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TunnelArmr

Z31 sbc build thread

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So I had a 283 out of a 66 chevy and I decided I wanted to try putting in my z31. I wanted to keep it a manual transmission but I didnt have any gm transmissions that fit my budget for a 5 speed. I've always wanted to make a transmission adapter, how hard could it be? Just go for it see what happens. So I decided to use the fs5w71c that came in the car.

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I started off by going through the engine.20200212_112647.jpg.d961601d82edab80f6adc55d35ea2192.jpg

Started tearing down the engine for inspection. All looked good until...20200407_154226.jpg.8651ccba8b02db94172cb80886614015.jpg

Found a destroyed piston. This was kind of a bummer, luckily cylinder is fine. The other 7 pistons were undamaged. I the engine has been bored 040 over making it 288.8 ci, call it a 289 just to confuse the ford guys.20200412_164255.jpg.955def9ae5a168d4d267819d1f650a48.jpg

Well I had to wait for parts so I decided to give clean her up a bit.

 

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I started the conversion process with modified pilot bushing enlarged to fit the nissan input shaft. And then I just stuck them together for fun.(this is with no clutch/flywheel)20200414_224116.jpg.8913abf26b4710007af2f3dbf69a9653.jpg

The chevy flywheel is too big, a little grinding and it will fit no problem.

20200417_013301.jpg.b9ec114346f1d76691e295bb7d9fa994.jpg

Next I put on the clutch plate slid on the tranny and it wouldn't seat. Turns out the clutch was too tall and the throwout bearing retainer was too long. So after a full day of researching I found a flat diaphram clutch plate and a 350z bearing retainer which is shorter. Plenty of clearance.20200420_130236.jpg.77d740cc367145d9e7c308b449d4e8db.jpg

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Absolutely awesome work. That is certainly the crux of the gm v8 swaps. I spent more on my t5 setup than my engine rebuild and I know it is temporary while I keep adding to my T56 fund, waiting for the t5 to blow up. Interested to see the final results.

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20200506_172436.jpg.c21d8fcce14410e16a5197580794dbb7.jpgI bought these engine swap universal mounts they should work great, they come with plates that I will weld to the frame rails.20200506_182533.jpg.74c16cb51dee68c78e38a5fea6f31f03.jpghere is the transmission all bolted up.20200506_173245.jpg.6ff6a1353a3d7c3b667cd8304ffe5a5f.jpgI'm ready to put in the engine/trans. I just have to bolt up oem trans mount. Set the engine into position and weld up the engine mount plates.20200506_182541.jpg.49d032fee6cd853c1c8071d1b165b716.jpgI was lifting the engine and my 12 year old harbor freight hoist exploded guess I will have to wait to put it in. Ugh...

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I got the engine test fit.20200508_235818.jpg.d61af255345902af58059eaedebb9486.jpgplenty of clearance for distributor, steering shaft radiator, oil filter. Can definitely run some block hugger headers or maybe some mid length. The main problem now is the oil pan hits.20200509_181358.jpg.3cc765156b73780b5737db056e589bb9.jpgI cut out a piece then clean weld clean coat install.

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So I got some 1 3/4 long tube headers at a garage sale for $40. After trying to fit them it's obvious that they are hitting everywhere. 20200514_154900.jpg.0b587fc52c9de4752c73b476c9d3c904.jpgI debated on getting some shorty headers but that's too easy. So out came the sawzall and cutting discs. I had to cut all of this off to make them bolt up.20200514_153756.jpg.e90eeb68e778f4844f392ad68b455efc.jpgits going to be quite a challenge given the space limitations and the fact that I'm starting with basically half a header.

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Great build.  Impressed with your problem-solving solutions.  

I'm not in California.   Any concerns with smog inspections when the engine is older than the chassis?  Or are 35 year-olds exempt?

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