Rebuilding the Eaton M90 Gen V Supercharger and Painting the Supercharger and valve covers (March 2020)

I had spent months scouring the internet looking at the best looking 3800sc engines. I definitely liked “Skitime’s” 3800sc engine and lots of the other stuff he did to his 1988 T-top GT. I wanted to look like his engine, but I also wanted to improve on the look and design, as well as incorporate everything else I saw and liked.

Skitimes 3800sc Engine and Decklid Window & Vent



I saw Skitimes build, and said that’s what I want my car to look like

So once I knew what I wanted to do to the supercharger, I set out to rebuild, machine down and smooth, and paint my M90 Gen V.



I used a pneumatic rotary tool to grind and sand down the rough casting of the supercharger

NOTE: DO NOT CLEAN THE SUPERCHARGER ROTOR!!! IT WILL REMOVE THE SPECIAL COATING!

I cleaned the supercharger inside and rotors with brake cleaner, and ruined the rotors by removing the special coating. Don’t clean the rotors, it was a huge mistake that I realized after.


Supercharger Rotors cleaned, but now ruined with black coating removed

Cleaned inside the supercharger

Once the supercharger was cleaned, and the rough casting smoothed out, I used automotive engine primer/filler to prepare the surface for paint. I primered, then sanded, then primered again. I used glaze and filler to fill in some of the pits in the aluminum.

Once the supercharger was smooth and I was happy with it, I activated my Red, Eastwood 2K Aerospray Urethane Ceramic Engine Paint. I wanted my engine to look great, and I knew using two-part Urethane paint would look 1000 times better then the cheap auto parts store spray-paint. The results from the Eastwood 2K Ceramic Engine Paint speak for themselves.


Painted with Eastwood’s 2K urethane ceramic engine paint ( https://amzn.to/3r2zc69 )






For the valve covers, I painted the aluminum color first, then masked the stripes, and painted the red. Once I removed the masking tape, I was left with the results above.





I reassembled the supercharger and added new AC Delco supercharger oil




I was very happy with the results! I let the paint cure fully for several days before I really handled it or added the silver pinstripes to the supercharger ribs. I handled the freshly painted parts with latex gloves, but the 2K paint felt dry to the touch after a couple hours.

I was able to purchase a “New Old Stock” supercharger rotor from ZZP that had the coating on it. The coating and the improved lower intake manifold are the reason the Gen V M90 makes 20 additional horsepower.




The 3800 seres III lower intake manifold from a L32 2005 Grand Prix GTP


ZZP Full Stack Intercooler for the Series III 3800sc




Test fitting the parts on the engine, and “Oh Man” does it look amazing. I’m so happy with the way the engine is going back together and its looking great.

[This message has been edited by VROOMZ28 (edited 09-30-2023).]

Welcome aboard!

I am enjoying your detailed description on your build and progress.

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