Mazda RX7 to Chevy V8 350 conversion

Putting V8s into little cars is fun. Driving them is funner. This project started out as a Gen2 RX7 with a blown engine. An engine and 700R4 automatic transmission from a 1988 Blazer provided the power.

The good thing about this combination is the fact the Rx7 is already rear wheel drive, has an adequate tunnel for the transmission, room under the hood for a V8, decent suspension and piston engines in RX7s piss off RX7 fanboys. As far as engine swaps go, this was not horribly difficult. The car started out with no dash, wires cut everywhere, interior was missing most of the plastic and cloth.

I happened to find a Turbo II version in the local pick-and-pull with a complete grey interior, LSD rear end and Tokicos already installed. I removed those and the rear hatch as mine was broken, the taillights, and used them in the project. I also bought a transmission-to-speedometer adapter elbow from an online seller that specializes in these types of swaps. I also had to pull a manual rack from another boneyard RX7 as I didn’t want to mess with the power steering pump. it also required a ‘short shaft’ water pump, a larger radiator and fan kit.

As far as custom fabrication, it really only needed a few things:

  • Motor mounts
  • Exhaust
  • Driveshaft made from RX7 and Blazer ‘ends’.
  • Shifter mounted for Blazer’s transmission
  • Transmission support cross member
  • Once the driveline was mounted, fired up and running and the exhaust was done, all the car really needed was some working gauges, (another trip to the boneyard for an instrument cluster that I sent off to be modified to show correct RPMs), basic interior controls and interior. I made a little switch panel to run the front blower heat/defrost, and a plain switch for the rear window defrost and wiper to go in the center console behind the shifter. I used a manual choke knob/cable to move the blend doors from defrost to vent and floor heat.

    Since there would be no climate control or radio, I cut out some little brushed stainless panels to mount gauges. I also had to cut a hole in the hood for the air filter, and a pep-boys stick-on hood scoop kept the rain out.

    Here’s how well the engine fit:


    The dash and interior installed:

    The additional gauges:

    • Air/Fuel
    • Trans Temp
    • Clock
    • Switches: Dash lights/Interior lights/gauge panel lights
    • Oil and Water temps
    • Switch: manual radiator fan power, blue indicator light so I don’t forget to turn it off.

    All in all it was a fun project, and it was a blast to drive. The sound of the V8 through that custom dual exhaust was great!

    I eventually sold it as I moved on to work on other projects.

    Be Sociable, Share!
    This entry was posted in Things That Go. Bookmark the permalink.

    8 Responses to Mazda RX7 to Chevy V8 350 conversion

    1. erik says:

      hi i have a 1986 rx7 and i just but a chevy 350 engine and i want to know what i need to do my swap and how much will it be to for the parts i need . also whats the best transmission i coulde go whit. please email me at jdm_ego01@yahoo.com

    2. admin says:

      If you have to ask… It’s probably going to be harder than you think. You need a transmission, probably a R700 for an auto is what I used. Fabricate motor mounts, a cross member for the transmission, convert from power to manual steering, fabricate exhaust, convert the speedo and tach to read the transmission correctly, remove the computer and use the computer for the motor you are using, if any. There are places that make some of these parts if you google around enough. There’s a place called “granny’s” if I recall correctly that has a lot of the parts for these kinds of swap if you want too checkbook it instead of making your own. I had to have them convert my tach but everything else I did myself. I also had to buy a right angle geared ratio changing adapter for the speedo connection to the transmission. I also used a plain off-the-shelf shifter from checker which worked fine for the automatic transmission.

    3. admin says:

      Oh, plus I had to have a driveline made.

    4. anthony says:

      Did you us the same rear end

    5. admin says:

      Yes, the rear end is 100% RX7. All that was needed were the two driveshafts. I had a driveline built that has a chevy tranny joint on the front and mazda joint on the rear.

    6. anthony says:

      Were to send the dash to get work with v8

    7. admin says:

      I worked pretty much right fromthis page. http://grannys.tripod.com/1C8instructions1.html

    8. admin says:

      I worked pretty much right from this page. http://grannys.tripod.com/2ndgeninstructions1.html

    Leave a Reply

    Your email address will not be published. Required fields are marked *

    You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>