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Thread: How to tell 390ci 300hp from 375hp
          
   
   

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  1. #11
    FFR428's Avatar
    FFR428 is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2004
    Location
    fairfield
    Car Year, Make, Model: 68 Cougar S code, 427 Tunnelport.
    Posts
    942

    Ed yes it will be above the casting number around the generator area. The HP letters are around 1/2" tall. Mike is correct though about the Z code 390. This would not be a HP block if original. The 390HP, 406 and early 427 blocks have this HP identfier. It's also on the rear of the block and inside by the cam bearing and main bearing areas. G.

    EDIT: Also the HP is cast in the lifter valley of the block.
    Last edited by FFR428; 05-22-2005 at 08:36 AM.

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