Small block chevy v8 swapped z3

Marquisz3

Regular Member
American Zeds
Joined
Aug 4, 2025
Points
23
Location
North Carolina
Model of Z
V8 roadster
I made a separate thread in performance but am going to try and update this in the ongoing weeks as i progress with the build and document the smaller portions in more depth on this post from start to finish ( project started when i acquired the engine and trans from a 1975 corvette July 8th)
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The engine and trans combo specifically being a bone stock Gen1 350 SBC and a TH400, out of a running driving car, needed some general TLC and cleanup with the only "issue" being an oil leak from the valve covers that being said i had the intention to do a complete refresh of the engine regardless

I started by separating the engine and trans and mounting it on the stand

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I started by removing the intake manifold to get an opportunity to clean the block, replace the intake manifold gasket and replace with a new Edelbrock performer manifold (regardless on opinions of better or worse intake and carb brands or setups the most important part to me is its what every local parts store has in stock




Absolute ton of carbon build up but after a bit of careful cleaning vacuuming etc. managed to get it sorted (unfortunately don't have an after photo)

proceeded to remove the oil pan in order to replace the oil pump as well as the oil pan gasket





went ahead and reattached the new intake manifold as well as the valve covers with new gaskets and some sealer on the edges of the manifold




quick respray of the oil pan and reinstall on the block with high temp satin engine enamel and reinstalled with a new gasket

skipped a few steps in the photos but used some brushes, and wire wheels with engine degreaser to clean up the block and used satin engine enamel for a solid respray


the old distributor had definitely seen better days so i replaced it with a new HEI style distributor with new wires and plugs




with everything now connected i connected my Edelbrock inline fuel pump, electric choke and distributor ignition to my small starter switch panel and was able to run it on the engine stand, motor ran very well and sounded healthy, also used this with a timing light on the balancer to set the timing with the distributor




Now that i know i have a known good engine ready to throw into the chassis it was time for phase 2, removal of the m44 and Getrag trans from the z3




With the engine and trans out of the car i took the opportunity to install my steering shaft from Sikky, this shaft is designed for an LS swap for more clearance but works exactly the same for my application


after doing this i heavily cleaned the bay and chassis with wire brushes, wire wheels and engine degreaser


throughout the week i started adapting the wiring to the stock interior of the car, i cut apart the center console leaving room for the radio and cut the back of the stock gauge cluster, fabricated a small metal plate to hold the gauges for the swap, painted it and adhered it to the setup leaving a semi stock look, keep in mind the upper switch panel was what was already wired to the engine on the stand, (please note there are some variations in later photos since then)


with a few of the little things done i was fortunate to have a few friends interested enough in the project to lend me some of their time,

I started by attaching the shifter linkage, and cable from my B&M Cable shifter to the th400, immediately after we took the engine off of its stand and muscled the transmission onto the engine preparing it for install


we proceeded to get it raised with the trans pointing in towards the tunnel and pushed the car into position


we lowered the engine and trans and pushed the car forward and repeated until it was in the car around where we wanted


lifted the trans with the jack to get the engine into position and to get it where it needed to be while i fabricated mounts for both


Cut the engine mounts to shape

'

welded them in and got it all properly mounted


got the interior wired up with the engine, attached the carburetor, entire engine is wired to the switch panel as well, was able to jump the fuse box to the battery panel allowing full control over the windows, seats, lights turn signals, radio, essentially every stock non engine or trans system in the car while being able to start and control the motor




began install on the B&M shifter and connected it to the trans, only thing left for that is to fabricate a small plastic plate to fill the gap between it and the console



well folks as of 08/05/2025 almost a month after the acquisition of the drivetrain and start of the project here we are


I took a small vacation from work with my accrued leave days this upcoming week to finish up a few tasks to get it roadworthy
primary of which and will all be updated as i go along on these threads

Volvo power steering pump install, cooling system install, run fuel lines from the fuel pump to the carburetor, custom driveshaft install (small note on the driveshaft I'm running a stealth swaps differential adapter to a 1310 driveshaft as well as a 1310 slip yolk on the th400 so it will be a very simple and common shaft just a specific length 1310 to 1310) as well as undeniably one of the most important, subframe reinforcement so i don't rip my rear end in half, that being said I'm not necessarily doing a copy of the Randy Forbes on how he reinforced his setup it will have plenty of similarities but i intend to run 1 inch bar from where the diff mounts up the trunk and tie it into the sides of the trunk for rigidity
 

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Marquisz3

Regular Member
American Zeds
Joined
Aug 4, 2025
Points
23
Location
North Carolina
Model of Z
V8 roadster
was limited to 25 images so ended up trimming a few if you have any questions regarding rough pricing of it all, general setup, issues ideas etc. feel free to reach out
 

Delk

Zorg Guru (III)
British Zeds
Joined
Oct 9, 2018
Points
125
Location
Hemsby Norfolk
Model of Z
Z3 3.0T
Have you fitted any additonal gussets or supports where you tied the engine mounts to the chassis rails? The stock engine mounts sit on the subframe. I had to notch my chassis rail and box it in to make clearnance because I am running a mid mount turbo where the AC compressor would fit. The rails are fabricated from pretty thin sheet metal.
 

