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720 engine swap options


Ole Blue

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New to the forum but not new to Datsun's. Had a 510 since I was 12. Owned 3 510's, two 720's and a sentra here and there. Just picked up a 85 720 with a blown Z24 for my son. Not sure what happened, we'll know as soon as we crack it open. My question to the forum is what are my options out there for a torquey motor for this truck that doesn't use the z head and bolts up to the 5 sp already in there? KA maybe? z24 block with a L-series head? It's a two wheel drive LB King Cab 5 sp. What say you all?? My son will use this as a daily driver (40 miles a day) but we're looking for a good torquey option that will be reliable to haul and tow here and there. Thanks!! Considering all options. Let's hear it.

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Well if you want reliable, a ka would be a better option than the LZ hybrid because of the fuel injection. An L head will bolt to the z24 block, but you need to modify the timing cover and make your own gasket. A ka will also bolt right up to the 720 trans, you'll just have to deal with wiring, or convert it to run a carb.

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Likely a blown head gasket, a common thing on Z24 when they reach 100K. Fix it for under $50 and run with it. Nothing wrong with the Z 24, it makes 130 torque at 2800 a real stump puller for a heavy 720.

 

An L head will fit but you would also need the manifolds which when installed on a left leaning Z series engine will be tilted down towards  the steering column.... might fit but carb won't be level at all. The fix is to replace the Z series transmission with a matching L series and get L series engine brackets that will allow the engine to be tilted over to the right in the L series position. Timing cover needs to be from an L20B and 2 cm taller with the timing chain lengthened to fit. Compression would be 10 to one.... a bit high.

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Do you hate NapZ ? Or just don't know where parts are??  Emerys auto wrecking ,, over by Aberdeen auto wreckers had a few Napz 24s that turned over by hand in trucks out back. and a pretty nice head in the counter area, when we were there  6 months or so ago ..  I assume that kinda thing doesn't sell real fast,, maybe i'm wrong.

 

Bill out in Elma might be able to put you something together for a reasonable price,, if your block is still good and just hate Napz head on it.

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Don't hate the head, just never liked the twin plug design. Bill and I go way back. We've already talked about options. I've rebuilt a few, just wanted to try something different this time.

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What do you guys think about a KA24 with a turbo on it? What year and out of what can I find the best fit for this truck? 240SX? How much trouble is the swap? Just keeping my options open. Pulled the motor today. Teardown starting this week.

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240sx fuel injection is the easiest to use. The engine bay harness is separate from the rest of the car harness and its multi point fuel injection. Truck stuff is built into one large harness and is throttle body until the very late 90s.

 

240 is front sump, truck is rear. Truck pan will not fit 240sx block because 240sx has a girdle on the main caps.

 

Best bet is likely 240sx intake manifold and fuel system, wiring and ecu attached to a truck block.

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Likely the torsion bars up front have gotten a little slack. Tighten them up and level the truck if you want, but the 2wd had a rake from the factory I believe.

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All 521/620/720 trucks have a slight 'rake'. This allows a load to settle the truck and the NLSV will adjust the brake bias properly. If you don't carry a load regularly then level it to suit your taste.

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