Offenhauser intakes
Lead Driver
Joined: Mar 2008
Posts: 7,196
Likes: 387
From: Near Los Angeles
I use the Hedman and a DP. I have zero mounting issues. What troubles me is the heat from the header. On hot days the carb (new Summit 600) acts up and runs on, then won't start, despite having built/installed a heat shield. Also affected is mpg. A cool air intake is needed.
Oh, with that header your starter is now locked in place and can't be removed.
Use studs for the install, minimum 2" length,and crimp nuts, and Mr. Gasket #260, coating studs in head with copper anti seize. Torque to 1/2 what books says first time, moving from center out in counter-clockwise spiral, then go back and torque to spec. Run, let cool to touch, retorque, repeat one time and done forever. I used oem thick washers, and had to grind one side down because header flange and intake flange are diff. thicknesses.
Rather than spend $200+ on a thermal coating for the header, or spending countless hours dickering with thermal wrap for the heater, I'm going to EFI manies with dual 2.25 out.
Oh, with that header your starter is now locked in place and can't be removed.
Use studs for the install, minimum 2" length,and crimp nuts, and Mr. Gasket #260, coating studs in head with copper anti seize. Torque to 1/2 what books says first time, moving from center out in counter-clockwise spiral, then go back and torque to spec. Run, let cool to touch, retorque, repeat one time and done forever. I used oem thick washers, and had to grind one side down because header flange and intake flange are diff. thicknesses.
Rather than spend $200+ on a thermal coating for the header, or spending countless hours dickering with thermal wrap for the heater, I'm going to EFI manies with dual 2.25 out.
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
I use the Hedman and a DP. I have zero mounting issues. What troubles me is the heat from the header. On hot days the carb (new Summit 600) acts up and runs on, then won't start, despite having built/installed a heat shield. Also affected is mpg. A cool air intake is needed.
Oh, with that header your starter is now locked in place and can't be removed.
Use studs for the install, minimum 2" length,and crimp nuts, and Mr. Gasket #260, coating studs in head with copper anti seize. Torque to 1/2 what books says first time, moving from center out in counter-clockwise spiral, then go back and torque to spec. Run, let cool to touch, retorque, repeat one time and done forever. I used oem thick washers, and had to grind one side down because header flange and intake flange are diff. thicknesses.
Rather than spend $200+ on a thermal coating for the header, or spending countless hours dickering with thermal wrap for the heater, I'm going to EFI manies with dual 2.25 out.
Oh, with that header your starter is now locked in place and can't be removed.
Use studs for the install, minimum 2" length,and crimp nuts, and Mr. Gasket #260, coating studs in head with copper anti seize. Torque to 1/2 what books says first time, moving from center out in counter-clockwise spiral, then go back and torque to spec. Run, let cool to touch, retorque, repeat one time and done forever. I used oem thick washers, and had to grind one side down because header flange and intake flange are diff. thicknesses.
Rather than spend $200+ on a thermal coating for the header, or spending countless hours dickering with thermal wrap for the heater, I'm going to EFI manies with dual 2.25 out.
Lead Driver
Joined: Mar 2008
Posts: 7,196
Likes: 387
From: Near Los Angeles
Using a two in single out muffler is expensive, imo. I can get two turbo Summit single in/single out for $30 each. But I am still kicking around the idea because I would be a lot easier to go to a single 2.5 out. But... the 2.25" tail pipes are $15 each. The single 2.5" one costs $60. Apples and oranges.
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
Using a two in single out muffler is expensive, imo. I can get two turbo Summit single in/single out for $30 each. But I am still kicking around the idea because I would be a lot easier to go to a single 2.5 out. But... the 2.25" tail pipes are $15 each. The single 2.5" one costs $60. Apples and oranges.
I do want to add I miss my dual exhaust. The chrome tips just added the muscle truck look to it.
Posting Guru
Joined: Mar 2013
Posts: 1,294
Likes: 0
What do you guys recommend for headers to a single?
I have NO IDEA what I'm wanting this time but I'm not sure I like duals at all.
I want noise, but not a dual-rattle can sound.
I was thinking of a decent y pipe then a muffler, maybe, maybe a fat cat instead, and then 3" for a foot or two, it's just not worth running all the way to the back for me. Maybe a side exit? But probably not
I have NO IDEA what I'm wanting this time but I'm not sure I like duals at all.
