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Old 11-08-2017   #1
Ccmano
 
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Default Drilling a Fidanza

So I’m about to drill the pressure plate mounting screw holes deeper and tap for the longer bolts. Is there anything special about this process I need to know before I start?
H
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Old 11-08-2017   #2
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Default Re: Drilling a Fidanza

Be sure the drill bit you use does not cut back the existing threads and use a depth stop so all are the bore depths are uniform. Make first pass with a regular 3/8-16 starting tap then finish with a bottoming tap. Use aluminum thread cutting oil.


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Old 11-08-2017   #3
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Default Re: Drilling a Fidanza

You may also have to slightly countersink the bore entry with a 3/8” drill bit or end mill cutter to allow the bolt shank to seat deeper.


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Old 11-08-2017   #4
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Default Re: Drilling a Fidanza

And best to do these steps on a drill press.


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Old 11-08-2017   #5
A26B
 
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Default Re: Drilling a Fidanza

My Fidanza was drilled tap size, all the way through from Fidanza. All I had to do was run the tap through.
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Old 11-08-2017   #6
Ccmano
 
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Default Re: Drilling a Fidanza

Quote:
Originally Posted by A26B View Post
My Fidanza was drilled tap size, all the way through from Fidanza. All I had to do was run the tap through.
By “all the way through” do you mean the hole came through the back?

Good stuff, guys. Thanks
H
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90'ZR-1 #1461 Red/Black
Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold
08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold
05 C6 Z51 Red/Black Sold
90'ZR-1 #1723 Black/Gray Sold but not forgotten
91' Z51 L98 White Vert. My First, you always remember your first. Sold.
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Old 11-09-2017   #7
A26B
 
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Default Re: Drilling a Fidanza

Quote:
Originally Posted by Ccmano View Post
By “all the way through” do you mean the hole came through the back?

Good stuff, guys. Thanks
H
Yes, drill holes went all the way through the flywheel. It was only tapped deep enough for the standard bolts. All I has to do was start the tap into the existing threads and thread them deeper. My Fidanza was purchased in 2003. Looks like I got lucky....hope you are too.
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JERRYS LT5 GASKETS & PARTS
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1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc.
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Old 11-09-2017   #8
Ccmano
 
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Default Re: Drilling a Fidanza

Quote:
Originally Posted by A26B View Post
Yes, drill holes went all the way through the flywheel. It was only tapped deep enough for the standard bolts. All I has to do was start the tap into the existing threads and thread them deeper. My Fidanza was purchased in 2003. Looks like I got lucky....hope you are too.
Interesting... mine is not drilled all the way through. However the treads do go all the way to the bottom of the holes. Just not far enough for the longer bolts.
H
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90'ZR-1 #1461 Red/Black
Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold
08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold
05 C6 Z51 Red/Black Sold
90'ZR-1 #1723 Black/Gray Sold but not forgotten
91' Z51 L98 White Vert. My First, you always remember your first. Sold.
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Old 11-09-2017   #9
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Default Re: Drilling a Fidanza

Quote:
Originally Posted by Ccmano View Post
Interesting... mine is not drilled all the way through. However the treads do go all the way to the bottom of the holes. Just not far enough for the longer bolts.
H
Is there not a specialty bolt available that might make life wonderful? What is the actual depth of the holes?
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Old 11-09-2017   #10
Ccmano
 
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Default Re: Drilling a Fidanza

Quote:
Originally Posted by WVZR-1 View Post
Is there not a specialty bolt available that might make life wonderful? What is the actual depth of the holes?
Not that I am aware of, but I already found a set of the recommended SRP bolts. (Thanks to Jagdpanzer). If you do a search in the Tech section there is endless discussion of this over ther years. These (no longer available) SRP bolts are best solution. It should be noted that they are simply shortened versions of an existing ARP bolt. Why SRP didn’t make them just a bit shorter to fit the exiting hole, I can’t say. From what I can see the regular bolts utilize about 60% of the thread in the Fidanza. Utilizing all the thread would be sufficient. The difference between the SRP bolt length and the depth of the hole the Fidanza is only about .25 inches. I will check shortly. Shortening the bolts my actually be the most expeditious solution.
H
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90'ZR-1 #1461 Red/Black
Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold
08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold
05 C6 Z51 Red/Black Sold
90'ZR-1 #1723 Black/Gray Sold but not forgotten
91' Z51 L98 White Vert. My First, you always remember your first. Sold.
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