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First turbo build, 70 GTO...

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Old 03-26-2023 | 12:17 PM
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Yesterday Vic finished the opening for the Holley ProDash.



The Vintage Air vents will be here tomorrow, courtesy of @Summitracing .

Andrew
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Old 03-27-2023 | 09:00 AM
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Looks great Andrew! Great idea on the heater core shut off valve.
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Old 04-06-2023 | 01:01 PM
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I am afraid that progress has slowed down a little. I am waiting on a local shop to get me in for the exhaust work and after that the car comes home.

In the meantime, the dash is done:



I may add a thin trim ring to the fuel level gauge, just to make it match the tach and speedo.

Andrew
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Old 04-07-2023 | 09:31 AM
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I forgot to mention, the little slot to the right of the steering column is getting one of these:

https://www.molex.com/molex/products...ors/0795405067

Andrew
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Old 04-13-2023 | 09:30 PM
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I went over to Vic's today and did a bunch of little projects to get it ready for a move to Hotrod Express to do the exhaust system. I cleaned the underside as best as I could, installed the gas tank, tidied up any loose wires, and packed up all of the left over parts to take home.

While I was doing all that, Vic tipped up a trim ring for the fuel level gauge:






Some people had expressed a concern for a lack of trim ring, so there it is...

Andrew
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Old 04-14-2023 | 03:43 PM
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The GTO took a ride to Hotrod Express this morning to have the exhaust system built.






To recap, the plan is to carry the single 4" from the downpipe, past the transmission crossmember. From there I have a Burns Stainless single 4" to dual 3" splitter, which then will feed into Dynomax UltraFlow Welded (PN 17547) large case mufflers and then tailpipes out the back with the OEM looking dual tips in the stock location. One of the 3" pipes will also have the exhaust valve installed before the muffler. This will allow me to effectively turn it into a single exhaust system for cruising on the highway. The exhaust valve will be controlled by the Holley Dominator ECU.

Andrew
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Old 04-20-2023 | 11:00 AM
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The GTO is at HotRod Express and they have been making some progress on the exhaust.



The ends of the tailpipes will also be modified to bring the stock looking tips through the cutouts in the rear valance panel.











There are going to be some issues with the tailpipes, which we anticipated. The the RideTech coilover is making the tailpipe fitment a little tricky. At this point it is clear that the front corners of the gas tank will need to be notched.

Andrew
Old 04-25-2023 | 12:50 PM
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Here are some more progress pictures from HotRod Express:





















Andrew
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Old 04-26-2023 | 09:19 PM
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More progress is being made on the exhaust:
























Andrew
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Old 04-27-2023 | 09:24 AM
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What's the actuator for on the passenger side pipe just past the transmission?
Old 04-27-2023 | 11:48 AM
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Originally Posted by The ******
What's the actuator for on the passenger side pipe just past the transmission?
It is one of these:


Andrew
Old 04-27-2023 | 12:12 PM
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Forgive me for asking but both pipes run through mufflers so what would be the purpose of having it?
Additional exhaust flow through two pipes instead of one?
Car looks amazing btw, really enjoyed following your build and am excited to hear it run.
Old 04-27-2023 | 12:30 PM
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Originally Posted by The ******
Forgive me for asking but both pipes run through mufflers so what would be the purpose of having it?
Additional exhaust flow through two pipes instead of one?
Car looks amazing btw, really enjoyed following your build and am excited to hear it run.
It is an experiment to see if shutting the valve will make it quieter with single exhaust.

Andrew
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Old 04-27-2023 | 02:22 PM
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Ahh okay, I'll be curious to see if it works.
@rotary1307cc employed this really cool noise cancelling pipe in his exhaust by taking the frequency of the sound and adding a dead-end pipe to the exhaust to cancel it out and he says it worked amazing.
Perhaps something to consider if a nice sound is what you're looking for.
I thought maybe you were doing a different muffler or maybe a straight pipe for that section for additional sound and flow.
Old 04-27-2023 | 02:26 PM
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Originally Posted by The ******
Ahh okay, I'll be curious to see if it works.
@rotary1307cc employed this really cool noise cancelling pipe in his exhaust by taking the frequency of the sound and adding a dead-end pipe to the exhaust to cancel it out and he says it worked amazing.
Perhaps something to consider if a nice sound is what you're looking for.
I thought maybe you were doing a different muffler or maybe a straight pipe for that section for additional sound and flow.
The dual 3" exhaust and those mufflers should flow very well, so I'm not worried about losing power when both pipes are flowing.

You're referring to a HelmHoltz resonator.

Andrew
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Old 04-28-2023 | 03:59 PM
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Josh at HotRod Express is doing a great job with this exhaust system.
















Andrew
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Old 05-01-2023 | 11:06 AM
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This morning I received more pictures of the exhaust from Friday. Looks like Josh is finish welding the exhaust...


















My friend Tom is coming for a visit for a few days on Wednesday and I hope the car can come home on Thursday or Friday.

Andrew
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Old 05-01-2023 | 03:01 PM
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Looks killer. So you are notching the gas tank?
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Old 05-01-2023 | 04:10 PM
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Originally Posted by Pro Stock John
Looks killer. So you are notching the gas tank?
Yes, just the lower corner, hopefully.

Andrew
Old 05-02-2023 | 11:05 AM
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Here are some more progress pictures of the exhaust. It looks like Josh has finished with the exhaust welding and is working on the lower, front corners of the gas tank.

























Andrew
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