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  • JimNolan ·
    Dallas,
    I'm sorry for the time getting back to you but I just realized I had a private message. In answer to your question about 390/406. If you have a Z code car it's a 390. Mine was a Z code that I put a 406 in but didn't have a good block. I used a 390 block. The heads, intake, rods and crank are 406. The blocks are really hard to find. I'm running 10ci less than a 406 and I've got .9 less compression than a 406. Jim
    DallasGalaxie ·
    JimNolan, I noticed your signature says 390/406. I have a '63 boxtop with 406 flags. The original window sticker says 390 Police Interceptor. Is there a way to tell which I have? Thanks
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