Fidanza Question - ZR-1 Net Registry Forums

Hammer · 05-02-2008

For those of you that have replaced your DM Flywheel with a Fidanza, I understand you need to replace the stock bolts with longer ones.

How much longer do they need to be? Stock ones are 7/16" x 20 x 2".

Also, where can a person purchase them and the pressure plate bolts?

Thanks

RHanselman · 05-02-2008

I cannot answer your questions but here's a link to the bolts.

http://www.zr1products.com/products.html

65ZR1 · 05-02-2008

You can use 3 packs of torque converter bolts from ARP. I think they are 7/16-20 by 1.25 long. The part number is 230-7303. This is for the flywheel to crank.

A26B · 05-02-2008

Quote:

Originally Posted by Hammer

For those of you that have replaced your DM Flywheel with a Fidanza, I understand you need to replace the stock bolts with longer ones.

How much longer do they need to be? Stock ones are 7/16" x 20 x 2".

Also, where can a person purchase them and the pressure plate bolts?

Thanks

The reference to "longer bolts" that you are probably referring to, actually refers to the pressure plate to flywheel bolts. It's not just longer, it has longer thread engagement in the flywheel but retains the same length of the 3/8" o.d. shank.

The longer thread engagement is a safety issue. Whereas the stock bolts engaged the cast iron material of the stock flywheel, the Fidanza is aluminum, which is significantly lower in yield. Bottom line...stock bolts, torqued to stock specifications are not engineered properly for use in aluminum.

Ron Woods sells a new bolt kit that includes the tap to run the threads through the Fidanza to accomodate longer thread engagement. Expensive, but darn well worth it if you consider the possibilites.

XfireZ51 · 05-02-2008

Just installed the Fidanza and that's exactly what I did. Got PP bolts from Ron and bought the ARP bolts for the crank. I sppoke to Haibeck about it and uses the stock bolts but for that extra bit of safety, I went the other way. The ARP bolts are actually for a Flexplate but work fine for the Fidanza.

05-02-2008	#1
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,652	Fidanza Question For those of you that have replaced your DM Flywheel with a Fidanza, I understand you need to replace the stock bolts with longer ones. How much longer do they need to be? Stock ones are 7/16" x 20 x 2". Also, where can a person purchase them and the pressure plate bolts? Thanks __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

05-02-2008	#2
RHanselman Join Date: Jul 2005 Location: Cresson, TX Posts: 970	Re: Fidanza Question I cannot answer your questions but here's a link to the bolts. http://www.zr1products.com/products.html __________________ Ron Hanselman Founding Member #80 CM Lifetime Member #1093 1991 #383 Twin Turbo 1993 #099 Ruby, Jeal 368 w/Snake Skinner body 1961 White with Red Int

05-02-2008	#3
65ZR1 Join Date: May 2006 Location: Canada Posts: 139	Re: Fidanza Question You can use 3 packs of torque converter bolts from ARP. I think they are 7/16-20 by 1.25 long. The part number is 230-7303. This is for the flywheel to crank.

05-02-2008	#5
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,706	Re: Fidanza Question Just installed the Fidanza and that's exactly what I did. Got PP bolts from Ron and bought the ARP bolts for the crank. I sppoke to Haibeck about it and uses the stock bolts but for that extra bit of safety, I went the other way. The ARP bolts are actually for a Flexplate but work fine for the Fidanza.