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e_racer1999

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Posts posted by e_racer1999

  1. Welcome! I would like to start out by saying that I am in no way an expert on the 250 GTO conversion, but I may have some general advice and a couple questions. How comprehensive will the rebuild be? I would probably recommend you get a later 280Z for your donor. My reasoning is as follows: I am assuming that you are keeping the Northstar V8 fuel-injected, therefore I would sat go for the 280Z because that's less work you would need to do on the fuel system to get it compatible with the EFI. My other reason for recommending the 280 is because of availability and price. Since more 280Zs were made than any other S30, there will be more and they should be cheaper because they are not as highly sought after when compared to the 240 or 260. I say later because more people seem to go for the '75 because it is smog exempt (at least that's the situation in CA).

    Anyway, hope that helps!

  2. The Japanese knew the N42 was what to use for 20+ year before someone on these shores took the time to rediscover it.

     

    Normally anything less than 0.125" is considered too thin to be structurally sound, and you will want a liner in that case.

     

    Braap recalls the discussion correctly.

     

    BTW, the siamesing did not 'in turn' make the walls thinner. The casting was redesigned, with supposedly even cooling, the bores 'should' stay rounder, so the engineering rationale for the thicker walls of the N42 was no longer justified. The thicker walls of the N42 were used under the rationale that they needed all that extra beef to keep the bores round under extreme conditions.

     

    In practice, the differences in concetricity is dubious, and the thicker walls of the N42 still work as well as ever to keep the cylinders round.

     

    And as Bryan pointed out, some people don't run anti-freeze in their blocks (common in the 1960's when the L-Engine was designed) so thicker walls gives you 'corrosion capability'---unlike some of those F54 blocks that have paper thin walls due to corrosion pockets that have eaten away at the water jacket side of hte cylinders!

     

    I think Bryan even experienced this on the DETT build!

     

    No N42 came in the 260Z, the bore is 'not' 83mm because it came out of a 260Z. Look at the block serial number---the engine was replaced with an L28 some time ago.

     

    There is no 83mm bore N42 block. They are all L28 86mm bores.

    Thanks for the clarification, Tony.

  3. i got them used and refinished them. they're 15"s, they just look huge next to the 510 (plus they're in front of the wheels on the car). got 'em for $500 for all 4. this was the only set they had. check used JDM wheel places around you. there's one right by my house that has a lot of wats but they are all high positive offset; not suitable for Zs

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