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  1. M

    Cylinder Head language

    Hi all engine guys. I have recently changed my cylinder head on my OMC V8 5L small block 1988 The reason to this change was cylinder 7 who had a low compression (6.5bar) Cylinder 1-3-5 was (9.5-10 bar) Now can anyone help me to understand what the removed cylinder head are trying to tell me. By...
  2. M

    Omc cylinder head

    Can someone please help!!! I have to OMC cylinder heads on the table they should both be for a 5L omc small block 305 they both have the number stamped into them 14102187 but one have GM1 and the other one have GM2 stamped into it what is the diffrence on these head, will they both fit on my omc...
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