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Obsidian/Personal/Z/Z31 LS Swap.md

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Cyurrent Status (February 24, 2025)

The old VG30e engine is out of the z, along with the transmission and 3/4 of the exhaust. Right now, i have the new engine mounts, and that's about it. This swap will be a big deal for this car, and hopefully it won't take too long to really get done. First, let's outline the goals and scope of this build.

Goals

  1. Get a Gen III or Gen IV small block Chevy engine in the Z's chassis, prefferably a 5.3L or even 4.8L. No need to over do power. This engine will be sourced from a junkyard.
  2. Find a matching transmission to pair with the LS engine
  3. Reuse stock differential and rear end. Custom driveshaft will be required
  4. Keep current electrical harness for car cabin
  5. Get working gauges in stock gauge cluster

In Scope

A reliable junkyard LS engine will make the new heartbeat of this car.This engine will come from a Chevy truck from the Pittsburgh UPullNPay, as this will by far be the cheapest option. This engine will be paired with likely a TKX transmission and bellhousing. At the moment of writing this, I think an aftermarket ECU and harness might be the way to go.

Other critical supporting systems will also come up. Exhaust, cooling, and electrical just to name a few.

Out of Scope

Any fancy turbo business.

What Needs Done

Planning

Work on the car

  • Clean up the engine bay. Remove junk that doesn't need to be there. #Powertrain #Hands-On #Running-Car ✅ 2025-03-10
  • [/] Sell the old engine #Hands-On 📅 2025-04-01
  • [/] Sell the old transmission #Hands-On 📅 2025-04-01

Projected Costs

Page Name Updated Date Projected Cost Realized Cost
Which LS Engine should I target? 3/7 $893
What transmission will solve all my problems? 3/7 $1741 (Ebay trans)
How will cooling work?
How will fuel work?
How will the exhaust work?
How will gauges work?
GRAND TOTAL: 3/7 $2636
JE