Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2018 Contributors:
StarDiero75, curts56, DannyG, B RON CO, wsa111, Captainslow42, falconcritter
Econoline, THE FRENCHTOWN FLYER, 95FordFleetside, turbo6, Max_Effort, WorldChampGramp
cr_bobcat, C.S.Designs, pmuller9, gus91326, rwbrooks50, rocklord, drag-200stang, Big64my79Effie, CNC-Dude, gb500

2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry

Unknown->> M.Ketterer, T.Smith, J.Myers, P.McIntire - Please PM me (1966Mustang) and lemme know who you are!

300 HD heavy duty exhaust manifold

Moderator: Mod Squad

User avatar
StrangeRanger
VIP Member
Posts: 5789
Joined: Fri Nov 08, 2002 5:54 pm
Location: Copley, OH

Re: 300 HD heavy duty exhaust manifold

Post #51 by StrangeRanger » Tue Apr 06, 2010 5:40 pm

Absolutely no hot side generated turbo lag on that setup. Given the proximity to the intake manifold there's not going to be much on the cold side either. I think I'd give up a little bit of theoretical peak power to get near zero lag any day of the week
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)

User avatar
crash-harris
Registered User
Posts: 711
Joined: Mon Mar 17, 2008 10:26 pm
Location: Chillicothe, OH & Hunting/B-ville, WV
Contact:

Re: 300 HD heavy duty exhaust manifold

Post #52 by crash-harris » Wed Apr 07, 2010 12:31 pm

Awesome! I had lost those pics! This is what I'm planning to do with my turbo setup, seems like the best way to go since I can't fab up turbo headers like some others on here can :wink:
Bruiser - 1990 Ford F150...barely...EFI 300 Big Six, 500K+!, converted to 4x4. 4.10 gears and Sterling FF rear w/ Trac-Lok, 37" meats. Undergoing 1 Ton leaf spring SAS. 6BT in the plans.

veritas82
New Member
Posts: 1
Joined: Tue Jun 25, 2013 2:49 pm

Re: 300 HD heavy duty exhaust manifold

Post #53 by veritas82 » Thu Jul 04, 2013 12:19 am

Hey fordsix, newbie here!

I'm going to revive this thread as I just haven't been able to dig up an answer with my "?" as of yet. I have a 1979 F150 300cid 4x4. I'm interested in hooking up an HD manifold for my rig and it seemed like a relatively doable swap upon seeing Econovan's application but upon speaking with a rep at stevens regarding their new HD manifold and to keep this short, he basically mentioned he gets over 50 percent of these units returned due to incorrect applications. A fuller explanation of this is my post at Ford Truck Enthusiasts:

http://www.ford-trucks.com/forums/955157-has-anyone-actually-used-the-hd-exhaust-manifold-3.html#post13285399

Suffice it to say that with all these returns, other 300 owners likely have been trying this conversion but a particular or various issue(s) seems to be popping up and I'd like to know if anyone here has any knowledge of the application issues of these manifolds besides the different hook-up to the exhaust pipe and the 3 bolt vs 4 bolt mating surface at the intake/exhaust heat exchanger... such as grinding or unique exhaust-to-block gaskets are a couple guesses of mine. Any and all info would be appreciated as I've been informed that a local salvage yard to me actually has an intake AND exhaust manifold still bolted together out of a 300cid that came from an F-500. I'm really tempted to jump on this but I would just like to be a little more informed. If at last resort, I can just pull my stock manifold and compare the two at the yard. FYI, my specific application would like to mate this HD manifold to an Offenhauser intake... so any issues you-all would know of, I'm listening! :) Thanks!

-Mike

Firepower354
Registered User
Posts: 172
Joined: Sun Jun 19, 2011 10:35 pm
Location: Flint, MI
Contact:

Re: 300 HD heavy duty exhaust manifold

Post #54 by Firepower354 » Sat Nov 02, 2013 1:55 pm

It looks like the HD would have to be shortened to have a turbo connected to it, or a j-pipe, with the motor mount that close?

https://fbcdn-sphotos-b-a.akamaihd.net/ ... 8291_o.jpg
It gets 10MPG, but goes up to 14 if I lie.

