What size are the exhaust manifold bolts?

Codeman · July 13th, 2011, 02:36 PM

I got some LTs I am going to be installing bought them used. Well Ford wants $7 a piece for the studs. I am curious to what size and pitch? I am guessing like an m8 1.25? Anyone know for sure? I work for a chevy dealer and can get parts at cost and if I know the size I can have them just order normal exhaust bolts that will work except for less money.

ESG-642T · July 13th, 2011, 02:59 PM

m8x1.25 seems correct but its been a while...... And yes get the bolts don't mess with those studs.

walt1120 · July 13th, 2011, 03:05 PM

The guy who assembled my heads said that some of the studs got stuck in the old heads (he damaged the threads removing them) so he just used regular hex screw and bolt instead of studs.

We used 8mmx1.25x40mm bolts.

Of course id recommend using studs but at the time i didnt care.

Codeman · July 13th, 2011, 04:27 PM

Ok thanks. I am planning on using bolts. IDK why ford put the studs on unless one of their other vehicles that used the 3.8 had a heat sheild on the manifolds. Kind of dumb in my eyes.

Thanks for the help.

Can't wait to get the LTs on I next need some cutouts so I might have to order some before I put them on so I can do it all at once. Not electric though too expensive maybe down the road though.

July 13th, 2011, 02:36 PM	#1
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	What size are the exhaust manifold bolts? I got some LTs I am going to be installing bought them used. Well Ford wants $7 a piece for the studs. I am curious to what size and pitch? I am guessing like an m8 1.25? Anyone know for sure? I work for a chevy dealer and can get parts at cost and if I know the size I can have them just order normal exhaust bolts that will work except for less money. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

July 13th, 2011, 02:59 PM	#2
ESG-642T [8MINUS2] 2002, Ford, v6 Join Date: Feb 2007 Location: TEXAS Posts: 12,319 iTrader: 0 reviews	m8x1.25 seems correct but its been a while...... And yes get the bolts don't mess with those studs. __________________ Hi, You can call me Kyle Random ESG fact: Had a prochamber on his v6 before it was popular. WTB: v6 BBK valve covers

July 13th, 2011, 03:05 PM	#3
walt1120 Hardcore Enthusiast 04 Stang 1.0Gallon V6 14.45 @95.8 Join Date: Mar 2010 Location: South Jersey Posts: 2,130 iTrader: 2 reviews	The guy who assembled my heads said that some of the studs got stuck in the old heads (he damaged the threads removing them) so he just used regular hex screw and bolt instead of studs. We used 8mmx1.25x40mm bolts. Of course id recommend using studs but at the time i didnt care. __________________ 2004 Bolt on & Cammed 3.9L V6

July 13th, 2011, 04:27 PM	#4
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	Ok thanks. I am planning on using bolts. IDK why ford put the studs on unless one of their other vehicles that used the 3.8 had a heat sheild on the manifolds. Kind of dumb in my eyes. Thanks for the help. Can't wait to get the LTs on I next need some cutouts so I might have to order some before I put them on so I can do it all at once. Not electric though too expensive maybe down the road though. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

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