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Topic Review (Newest First)
01-08-2013 07:14 PM
cdminter59
396 350 375

Well the first thing to do is get the casting number from the flange the transmission bolts to. I think its on the passenger side. Then same flange on the driver's side there is a casting # starting with a letter with 2 or 3 numbers. Example: C28. On the front passenger side right below where the head is bolted, there is a flange with the engine ID numbers unless the block has been milled. You can either post them here or look them up on this wesite. Chevy Casting Number identification - Block casting numbers BTW the heads also have casting numbers under the valve covers.
01-08-2013 07:07 PM
BOBCRMAN@aol.com 350 horse. Q-jet carb, oval port heads, cast pistons, hyd lifters.

375 horse Holley carb, aluminum intake, rectangle ports, forged pistons. solid lifters.
01-08-2013 06:56 PM
poncho62 I used to know this stuff....The 350hp 396 had oval port heads, cast pistons, cast crank...The 375hp one had the larger square port heads, forged pistons and crank...solid lifter cam


Best bet is to check the suffix numbers
01-08-2013 06:55 PM
RWENUTS The L34 (350 hp) had oval port heads.
L78 (375 hp) had square port heads.
01-08-2013 06:51 PM
davidhoward
396 350 375

how do i know if it is a 350 hp
or if it is a 375hp
396cu

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