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Old 04-04-18, 07:34 AM
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1jz

I have a 1978 Mazda rx7 and I’m looking to put a 1jz in for the heart , was wondering how how and much money it is compared to v8 swapping it ?
Old 04-04-18, 07:47 AM
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My gut feeling is that you'll spend more on the 1JZ. Only because V8's are everywhere. Does your 78 have a motor currently?
Old 04-04-18, 09:12 AM
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They will both cost you a good penny. My LS swap in the FD cost me around $11k and the 2JZ in my 4Runner ran me about $8k. Even cutting corners and buying used parts your looking at about $8k each.
Hope this helps and good luck with your build if you decide to pull the trigger
Old 04-05-18, 09:51 AM
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Before I started my ls swap I was wanting to do the 2j swap. After looking at prices of the 2j and 1j I decided I was gonna save money on going the ls route. If you want to go manual trans route I think the t-56 and r-154 are roughly the same price. I’d go with what you like best though. Looking back now I wish I went the jz route.
Old 04-09-18, 01:33 AM
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Originally Posted by GRMSLPR
My gut feeling is that you'll spend more on the 1JZ. Only because V8's are everywhere. Does your 78 have a motor currently?

It all depends on what HP level he wants but the costs can be made to where he can come out cheaper if he just wants a low HP car. All in all, i feel both V8 and 1jz route can get pretty pricey.
Old 04-09-18, 02:59 PM
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Swaps are pricey.

For both the LS and JZ route, the main issue is a good transmission. NA jz's and 4.8/5.3 LS motors are both easy to come by in the US, but a used T56 can almost never be found sub-$1000, and a rebuild can easily hit the $2000 mark. Your other options are a ~$3200 T56 magnum, a weak T5 from a Camaro, or adapting another tranmission wherein the price of adapters/flywheels can hit the $1000 mark. The same story stands for the JZ, the W54 is weak, and an R154 or adapted AR-5/CD009/etc gets expensive quick.

If you're ok with an automatic, the LS becomes a bit cheaper.
Old 04-09-18, 06:04 PM
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I've driven both. Imo is jz is the way to go. 8-10k sounds about right. They have kits out there to make the swap easier if you're not an experience welder.
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