Drilling a Fidanza - ZR-1 Net Registry Forums

Ccmano · 11-08-2017

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

Jagdpanzer · 11-08-2017

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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Jagdpanzer · 11-08-2017

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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Jagdpanzer · 11-08-2017

And best to do these steps on a drill press.

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A26B · 11-08-2017

My Fidanza was drilled tap size, all the way through from Fidanza. All I had to do was run the tap through.

Ccmano · 11-08-2017

Quote:

Originally Posted by A26B

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

A26B · 11-08-2017

Quote:

Originally Posted by Ccmano

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.

Ccmano · 11-09-2017

Quote:

Originally Posted by A26B

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

WVZR-1 · 11-09-2017

Quote:

Originally Posted by Ccmano

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?

Ccmano · 11-09-2017

Quote:

Originally Posted by WVZR-1

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

11-08-2017	#1
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	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 __________________ 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.

11-08-2017	#2
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,655	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. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

11-08-2017	#3
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,655	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. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

11-08-2017	#4
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,655	Re: Drilling a Fidanza And best to do these steps on a drill press. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

11-08-2017	#5
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,385	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. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.