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Thread: Z Head

  1. #1
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    Default Z Head

    I recently purchased a N-66 head from a Nissan/Datsun inventory liquidator on E-Bay.

    He says it is the equivalent to a 260Z head, and it is NOS. How could I go wrong.

    Have an F54 short block next to my tired 240Z in Scottsdale, maybe a quick cure?

    xstates@verizon.net

  2. #2
    zguitar71 zguitar71's Avatar
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    N-66??????
    Did I hit that cone?
    1/71 series II 240z, 920 gold (AKA baby poo yellow, but I love it anyway)
    Christopher Gray

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    Quote Originally Posted by zguitar71
    N-66??????
    I was waiting for that response.

    I've never heard of such a head. How about some pictures of said beasty.

    Chris A.
    1973 240Z HLS30-156693

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    I've never heard of it either. I wonder what it's really from? A later Maxima perhaps, although I thought they used modified versions of the N42 & N47.
    =Enigma=
    CZCC#9360
    4/73 - HLS30-156236

    My name is Adam and I'm a Zeeoholic!

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    Default Z head

    N-33 looks similar to an E-31 laying around except ports might be a few thousandths larger.

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    Default Z head

    N-33 and NOS - jpegs
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    Default Z head

    E-31 comparison
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    Default Z head

    More #'s on the E-31
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    Default Z Head

    started FAST, died slowly???????????????

    Any answers?

    Probably cc it and measure ports and seats, an an AB test to the lowly E-31.

    Actually looks to be exactly what the Dealer said it was. He said many E-Bayer's said no such number.

    So much for E-Bay experts. I'm biased, many of the E-Bayers who follow Z's and 24/7: beat-up Sellers and never bid. They are "bottom feeders" as aptly written by a member at this site.

    Next step some Manley SS valves, and Comp Cam kit, have the RB cam, and F-54 short block for a relatively complete engine.

  10. #10
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    Quote Originally Posted by RickX
    Any answers?
    Ummm....you said you bought a N66 head. But you posted pics of N33 and E31. Where's the pics of the N66?

    This is the best I can do for you....

    BORE AND STROKE COMBINATIONS FOR L ENGINES HEAD # VOL. C.C. INT VALV. EX VALV. EXH. PORT PROD. DATE
    E31 42.4 42 33 square ex 10/69-7/71
    E88 44.7 42 33 square ex 9/71-7/72
    N33 47.8 42 33 square ex 8/72-7/73
    N33/P50 47.8 42 35 square ex 8/73-8/74
    N42 44.6 44 35 square ex 9/74-7/77
    N47 44.6 44 35 round ex 8/77-3/78
    P81 44.6 44 35 round ex 2/79-6/80
    P79 53.6 44 35 round ex 7/80-
    P90 53.6 44 35 square ex 12/80-7/82Turbo
    P99 53.6 44 35 square ex 8/82-Turbo Hyd

    Again, I find no N66 anywhere. And I've looked.



    Chris A.
    Last edited by ChrisA; 07-17-2006 at 08:45 AM.
    1973 240Z HLS30-156693

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    It is N-33, not the other. Intake on a 260Z head is bigger than a 280Z and some ZX's?

    Thanks for the info, should work well on a back-up engine and its NOS.

    On the E-31, are the centerlines closer on those small valves than the later heads with bigger valves?

    rick

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    Quote Originally Posted by RickX
    On the E-31, are the centerlines closer on those small valves than the later heads with bigger valves?

    rick
    Good question, I doubt it. It would screw up the location of the lobes on the cam I'd think. I dont have any heads off except a E31 right now or I'd check. I'd think the distance between the valve's OD is probably farther apart on a E31 than say a N47.

    Chris A.
    1973 240Z HLS30-156693

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    Chris, my mistake, cc's before valve diameters, misread it.

    seems like 280 valves are an easy swap? Does port flow/velocity suffer and become a top end engine like an L-88 vs oval port or 2.02 vs 1.94 on small blocks? Boss 302 is the all time worst.

    rick

  14. #14
    Supporting Member ChrisA's Avatar
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    Quote Originally Posted by RickX
    seems like 280 valves are an easy swap? Does port flow/velocity suffer
    rick
    Yes common swap on the small valve heads. Can't answer about the flow or velocity suffering though. Most folks who go the big valve swap also port and polish the intake manifolds as well. So that really changes the variables.

    Chris A.
    1973 240Z HLS30-156693

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