Best Manifold/Header Bolt Options. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

D-n-Tyke · 03-16-2022, 01:38 AM

Getting ready to pull my donor motor out (L59 5.3/4L60e out of 2003 Yukon XL). With everything I have read about the exhaust manifold bolts on these engines I want to replace them while the engine is out and they are easily accesable. What are the best aftermarket bokts to replace the junk stock ones with? I see so many out there? Are they all the same between all the LS motors? Or are the exhaust bolts in the LS1/LS3 different then the LM7 motors?

What do you guys suggest I go with for my motor (again L59(LM7) 5.3 out of a 2003 Yukon XL)

Joyridin · 03-16-2022, 07:45 AM

Just get eh ARP bolts if you can find them. You won't have any issues.

LS short box · 03-16-2022, 04:49 PM

Times 2 on the ARP bolts. All LS exhaust manifold bolts are the same as far as I know. Use some anti-seize on the bolts.

**Richard** · 03-17-2022, 12:16 AM

Have an ARP header fastener kit myself for the exhaust on my 6.2. Though it consists of studs and nuts. Cannot remember why I was persuaded to use the studs and nuts over bolts.

TrybalRage · 03-17-2022, 07:49 AM

I used ARP 134-1202 bolts on my LM7 swap. Got them from Summit Racing. They're good quality but they are a funky socket head (I needed to get a 12 point spline socket set from Harbor Freight), and they're already rusting a little even though they have a sort of black oxide coating on them.

OutlawDrifter · 03-17-2022, 04:58 PM

Use studs and anti-seize. I'm running ebay stainless sets on my '49 with manifolds, and my Z28 with headers.

D-n-Tyke · 03-17-2022, 06:54 PM

Quote:

Originally Posted by OutlawDrifter

Use studs and anti-seize. I'm running ebay stainless sets on my '49 with manifolds, and my Z28 with headers.

Studs and nuts I assume you mean? Why the suggestion of studs and nuts over bolts?

OutlawDrifter · 03-17-2022, 07:46 PM

Quote:

Originally Posted by D-n-Tyke

Studs and nuts I assume you mean? Why the suggestion of studs and nuts over bolts?

Studs and nuts, yes. But was suggesting using anti-sieze on the studs when they go in.

I've had better luck with them, the set on my Camaro has been there for 11+ years, tons of heat cycles, no problems, no broken bolt issues.

Joyridin · 03-18-2022, 08:10 AM

You can go to ICT Billet and grab a set also. The set i have from them uses a 7/16" wrench with metric threads. They are pretty decent quality and relatively cheap. They don't seem to rust either.

03-16-2022, 01:38 AM	#1
D-n-Tyke Registered User Join Date: Aug 2016 Location: El Cajon, CA Posts: 249	Best Manifold/Header Bolt Options. Getting ready to pull my donor motor out (L59 5.3/4L60e out of 2003 Yukon XL). With everything I have read about the exhaust manifold bolts on these engines I want to replace them while the engine is out and they are easily accesable. What are the best aftermarket bokts to replace the junk stock ones with? I see so many out there? Are they all the same between all the LS motors? Or are the exhaust bolts in the LS1/LS3 different then the LM7 motors? What do you guys suggest I go with for my motor (again L59(LM7) 5.3 out of a 2003 Yukon XL)

03-16-2022, 07:45 AM	#2
Joyridin Registered User Join Date: Sep 2020 Location: Cleveland, Ohio Posts: 486	Re: Best Manifold/Header Bolt Options. Just get eh ARP bolts if you can find them. You won't have any issues.

03-16-2022, 04:49 PM	#3
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,948	Re: Best Manifold/Header Bolt Options. Times 2 on the ARP bolts. All LS exhaust manifold bolts are the same as far as I know. Use some anti-seize on the bolts.

03-17-2022, 12:16 AM	#4
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,716	Re: Best Manifold/Header Bolt Options. Have an ARP header fastener kit myself for the exhaust on my 6.2. Though it consists of studs and nuts. Cannot remember why I was persuaded to use the studs and nuts over bolts. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

03-17-2022, 07:49 AM	#5
TrybalRage Registered User Join Date: Jun 2014 Location: Reading, PA Posts: 203	Re: Best Manifold/Header Bolt Options. I used ARP 134-1202 bolts on my LM7 swap. Got them from Summit Racing. They're good quality but they are a funky socket head (I needed to get a 12 point spline socket set from Harbor Freight), and they're already rusting a little even though they have a sort of black oxide coating on them. __________________ 1985 C10 Silverado LWB LS Swapped! Other Stuff 2010 Suburban 2500 LT 4WD

03-17-2022, 04:58 PM	#6
OutlawDrifter Registered User Join Date: Aug 2012 Location: Northeast KS Posts: 1,775	Re: Best Manifold/Header Bolt Options. Use studs and anti-seize. I'm running ebay stainless sets on my '49 with manifolds, and my Z28 with headers. __________________ 1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop

03-18-2022, 08:10 AM	#9
Joyridin Registered User Join Date: Sep 2020 Location: Cleveland, Ohio Posts: 486	Re: Best Manifold/Header Bolt Options. You can go to ICT Billet and grab a set also. The set i have from them uses a 7/16" wrench with metric threads. They are pretty decent quality and relatively cheap. They don't seem to rust either.



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