User avatar
chad
Registered User
Posts: 4750
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: 300 HD heavy duty exhaust manifold

Post #55 by chad » Mon Nov 04, 2013 9:35 am

Firepower354, that doesn't look like the ex. manifold I'm familiar with at all. I've seen a "finned monster"
on these 300 when in a larger rig. Not seen what U have a pic of... what is it?
Thnx,
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Firepower354
Registered User
Posts: 172
Joined: Sun Jun 19, 2011 10:35 pm
Location: Flint, MI
Contact:

Re: 300 HD heavy duty exhaust manifold

Post #56 by Firepower354 » Mon Nov 04, 2013 10:06 am

Sorry, that's a regular one. Pic is just to define area. HD looks to drop a lot farther down. I've figured that a J-bend will cure the issue. Not as tidy as a steel adapter to bolt turbo to manifold, but it'll work. Now to decide if an HD is worth it, since a little restriction isn't a deal breaker on a small turbo and 2000 RPM cruise speed
It gets 10MPG, but goes up to 14 if I lie.

User avatar
chad
Registered User
Posts: 4750
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: 300 HD heavy duty exhaust manifold

Post #57 by chad » Mon Nov 04, 2013 10:29 am

from what I've heard, no restriction - flows better than the next best - the split efi ex manifold. Last is the oem. There may B some after mrkt headers that fall in-between somewhere. Ask the 300/4.9 racers on our other forums (ck the "bd index"). It's all outta my range. There is nos, water injectors, meth, turbo, superchargers, alcohol racers there too, chk em out...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6026
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 HD heavy duty exhaust manifold

Post #58 by THE FRENCHTOWN FLYER » Mon Nov 04, 2013 12:21 pm

chad wrote:from what I've heard, no restriction ...

I'm guessing any restriction is in the ports and the transition into the log - not the log / outlet itself.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

motzingg
Registered User
Posts: 815
Joined: Tue Apr 30, 2013 8:16 am

Re: 300 HD heavy duty exhaust manifold

Post #59 by motzingg » Wed Nov 06, 2013 10:22 am

i'm with ya on that one, after spending a lot of time cutting mine up and looking at it from different angles, it seems that the tightest choke point is the transition into the plenum where it goes through a confined area, then has to circulate around the heat valve... that thing is a real killer.

I bent the valve up a little bit so it would tip out of the way better when it is closed (hot) but it still presents a heck of an obstruction. Not to mention forcing all exhaust flow up through the intake when it is open. If that jams or doesn't cycle fully, it could really hold ya back.


for a conservative turbo setup, i don't think a minor flow restriction matters much. packaging for vibration control, oil drain back, and reliability is way more important. I'm planning on keeping the stock intake and taking advantage of the big square section in the middle to cut off and weld on a sturdy steel flange.

on NA the 'try-y' setup from running the split EFI manifolds seems like it would be far and away superior to any log style manifold. Even with moderate modification to the exhaust system, it seems like that would be preferable.

aside from some sort of 'period correct' hot rod build (it would look hella boss hanging off the side of a t-bucket), i just dont see much advantage to the additional mucking around with the HD manifold. Plus you have constant heat which for a performance application or a van could be a big problem.

User avatar
Bullnose1985
New Member
Posts: 3
Joined: Fri Jul 10, 2015 8:46 pm
Location: North Western Missouri
Contact:

Re: 300 HD heavy duty exhaust manifold

Post #60 by Bullnose1985 » Thu Aug 06, 2015 11:01 pm

I haven't started on rebuild the engine as of yet, but here is some pictures of a offenhauser DP with a HD.
Dose anyone know what size are the 3 bolts are the bolts that attach the 2 manifolds? Well this ol'man cant figure out how to put pictures in a post.
Thanks for your time, Jon


Well bubba i tried but all the images are to large. I give up.
If anyone would like to see the photos you can find me on ford-trucks user name bullnose1985.
Last edited by Bullnose1985 on Fri Aug 07, 2015 10:18 am, edited 1 time in total.
[SIZE="3"][COLOR="Blue"]Jon 1985 6.9l diesel chassis running a (1979 7.5I 460), f250, 4x4, t19, BW1345, front: (light duty) dana 44 ifs and rear: dana 60 full floater.
3G alternator, duraspark II :-drink[/COLOR][/SIZE]

User avatar
bubba22349
Global Moderator
Posts: 9057
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: 300 HD heavy duty exhaust manifold

Post #61 by bubba22349 » Fri Aug 07, 2015 3:22 am

You can find everything you need on how to post pictures in the below link. Good luck :nod:
viewtopic.php?f=47&t=48863
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
Bullnose1985
New Member
Posts: 3
Joined: Fri Jul 10, 2015 8:46 pm
Location: North Western Missouri
Contact:

Re: 300 HD heavy duty exhaust manifold

Post #62 by Bullnose1985 » Fri Aug 07, 2015 10:11 am

bubba22349 wrote:You can find everything you need on how to post pictures in the below link. Good luck :nod:
http://www.fordsix.com/forum/viewtopic.php?f=47&t=48863


