Exhaust Mani bolts

TheReelMuhcoy

New member
Joined
Jul 24, 2012
Messages
567
Reaction score
0
Location
New Jersey
Anyone ever use other than factory bolts for the exhaust manifold? I was thinking of getting some grade 8 stainless bolts. I also just found BPD's titanium bolts. Thoughts?
 

MrOneEyedBoh

Member
Joined
Feb 24, 2013
Messages
799
Reaction score
0
I'm getting work done to my truck. When they have the manifolds off, I'm getting them to replace them with ARP flange head bolts in SS. Some say its overkill, but USA made fasteners are far superior to import fasteners. The thread is m8x1.25x50mm. I also bought m8 flat washers.

While you have them off, coat them in a copper anti-seize and torque to 24 ft#. Also, I'd go 6pt vs 12pt, just so you get a bit more bite on each flat of the bolt head.

Buy from Allen's Fasteners, as they allow you to buy per bolt and washer. ARP usually sells them in packages of 5 I believe, so buying solo allows you to get the 16 you need, and not have any extra.
 

strokin6L

Active member
Joined
May 23, 2011
Messages
2,979
Reaction score
0
Location
Springville NY
How do you like the BD manifolds? Any difference in EGT's?

Manifolds are nice...I had them ceramic coated. The truck barks a lot louder from about 40% throttle on up. I also changed turbo at same time...so hard to tell. Right now I have a worn out converter...and trucks seems to lug a lot more and be less responsive because of it.
 

Navigator

New member
Joined
May 21, 2014
Messages
31
Reaction score
0
Location
Ashland, WI
I think these are 5mm longer than the factory bolts?

ARP.jpg
 

MrOneEyedBoh

Member
Joined
Feb 24, 2013
Messages
799
Reaction score
0
Yeah but 5mm lol that's like 3/16". Run a washer and you're damn close to OEM length. Plus the bolt doesn't bottom out in the hole, thus giving you a bit more depth to play with
 

MrOneEyedBoh

Member
Joined
Feb 24, 2013
Messages
799
Reaction score
0
edited: I see that I ordered the wrong ones.. tHe bolts are 48mm OAL and UHL ( under head length ) is 40mm. The ARPs are measured UHL, so I just bought some 40mm ones. They 50mm will work, but with a thicker washer.
 

Latest posts

Members online

Top