Marquisz3

Regular Member
American Zeds
Joined
Aug 4, 2025
Points
23
Location
North Carolina
Model of Z
V8 roadster
Have you fitted any additonal gussets or supports where you tied the engine mounts to the chassis rails? The stock engine mounts sit on the subframe. I had to notch my chassis rail and box it in to make clearnance because I am running a mid mount turbo where the AC compressor would fit. The rails are fabricated from pretty thin sheet metal.
I intend to add reinforcement to it when I reinforce the rear subframe, there was plenty of penetration in the welds so I imagine it should hold solid especially with how the trans is mounted, I actually didn’t have to do any clearancing whatsoever in order to get this to fit
 

Nodzed

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M Power
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Feb 18, 2016
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231
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Forest of Dean, Gloucestershire, England
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Z3M Imola and Z4 (e89)
:oops: WoW. Thats some work. Impressive. :thumbsup:
 

Marquisz3

Regular Member
American Zeds
Joined
Aug 4, 2025
Points
23
Location
North Carolina
Model of Z
V8 roadster
Brief update, managed to hit a TON of small wickets over the past two days first off being yesterdays project

installed a Volvo electric power steering up to the stock lines and got it working after wiring it up and welding and painting mounts to the chassis
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wired it up to the ignition, ran it for about 30 minutes for testing and had no issues, no leaks and made sure the lines and system were full

As for today the main goals were to get the cooling system (radiator/fan) and trans cooler set up with the front end on so I started by welding a bit on to the stock front member and hitting it with some paint
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added a second small tab to the frame to make it more of a “sliding” setup and just give a little more support as well as added foam padding to reduce vibration
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got to work attaching the radiator fan as well as mounting the oil cooler and running the oil cooler lines, I ended up tying them all together with the power steering lines and it came out fairly clean
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A few trips to autozone later and I ended up fining radiator hose that would work and got it mounted
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side not also hooked the brake boosters vacuum line up to the vacuum port on the back of the carburetor, all in all the front end is pretty much finished just waiting on my alternator bracket and in the meantime I’ll handle the fueling (pump and fuel cell are roughly mounted in the tank atm)
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just need to run the lines underneath the car and to the FPR

As well as the subframe reinforcement, diff adapter install and get the measurements for the actual driveshaft but all in all it’s 75 percent of the way there now
 

Delk

Zorg Guru (III)
British Zeds
Joined
Oct 9, 2018
Points
125
Location
Hemsby Norfolk
Model of Z
Z3 3.0T
Are you planning on running off the stock pump at some point? I see a small electric fuel pump. It wouldnt be hard to remove the stock in tank pump and bypass this with a piece of hose so you retained the orginal tank and fuel sender.
 

Marquisz3

Regular Member
American Zeds
Joined
Aug 4, 2025
Points
23
Location
North Carolina
Model of Z
V8 roadster
Are you planning on running off the stock pump at some point? I see a small electric fuel pump. It wouldnt be hard to remove the stock in tank pump and bypass this with a piece of hose so you retained the orginal tank and fuel sender.
There’s ways to do it they make fancy fuel pressure regulators that drop the fuel pressure from the level injectors need to the 5-7 psi a carb runs off of but I didn’t have any interest keeping the stick gauge given I made the custom setup for all the others and didn’t want gauges sticking out everywhere, that fuel cell does have a level sender and as far as the inline pump it’s more then enough given a carb runs around 5-7 psi, I just had no intention or real benefit keeping stock tank in my opinion at least for my benefit
 

Zephyr

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reading this post, all the potential that was released with this swap and the freedom to put whatever into whatever makes me wana shout God Bless America....
 

Marquisz3

Regular Member
American Zeds
Joined
Aug 4, 2025
Points
23
Location
North Carolina
Model of Z
V8 roadster
reading this post, all the potential that was released with this swap and the freedom to put whatever into whatever makes me wana shout God Bless America....
can’t be more patriotic then putting a 50 year old v8 in the least native platform for it that’s for sure
 

Mint

Zorg Expert (I)
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East Anglian Crew
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2.2 Sport Individual
What a fantastic project, this thread is a very enjoyable read, thank you:thumbsup:
 
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