevy Engine Parts casting numbers and Identification
Big Block Chevy Engine Parts casting numbers and Identification
The search continues. I’ll try and get some pictures of any future opportunities.
Thanks again,
#10
03-26-2018, 11:46 AM
My sources (Chevrolet parts manual) tell me that IV engine code is a 396 with 325HP (2 bolt mains) in 1965 through 1968 full size Chevrolets with TH400 trans without AIR. With AIR in 1967 would be code IN.
A factory aluminum head 396/375HP is an L89. The L79 is a 350HP 327 engine
A factory aluminum head 396/375HP is an L89. The L79 is a 350HP 327 engine