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L series into early 521


sdsurf

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Not hard, but you have to swap out both the engine and transmission as well as replacing all the motor mounts. I don't think the frame or body changed at all, save for minor differences like marker light placement. But, like I said, you have to weld in new motor mounts, so make sure to get an engine that has them... you may as well try to get a 5-speed transmission while you're at it. The only other thing is the differential gearing is so low... but, if that works for you then keep it.

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Pretty much the same as above: weld in some new mounts. Other than that, it's all details. There's a bunch of writeups floating around... check out dimequarterly for a writeup... it's under engine in the tech section, right at the top of the page. Other than that, there's a few folks on here doing them. Take a look at the projects page. The KA and the SR are fairly similar engines in terms of swapping them in, so most of the info you find on one will be applicable to the other.

 

The KA is a bigger engine than the J though, so you'll have to do some fab work... New motor/transmission mounts, modifying a crossmember, possibly cutting into the core support/firewall/transmission tunnel... you'll need to run an electric fuel pump and do all the wiring too.

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