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Ever Build a Homemade Exhaust Manifold

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"Im wondering if anyone has ev

"Im wondering if anyone has ever built their own marine exhaust manifold? This is the water cooled style. Im needing something for a straight six inboard engine? Maybe using stainless steel tubing?

Any thoughts, info, websites, etc?"
 
"A friend had SS manifolds bui

"A friend had SS manifolds built for his 351 Ford I/0. Hasn't had to look at them since, 10 years ago now."
 
"The SS seams to be the best c

"The SS seams to be the best choice, if I decide to try and replace the original manifold. Still doing some research on the engine rebuild options."
 
"Steve.. Its been sometime sin

"Steve.. Its been sometime since you posted, but I'm curious as to what you are doing and what you've come up with, and why you aren't using an off the shelf int/exh manifold.

I am a bit of an inline 6 lover, thanks.

Have you thought of using a Clifford intake and taking a stock exh manifold and welding tube around it to make a water jacket ?

Thanks
Brian
http://www.kainonmedia.com
http://gallery.kainonmedia.com"
 
"Brian,

Welllll,as they sa

"Brian,

Welllll,as they say, heres "the whole load".

I have been pondering different re-power options(including a tri-powered 283)for my 64 Correct Craft American Skier. It currently has a flywheel-forward, 100hp/170CI, Inline 6 Ford/Interceptor.

After LOTS of research, I have decided to stay with the 6 banger(Love the sound!). The first thing Im planning to do is rebuild a 200CI six from a 79 Fairmont. We think its the largest displacement 6 that should "bolt" in place of the 170. That alone is good for aprox 20 to 25hp.

The biggest down side to these motors, is the fact that the intake is cast into the head, so aftermarket intakes arent made for this motor. However, they do make "adapters" that can be drilled and welded/brazed into the stock head/intake runner for multiple carb applications.

The boat currently uses a single Carter "YH" sidedraft carb that is aprox 190CFM. , This engine sure wasnt designed for performance.

They actually make an aluminum head for this motor, and with quite a bit of messaging, are pushing upwards of 300hp in cars out of some of these motors!

Problem .. Cost .. an aluminum head and intake are around $2,200, w/o carburation. Not in budget :-(


So, right now we are exploring different ideas on how best to "soup-up" a stock motor. The 79 head sports a larger carb intake bore and intake valves than the earlier versions. Plans are to do a little porting, mill the head, and do a three angle valve job.

Now, to the exhaust, the factory manifold only has around a 2" square opening, we would like to get around a 2 1/2". Thats where the homemade manifold question is coming into play. Right now, if the "flow numbers" even warrant new, Im thinking stainless steel might be easiest to make, as well as looking good.


We are still doing the math on what combo best fits into my "HP to cost" ratio.... 150 would sure be nice, but is probably stetching it a bit.

Any ideas or thoughts?
sorry for the long post...
Thanks Steve"
 
"BTW, thought Id post a pic of

"BTW, thought Id post a pic of the boat..

335394.jpg
64 American Skier
 
"I'm used to the no-budget

"I'm used to the no-budget way, so for me the '79 seems the best option, they say "there's no replacement for displacement". Has to be a good welder out there somewhere that can make you up a manifold. I might at least try the stock manifold if it fits, and I'm sure you'll find a way to get a carb setup on there, heck the orig carb may even work, you just may need to enlarge the jets a tiny bit.

Have you checked on the "Chris Craft" Posts? I know i've seen a few inlines in them.. maybe they might be able to help.

I love the sound of the inlines too.."
 
"Brian,

"No" budge

"Brian,

"No" budget or "Low" budget?
wink.gif

Good idea on the Chris Craft posts,might be worth "snooping" over there. Im not sure, but I think most of the Chris' sixes were flatheads(Chrysler?).

I have been talking with a "Ford-Six Guru" that has been guiding me thru some of the HiPo options on these motors. He knows a lot about the little "Falcon" motors and has taken an interest in this application. (He's never seen a this motor in a boat before).

A lot is still up in the air on induction and exhaust sizes required. I just got the motor last week and hope to start tearing it apart in a few weeks.
As they say...stay tuned..."
 
Glad to hear you found someone

Glad to hear you found someone that has true exp to help you.. can't wait to see some engine pics..


Happy Holiday!!
 
ps.. you may want to check out

ps.. you may want to check out this group.. good guys on this forum too.. I'm in with the TIN group :)
 
"Starcraft Boats, that's a

"Starcraft Boats, that's a interesting looking engine, looks a little like a GM 292ci with the Fuel pump in the middle, but the Dist and the oil filter is at the wrong end. The carb looks interesting.

Contact Hobbs Carburator Shop in Pelham NH if you need anything ( they just came to mind.. ) been there for a LONG time.

I'm guessing you've been on this site, http://www.fordsix.com/

and here, http://www.cliffordperformance.net/

and this art. http://www.mustangandfords.com/techarticles/5283_building_six_cylinder_engine/index.html

this looks like good reading to.. and it looks like the '64-'71 had the best HP 120hp @ 2400rpm.

http://www.mustangandfords.com/techarticles/mufp_0711_turbo_charged_six_cylinder_mustang/index.html

I need to do some more reading on the Ford Inlines myself. Have a good Day.. Thanks for the pics.

335410.jpg
six
 
"Thanks for the info... The Fo

"Thanks for the info... The Ford Six Site is where I found the guy that has been helping me. ...I will check out the tech articles.

In the chart you posted, looks like the 79 head would have the bigger intake valve size.."
 
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