'80 SA 5.0 Build - Page 5 - RX7Club.com - Mazda RX7 Forum

'80 SA 5.0 Build

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Old 09-05-17, 10:41 PM
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I'm definitely glad the V8 is sitting in the car. After sleeping on it I woke up this morning and realized how excited I was about it. After all, its these challenges to add to our pride when it runs.






Here are couple of photos I took when I originally beat the firewall back on the left side. I circled the area where I'm currently making contact. Lowering the right side is definitely the better solution. It will shift the contact point towards the radius that leads into the transmission tunnel and lower it some as well. It also shifts the exhaust manifold/header away from the steering box.

My idea on lowering the right side is to oval out the engine mounts them selves (where the cross pin connects the mounts to the brackets). I figure if screw the mount up it will be less expensive and easier to replace. Hopefully Sunday I will have time to play around with it.
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Old 09-11-17, 10:20 PM
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So I didnít really get to do much with the seven over the last week. I spent a few minutes looking at the mounting problem and found that my oil pan is sitting on the sub frame already. So shimming the engine up on the driver side will likely be my only choice. I also wonder how Iím going to fit the shifter in the car with the fact the transmission is already up against the floor boards. Iíll have to revisit that after the engine sits semi level.

I did spent some time yesterday going through the wiring. Iím very tempted to gut the RX-7 wiring in the engine bay. There are such few wires needed and where I need to make connections it would almost be easier just to run my own wires. I am hesitant, however, I donít want to over complicate things at this time. I just want to drive the damn car.



The transmission tilted and sitting against the floor board.
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Old 09-12-17, 08:48 AM
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I tucked the wiring harness on my car. I basically just have the headlight, marker light, turn signals, and marker lights left from the stock engine bay harness
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Old 09-13-17, 08:36 PM
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see that hump in the tunnel, i my case it hat to be cut off.
my headers hit it.
also i removed the 3 tubes and run new hose under the car
i'm glad to see your on the way to the road

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Old 09-16-17, 10:59 PM
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Today I partially pulled the engine out enough to recess the firewall some more. I got a good 3/16-1/4" out of it. I then moved to ovaling the right engine mount to drop the engine on the right side. I was planning on shimming the left side quite a bit, but when I set the engine in it fit a lot better. It now clears the firewall, and sits more level now. And somehow now clears the subframe, but barely, maybe a 1/8".

I put the upper intake on to see if it clears the hood, but it doesn't. I can shut the hood so it must be just right there.

So I'm not sure if I will leave it the way it is, or shim up the left a little more.

Im also thinking I'm going to have to go with the stock manifolds. There just doesn't seem to be anyway to make them fit. The #6 pipe where the CARB number is hits the steering box big time. The stock manifold clear it by over an inch.
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Old 09-16-17, 11:02 PM
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Old 09-18-17, 09:31 PM
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So in doing some research over the last few days I think I found a set of headers that will fit.

My V8 RX-7 Build Thread - Ford Mustang Forum

On a Mustang site I found someone who made the same mistake I did and purchased brand new headers from BBK only to have them not fit. Same problem, #6 tube hits the steering box.

He ultimately found that MAC headers #6 tube curves inwards and clears the box. So I'm searching Craigslist and EBay for set that's hopefully used. A new pair will cost over $200. Maybe I get lucky and someone will have a ceramic pair and will trade strait across.

How much do you think my BBK headers are worth now that I took them out of the box and played around with them?
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Old 09-18-17, 09:36 PM
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Originally Posted by GFRENCH View Post




see that hump in the tunnel, i my case it hat to be cut off.
my headers hit it.
also i removed the 3 tubes and run new hose under the car
i'm glad to see your on the way to the road
I did cut that hump off the tunnel (for the original cross member). I think in your case you used long tube headers, correct? There doesn't seem to be any emission legal long tubes on the market.

As for the fuel lines, I might have to do something about that because the stock manifolds hit them. That's an easy fix comparatively.
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Old 09-19-17, 05:50 PM
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I think in your case you used long tube headers, correct? There doesn't seem to be any emission legal long tubes on the market.

yes mine are a long tube with 2 1/2 collector.
this ended up pointing straight at that hump
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