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280z motor in a 240z?


doc76239

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If it runs decent, the title is clean, and it can be easily registered than you cannot go wrong with a running 240Z for $700.

Typically the first thing you want to look at on a 240Z is body and chassis rust. Check under the interior carpets, under the battery, bottom of front fenders, rear hatch ledge, around the seam under the doors and in the spare tire well. You can spend a lot of time and money fixing rust if you end up wanting to make the car a keeper. Interior parts can also be hard/expensive to come by.

Hope it helps!

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It sounds like a good deal to me, even better if it had the old original matching engine. One note is that with the frame modifications it may not meet the specifications for certain organized racing/autocross classes. But for that money it would be fine for driving down the street! :)

If you don't buy it post the contact info here and I am sure it will find a good home!

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The original motor is gone, it blew a rod threw block. The 280z motor is know as what engine designation? Would this be L86. Also the 280z motor in the 240z has the twin carbs, not fuel injection. How hard is it to dial these carbs in. This is the reason the car runs rough.Are there any headers that would fit the 280z motor in the 240z car. Supposidly the car carves corners really well because of the chassy reinforcements and having been lowered.

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There are two things that distinguish the motor. First is its model number and second its casting number.

The model number is on the driver’s right, rear side of the block and is the beginning of the engine serial number (ex. L28-XXXXXX). The model numbers follow the displacement- L28 is the approx. 2800cc motor for the 280Z & 280ZX, L26 is approx. 2600cc for the 260Z, etc...

The casting number is on the driver’s right side of the engine near the bottom just behind the motor mount. The key here is with respect to the L28. There were two different cast L28 blocks available by Datsun/Nissan. The N42 in the 280Z & '79 280ZX and the later F54 in the '80-'83 280ZX. The three important things to remember is that either block will bolt to any "L" series motor head (but may have different compression ratios), the F54 is considered to be stronger due extra strengthening between the cylinders, and the non-Turbo motors had flattop pistons that when used with early '70-'78 Z cylinder head can produce compression ratios of 9.5+. Higher compression ratio engines are much more productive (can make more power) with wilder cams and larger valves. Yours may very well be a N42 block, which isn't a problem but the F54 is often preferred.

Regarding carbs, a set of SU's in good condition can be very easy to dial in. But you will need to take some time and learn how to do it and what problems to look for. Check out www.ztherapy.com, they rebuild the Z SU's and sell very detailed instructional videos that will give you the knowledge you seek!

Hope it makes sense! Have fun!

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