Thanks bubba! Here it goes.
[SIZE="3"][COLOR="Blue"]Jon 1985 6.9l diesel chassis running a (1979 7.5I 460), f250, 4x4, t19, BW1345, front: (light duty) dana 44 ifs and rear: dana 60 full floater.
3G alternator, duraspark II :-drink[/COLOR][/SIZE]

User avatar
chad
Registered User
Posts: 4750
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: 300 HD heavy duty exhaust manifold

Post #63 by chad » Fri Aug 07, 2015 7:32 pm

Bullnose1985 wrote:[b] Well bubba i tried but all the images are tooooo large. I give up.
If anyone would like to see the photos you can find me on ford-trucks user name bullnose1985.


came in good over there!
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Sleeep
Registered User
Posts: 7
Joined: Thu Jan 31, 2019 11:35 pm

Re: 300 HD heavy duty exhaust manifold

Post #64 by Sleeep » Wed May 08, 2019 11:38 am

Hey guys. I just picked up what I believe to be an HD exhaust manifold. It looks different than the one in this thread, but bolts right up, 2.5" outlet and all.
Appears to be from 1965.
You do not have the required permissions to view the files attached to this post.

Sleeep
Registered User
Posts: 7
Joined: Thu Jan 31, 2019 11:35 pm

Re: 300 HD heavy duty exhaust manifold

Post #65 by Sleeep » Wed May 08, 2019 11:45 am

One more pic
You do not have the required permissions to view the files attached to this post.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6026
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 HD heavy duty exhaust manifold

Post #66 by THE FRENCHTOWN FLYER » Wed May 08, 2019 1:15 pm

It appears to be a reconditioned used unit. Check for shrinkage in a prior life by measuring the bore spacing. It should be 4.480 from port-to-port.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

1986F150six
Registered User
Posts: 305
Joined: Wed Oct 24, 2012 3:11 pm
Location: Northwest Alabama

Re: 300 HD heavy duty exhaust manifold

Post #67 by 1986F150six » Wed May 08, 2019 3:06 pm

Congratulations on a great find! :thumbup:

Sleeep
Registered User
Posts: 7
Joined: Thu Jan 31, 2019 11:35 pm

Re: 300 HD heavy duty exhaust manifold

Post #68 by Sleeep » Wed May 08, 2019 3:13 pm

Thank you.
I just wanted to get some pics on here for reference for anyone interested. I have not seen this version of them before. I have an Offenhauser C I was going to use with it, they bolt up with no issues.

User avatar
bubba22349
Global Moderator
Posts: 9057
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: 300 HD heavy duty exhaust manifold

Post #69 by bubba22349 » Wed May 08, 2019 4:31 pm

:beer: Congrats that is a great score! The original 300 Heavy Duty exhaust manifolds are hard to find, they were only used on the biggest Ford trucks like the F500 & F600’s. They do bolt up fine and just the same as the regular log exhaust manifolds do if they are flat and aren't warped. It's also a great start to a nice 2 1/2 inch free flowing exhaust system using mandrel bends and a low restriction muffler like a Street Hemi Turbo type or Manaflow ect. You will need to change your head pipe but many muffler shops can build one if you can’t find one that works. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
chad
Registered User
Posts: 4750
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

300 HD heavy duty exhaust manifold

Post #70 by chad » Wed May 08, 2019 5:48 pm

different than I'm used to for "the HD".
It has a lrger main pipe w/the 'longitudinal raised ridges' along the length.
I'm sure I saw one in this thread, time to go back'n look...

Most go for the efi as it has performance improvements.

EDIT:
Yes, POST 23, 24 1st, 3rd, pic; 25 1st 2nd pic show these ridges.
I think the mount surface on ur flange might bite a gasket & improve adherence there. Not
sure on the 'ridges (improvement?). Stevens has the ridged 1 I think.
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Sleeep
Registered User
Posts: 7
Joined: Thu Jan 31, 2019 11:35 pm

Re: 300 HD heavy duty exhaust manifold

Post #71 by Sleeep » Wed May 08, 2019 11:54 pm

I wanted the single 2.5" exhaust. Clean and simple.

Thanks to these forums I found out enough about them to spot this one even though it looked a little different.

sdiesel
Registered User
Posts: 684
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: 300 HD heavy duty exhaust manifold

Post #72 by sdiesel » Thu May 09, 2019 9:45 am

clean and simple.
the HD is huge .
Muller has discussed the advantages to the efi at length, from a technical perspective there can be no argument that he is accurate.
the degree of improvement is in question, based on end use. and owners preferences.

to hang a wrapped turbo from the bottom of an HD manifold appears to be the Art of simplicity.
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

Who is online

Users browsing this forum: Google [Bot] and 21 guests