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Old 03-31-2021, 07:02 AM   #1
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Just starting my LS v8 conversion

Now retired with the time to work on my 2003 Boxster S 3.2. Starting a LS swap. Got an adapter, flywheel and clutch on the shelf. Bought a junk yard L92 and have started prepping it for installation. Essentially turning it into an LS3. Ordered a LS3 intake, Saved the wiring harness and ECU for later. Deleting VVT and looking for the right cam. Need all the help I can get to get the balancer closer to the engine and find the right water manifold. It is going to be fun eventually cramming the LS into the Boxster. Others have done it so I am convinced I can.

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Old 04-01-2021, 05:02 AM   #2
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The truck balancer sticks out the most.

The next shortest is the 4th gen camaro and firebirds. The 5 th gen cars went to the truck spacing.

Next in line is the corvette version with matching water pump.

The absolutely shortest set up they ran was on the LS4. You will have to get the front of the crank shortened. The water pump is moved off center to get it super close.
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Old 04-02-2021, 02:20 PM   #3
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LS4 is the front pulley you want

Thats the V8 from the FWD cars. So its the shortest. You might be able to use a crank from an LS4 in just about any LS no machining required... but don't quote me there.


Gonna make your own engine cradle or buy a pre-fab one?


My buddy has a TB SS with a 6.0 in it. He went with a 216/218 cam... can't recall the lift, but it cranks out the power. Not much chop.

What heads are you gonna run? That should help you make your decision on what cam to get.


https://www.youtube.com/watch?v=JPAeepqrY-0

^^^^ the "Walter White" of cams for your entertainment.


YUS, more Chevy peoples
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Last edited by Qingdao; 04-02-2021 at 06:00 PM.
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Old 04-07-2021, 03:33 PM   #4
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Update...Sprucing up my Junk yard LS 6.2 L92. Deleting VVT and going with a comp thumper cam 54-600-11 219/233 Decided to use the corvette accessory spacing on the front of the engine. Planning for Earls remote water pump manifold up front. will find or make brackets for alternator and AC compressor low on each side. Will make my own engine frame/cradle. There is an Aussie on Youtube just made one for an Audi V8 going into his boxster. Will pattern mine very much like it. Oh, staying with the L92 heads with rectangle intakes. This L92 is just over 400 HP stock. I hope to make about 50 more HP with the cam.

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Old 04-07-2021, 05:59 PM   #5
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Update...Sprucing up my Junk yard LS 6.2 L92. Deleting VVT and going with a comp thumper cam 54-600-11 219/233 Decided to use the corvette accessory spacing on the front of the engine. Planning for Earls remote water pump manifold up front. will find or make brackets for alternator and AC compressor low on each side. Will make my own engine frame/cradle. There is an Aussie on Youtube just made one for an Audi V8 going into his boxster. Will pattern mine very much like it. Oh, staying with the L92 heads with rectangle intakes. This L92 is just over 400 HP stock. I hope to make about 50 more HP with the cam.
What's your plan for the transaxle? That's a lot of power to be putting through a 986, even the 6 speed. I'm super psyched to watch this go down though!

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Old 04-08-2021, 05:28 AM   #6
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Others have told me that the transaxle will be fine with a billet side cover. Actually I think the axles will be the weak link.
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Old 04-08-2021, 01:08 PM   #7
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Speaking of axles. You're gonna have issues with your rear swaybar links if you move your trans back. I had to add some spacing behind them to clear the axles.

How far has that aussi gotten? I haven't been watching too much of him.
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Old Yesterday, 05:47 PM   #8
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Ah, I saw the aussie's most recent video. He made his cradle much similar to how I made mine last year; except I added an extra support on either side that connects to the aluminum side braces. I didn't feel too confident in an engine supported by two points; IDK why I was so uneasy (Probably I woulda had more confidence if I had done an ounce of math, but I figured GO BIG NO MATHS NEEDED lol)






The Orange is the trans cradle I made out of the existing trans arm thingys.

In Yellow are the hockey pucks that the trans cradle rests on. There is an angle iron brace that runs down from the original mounting points and across. The hockey pucks and trans mounts rest on this solid cross member.

In blue is the additional bracing I put on just to supplement the old transmission "triangle"


I think you're gonna end up with something quite similar to this. I, at least, am not able to see another way of easily supporting the transmission... I guess you could go strait across the top and have the trans hang from some kind of mounts, but that seems kinda overly complex. Where hockey pucks are a tried and true method of supporting an engine.
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Old Today, 03:49 AM   #9
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in blue is the additional bracing I put on just to supplement the old transmission "triangle".
I have been thinking about ways to delete the sheet metal brace and you're the first person I've seen to do it. So you made a square from steel tubing and attached it at the rear and front? Sorry, the resolution on the pic is really crappy. What did you write there in blue?

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Old Today, 06:50 AM   #10
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Keep going with the pictures and solutions. I am taking all this in. Right now I am still fluffing up my engine. I have a point of no return when I start to tear up my perfectly good running boxster. My main objective right now is to keep my engine and accessories as short as possible. I started with a L92 with a lot out front. The water pump is going remote and a low mount alternator and corvette spacing is in the plans. All you others than have crammed this engine into your Boxsters give me hope that I can do it too.

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