Bolts for High Flow cats/test pipes

Sh0velMan · 06-11-2013, 12:26 PM

I could probably make a reasonable guess as to the size bolt needed to connect a HFC/TP to the stock headers, but does anyone know for sure what is needed?

Looking at doing an install for someone and the second-hand HFC's didn't come with hardware.

Thx!

L33T Z34 · 07-24-2013, 02:16 AM

What I use:

1) ARP SS bolt = 3/8-24, 1.5" length, 7/16" hex socket, (725-1500)
2) ARP SS washer = 7/16" ID, 13/16" OD, 1/8" thick (400-8509)
3) ARP SS nut = 3/8-24, 7/16" 12pt socket, (400-8302)
4) Vibrant performance custom 3-bolt gaskets = 2.5"
Torque to ~40 foot lbs on the bolt/nut w/anti-seize.

I only need four total, since the exhaust manifolds retain a stud. I just use the OEM nut (20602-41G0A) on that.

fuct · 07-24-2013, 08:42 AM

^^awesome

Sh0velMan · 07-24-2013, 09:05 AM

lol thanks, good to have this info on the forum for posterity.

I just got 3/8ths flange bolts and nuts from local hardware stores (took a lot of driving around). ARP is probably more than a little overkill haha.

06-11-2013, 12:26 PM	#1 (permalink)
Sh0velMan A True Z Fanatic Join Date: Jan 2012 Location: Dallas/Ft.Worth Posts: 3,349 Drives: Noisily. Rep Power: 20	Bolts for High Flow cats/test pipes I could probably make a reasonable guess as to the size bolt needed to connect a HFC/TP to the stock headers, but does anyone know for sure what is needed? Looking at doing an install for someone and the second-hand HFC's didn't come with hardware. Thx! __________________ Buy My Car! \| Build Thread

07-24-2013, 02:16 AM	#2 (permalink)
L33T Z34 Banned Join Date: Jun 2010 Location: Ahnald, MO Age: 46 Posts: 387 Drives: 09 K51 G C Bw/S 6MT Rep Power: 0	Test pipe hardware What I use: 1) ARP SS bolt = 3/8-24, 1.5" length, 7/16" hex socket, (725-1500) 2) ARP SS washer = 7/16" ID, 13/16" OD, 1/8" thick (400-8509) 3) ARP SS nut = 3/8-24, 7/16" 12pt socket, (400-8302) 4) Vibrant performance custom 3-bolt gaskets = 2.5" Torque to ~40 foot lbs on the bolt/nut w/anti-seize. I only need four total, since the exhaust manifolds retain a stud. I just use the OEM nut (20602-41G0A) on that. fuct, jae35 and dajw like this. Last edited by L33T Z34; 03-10-2014 at 11:41 AM.

07-24-2013, 09:05 AM	#4 (permalink)
Sh0velMan A True Z Fanatic Join Date: Jan 2012 Location: Dallas/Ft.Worth Posts: 3,349 Drives: Noisily. Rep Power: 20	lol thanks, good to have this info on the forum for posterity. I just got 3/8ths flange bolts and nuts from local hardware stores (took a lot of driving around). ARP is probably more than a little overkill haha. __________________ Buy My Car! \| Build Thread

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07-24-2013, 08:42 AM	#3 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 23	^^awesome