gt-40 head question

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  • newtoplanet
    • Jul 2012
    • 3

    • newtown ct

    • 1996 nautique closed bow 351 gt-40

    gt-40 head question

    I have a 1995 nautique, with a 351 gt-40,multi point fuel injection.I recently discovered the head is cracked.Now here's my question, if I found a gt-40 head with 1/2 inch head bolts,f3ze casting numbers,same size valves,brass freeze out plugs, 3 bar markings,gt markings etc would this be a direct replacement head for my application? or do i have to find out the cc's of this replacement head to insure same cyl pressure side to side Thank's
  • 2001SAN
    • Apr 2012
    • 203

    • Ireland

    • 2001 Super Air Nautique 210, 1989 Fairline Corniche 31

    #2
    I replaced the short block on my gt40 this season. used the gt40 heads and bought a standard 351w long block. Took the standard heads off and popped the gt40s on. Based on the research i did at the time as far as i can remember the gt40 heads should bolt straight onto any 351w block. i think a gt40 head is a gt40 head (not gt40p) and should be a straight swap. as long as the head bolt holes are 1/2" you should be fine. the only confusion or issue might be if it was a GT40P which would have 4 bars marked.

    by the way I am nooooo expert.

    best of luck!

    d.

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