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bolts to pipes on BB HP exhaust manifold #249342 03/10/09 10:30 AM 03/10/09 10:30 AM
Joined: Aug 2007 Posts: 6,100 Valencia, España NachoRT74 OP master
NachoRT74 OP master Joined: Aug 2007 Posts: 6,100 Valencia, España	what's the correct bolt size to join exhaust manifold to pipes ? head, bolt lenght and diameter, and thread. With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: bolts to pipes on BB HP exhaust manifold [Re: NachoRT74] #249343 03/10/09 10:46 AM 03/10/09 10:46 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: what's the correct bolt size to join exhaust manifold to pipes ? head, bolt lenght and diameter, and thread. (1) 9/16(pretty sure) (2) dont know (3) 3/8" (4) 16 tpi(coarse) live every 24 hour block of time like it's your last day on earth

Re: bolts to pipes on BB HP exhaust manifold [Re: RapidRobert] #249344 03/10/09 11:26 AM 03/10/09 11:26 AM
Joined: Aug 2007 Posts: 6,100 Valencia, España NachoRT74 OP master
NachoRT74 OP master Joined: Aug 2007 Posts: 6,100 Valencia, España	wow!!! 3/8 diameter 9/16 head ? I have actually 11/16 bolt head mounted on ? dunno the diameter, I'm not good on that, but bolt allmost fill completelly the exhaust hole. that would left LOT OF ROOM between hole and bolt!!! I guess grade 8 ? With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: bolts to pipes on BB HP exhaust manifold [Re: NachoRT74] #249345 03/10/09 11:40 AM 03/10/09 11:40 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: I'm not good on that, but bolt allmost fill completelly the exhaust hole. Yes that's what you want a large a diameter as will fit in there. I was thinking that the last one I was on was a 3/8" shank with a 9/16" head. If you're buying new bolts I think grade 5 would be adequate(cheaper) if you didn't have some grade 8 ones in your parts stash. live every 24 hour block of time like it's your last day on earth

Re: bolts to pipes on BB HP exhaust manifold [Re: RapidRobert] #249346 03/10/09 12:26 PM 03/10/09 12:26 PM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	Also go with grade 8's and use some anti-seize on the threads as I think the torque on those is around 50 ftlbs.

Re: bolts to pipes on BB HP exhaust manifold [Re: Classof70Chally] #249347 03/10/09 01:15 PM 03/10/09 01:15 PM
Joined: Aug 2007 Posts: 6,100 Valencia, España NachoRT74 OP master
NachoRT74 OP master Joined: Aug 2007 Posts: 6,100 Valencia, España	the problem is 11/16 bolt heads dosn't allow to fit the wrench ( with closed side of wrench ) on top to hold the screw for a while you are tighten the nut. maybe if I get 5/8" head bolt will be in the middle of the line ? I wanted to get filled the hole to a propper aligment of pieces, but!!! Or maybe grade 8 fine thread ( I think mines are larger thread ) will get less damage on head with holding with open side of wrench with 11/16 head ? The advantage on use the closed side of wrench, is they hold by themself on place for a while I tight the nut. With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: bolts to pipes on BB HP exhaust manifold [Re: NachoRT74] #249348 03/10/09 01:44 PM 03/10/09 01:44 PM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	On my manifolds on the drivers side I had to grind down about 90' worth of bolt head so they could be put into the manifold flange due to the tight clearance. They tighten just fine however.

Re: bolts to pipes on BB HP exhaust manifold [Re: Classof70Chally] #249349 03/10/09 09:58 PM 03/10/09 09:58 PM
Joined: Jun 2004 Posts: 3,319 Chicago Burbs sthemi master
sthemi master Joined: Jun 2004 Posts: 3,319 Chicago Burbs	I just did this fight last summer, I had 3/8 dia bolts in it and it leaked..so, I replaced them with 7/16th bolts.. But in reality the true problem was one of the pipes was not bent correctly and was hitting the torsion bar or bellhousing causing the misalignment. I had to have new pipes made to correct the problem. I used gr 8 bolts and nuts.. Video Little Red Wagon Indy Nats,BurnoutContest

Re: bolts to pipes on BB HP exhaust manifold [Re: RapidRobert] #249350 03/11/09 09:45 AM 03/11/09 09:45 AM
Joined: Jan 2003 Posts: 75,125 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,125 A Banana Republic near you.	Quote: Quote: what's the correct bolt size to join exhaust manifold to pipes ? head, bolt lenght and diameter, and thread. (1) 9/16(pretty sure) (2) dont know (3) 3/8" (4) 16 tpi(coarse) Incorrect, the CORRECT size for BIG BLOCK exh manifold to fipe is a 7/16-14 bolt . as far as asking the bolt head size ??? The only come one way , the nuts though can be either 5/8 or 11/16"

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