I want noise, but not a dual-rattle can sound.
I was thinking of a decent y pipe then a muffler, maybe, maybe a fat cat instead, and then 3" for a foot or two, it's just not worth running all the way to the back for me. Maybe a side exit? But probably not
Thread Starter
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Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
top view
closer isometric view
Ok gents back on topic.....
After a quick check/test fit it does appear I'll have to trim abit for the header tube to clear as well as the intake. The intake looks like it just barely touches so it won't take too much.
Postmaster
Joined: Nov 2012
Posts: 2,806
Likes: 8
From: Langley, BC
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Thread Starter
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Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
well thanks
as for fancy...not so much....if I was to get fancy then I would have used a a 1/2" ball mill on the perimeter of the cavity, so it wouldn't have a square corners.
I did this on my time at work, on lunch and breaks...so.. not my mill either. Perks of when the boss goes on vacation
as for fancy...not so much....if I was to get fancy then I would have used a a 1/2" ball mill on the perimeter of the cavity, so it wouldn't have a square corners.
I did this on my time at work, on lunch and breaks...so.. not my mill either. Perks of when the boss goes on vacation
Thread Starter
|
Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
I use the Hedman and a DP. I have zero mounting issues. What troubles me is the heat from the header. On hot days the carb (new Summit 600) acts up and runs on, then won't start, despite having built/installed a heat shield. Also affected is mpg. A cool air intake is needed.
Oh, with that header your starter is now locked in place and can't be removed.
Use studs for the install, minimum 2" length,and crimp nuts, and Mr. Gasket #260, coating studs in head with copper anti seize. Torque to 1/2 what books says first time, moving from center out in counter-clockwise spiral, then go back and torque to spec. Run, let cool to touch, retorque, repeat one time and done forever. I used oem thick washers, and had to grind one side down because header flange and intake flange are diff. thicknesses.
Rather than spend $200+ on a thermal coating for the header, or spending countless hours dickering with thermal wrap for the heater, I'm going to EFI manies with dual 2.25 out.
Oh, with that header your starter is now locked in place and can't be removed.
Use studs for the install, minimum 2" length,and crimp nuts, and Mr. Gasket #260, coating studs in head with copper anti seize. Torque to 1/2 what books says first time, moving from center out in counter-clockwise spiral, then go back and torque to spec. Run, let cool to touch, retorque, repeat one time and done forever. I used oem thick washers, and had to grind one side down because header flange and intake flange are diff. thicknesses.
Rather than spend $200+ on a thermal coating for the header, or spending countless hours dickering with thermal wrap for the heater, I'm going to EFI manies with dual 2.25 out.
Its not that I don't believe you...I just need a better grasp of the whole deal.
Postmaster
Joined: Nov 2012
Posts: 2,806
Likes: 8
From: Langley, BC
well thanks
as for fancy...not so much....if I was to get fancy then I would have used a a 1/2" ball mill on the perimeter of the cavity, so it wouldn't have a square corners.
I did this on my time at work, on lunch and breaks...so.. not my mill either. Perks of when the boss goes on vacation
as for fancy...not so much....if I was to get fancy then I would have used a a 1/2" ball mill on the perimeter of the cavity, so it wouldn't have a square corners.
I did this on my time at work, on lunch and breaks...so.. not my mill either. Perks of when the boss goes on vacation
I've had thoughts of using a block like that but since I have a plate and it works I didn't bother.
Thread Starter
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Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
I see merit to using the thinner plate, with not getting so close to the exhaust and such...but was thinking that a bit more capacity might be helpful.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
Nice, with a block like that I'd figure a way to plumb up exhaust heat vs. cutting a heater hose. Maybe even take it a step further and combine with an EGR valve. Opens up lots of possibilities.
Threading the two bolt holes on the head side would give more clearance, at least it would with EFI manifolds.
Threading the two bolt holes on the head side would give more clearance, at least it would with EFI manifolds.
7th Gear
Joined: Jul 2021
Posts: 7
Likes: 0
Many have and it is considered a necessary modification to the intake.
Here's a thread about it. It's actually a sticky in this forum. Why your intake manifold requires heat.
Here's a thread about it. It's actually a sticky in this forum. Why your intake manifold requires heat.
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