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Hot Rods Heads to Block mismatch, do I need matched heads?

Discussion in 'The Hokey Ass Message Board' started by charlesmajor, Jun 2, 2021.

  1. charlesmajor
    Joined: Jan 15, 2010
    Posts: 27

    charlesmajor
    Member
    from tx

    I have 390 (Cadillac) that I found out today has 365 Heads. Is this mismatch a problem? I know the 390 heads would be better breathing and would help out a 365 block, but am I hurting compression and power by running the smaller heads? This is a 1957 Cadillac Limo- not doing any racing so 5HP here or there is not a deal breaker.
    Thanks!
    Charles in Dallas
     

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