SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: electrowoman on June 16, 2010, 06:37:12 AM

Title: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: electrowoman on June 16, 2010, 06:37:12 AM: I can't find much of anything reasonable in the line of 460 exhaust. I need headers that are water
jacketed for an enclosed engine compartment.

Surely someone makes a reasonably priced high flow exhaust that fits the bill.

What are you guys running for high flow manifolds? They don't have to flow like
a funny car but better than long bolt logs.

No not the over the transom surf board type. I'd love it but the wife would shoot me if I told her the sun deck was now an exhaust port ::)

Anyone have any used Hi Flow for sale?

I added a picture of the original engine so you could see the room available. I think I could modify for
width but not height.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: 74 howard 21rc on June 16, 2010, 07:57:15 AM: Lightning Mfg in Lake Elsonore Ca.They are a bit pricey though.Other than that I am not sure there is much out there for a Ford.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: Marcsrollin on June 16, 2010, 08:55:43 AM: But chevy exhaust and use a adapter.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: electrowoman on June 16, 2010, 09:51:21 AM: I would consider the chebby adapters.

I'm trying to find out what you guys have tried and found to work. I could go spend $3000 on exhaust and still not get what the engine needs.

Then the engine wouldn't be happy and neither would the wife :mad:

What enclosed compartment headers have you guys tried and found to work?

That's the question of the ages ;D
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: Luckie Stiff on June 16, 2010, 10:09:57 AM: Check your PMs
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: electrowoman on June 16, 2010, 10:54:28 AM: Quote from: Luckie Stiff on June 16, 2010, 10:09:57 AM
Check your PMs
Thank you for that. Now next issue, will these manifolds clear tall valve covers? I'm running
a stud girdle. Any one know for sure if they will clear?
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: Luckie Stiff on June 16, 2010, 11:01:31 AM: Quote from: electrowoman on June 16, 2010, 10:54:28 AM
Thank you for that. Now next issue, will these manifolds clear tall valve covers? I'm running
a stud girdle. Any one know for sure if they will clear?

Yes, they will clear tall v/c especially with the adapters to BBC
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: SS-201 on June 17, 2010, 03:06:32 AM: There was a set on here for sale, long bolt great manifold $ 500.00 and Glenwood are available for around $ 600-700 new, work well and will clear valve covers
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: electrowoman on June 17, 2010, 11:01:04 AM: Quote from: SS-201 on June 17, 2010, 03:06:32 AM
There was a set on here for sale, long bolt great manifold $ 500.00 and Glenwood are available for around $ 600-700 new, work well and will clear valve covers

Are these the long bolts you're talking about... this is the current setup.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: SS-201 on June 18, 2010, 03:42:42 AM: Yes, those are the ones.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: AQUAHOLIC on June 18, 2010, 05:39:01 AM: lightning headers are the best. but ohh sooooo expensive
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: SS-201 on June 18, 2010, 05:53:42 AM: Hardin marine has the new 460 great but $ 1800.00, My personal opinion unless you have all the parts necessary to produce high HP, Torque they are not necessary. I have run similar on my 351 engine honestly can't tell the difference. There are too many variables in boats to pin down one particular componet apples to apples.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: Your Mom on June 18, 2010, 07:31:01 AM: I would run a pair of felpro exhaust gaskets NOT SILICONE to these type of logs. If you have the step down snails.... you can cut off the lower part to have 3 1/2 insted of 3. I run this type with the cut off and gaskets and nice ss tips with 0 problems. http://www.summitracing.com/search/Make/FORD/Engine-Size/7-5L-460/?keyword=fel+pro+exhaust+gaskets
sale on tips
http://www.performanceboats.com/html/forums/showthread.php?t=56911
I noticed you didnt cut your bolts down to fit...I believe I cut mine to 6 1/2"
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fimg707.imageshack.us%2Fimg707%2F3310%2Fyourmomshenhouse.jpg&hash=464de696ff4dc368371d0d152a413d01701b78c1) (http://img707.imageshack.us/i/yourmomshenhouse.jpg/)
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: electrowoman on June 18, 2010, 11:16:04 AM: ;D Our bolts are home made by my son, I can't complain.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: Your Mom on June 18, 2010, 06:42:51 PM: Quote from: electrowoman on June 18, 2010, 11:16:04 AM
;D Our bolts are home made by my son, I can't complain.

Nice job on your motor....looks real hot rod :thumbup:
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: electrowoman on June 18, 2010, 07:05:59 PM: Thank you, same for you!
What intake is that you're using?
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: Your Mom on June 19, 2010, 06:53:29 AM: Quote from: electrowoman on June 18, 2010, 07:05:59 PM
Thank you, same for you!
What intake is that you're using?
Just a polished powdercoated performer....D3VE heads, mild cam, mallory diz, Holly750 vac sec...I have a rpm sitting on a back up motor but its gonna get stroked. Maybe next season.
Title: Re: What are the best flowing exhaust manifolds for an enclosed engine compartment
Post by: jet boat performance on June 19, 2010, 08:57:34 AM: The adaptor shuffle plates to make BBC manifolds work on BBF are very good and the biggest "downside" if it can be considered one is that they "widen" the engine profile slightly , I used the chart from Eddies web site to help with my decision for my Blown BBC cruiser , as a dealer for nearly all of them including Lightning (not represrented on the dyno results ) I had lots of options available to me I have been very happy with the EMI Thunders. simplicity of installation and rigging as well as the fact that they are almost "cool" to the touch and have never had reason for regret Tom
BTW FWIW withstanding the pure weight , one of the best intakes for that motor is actually the Cobra jet iron deal !
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi147.photobucket.com%2Falbums%2Fr319%2Fjetboatperformance%2F2010%2520misc%2FDSC09058.jpg&hash=0633f468d22fbc0d31c3ace63dcdf1eea3b381bb)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi147.photobucket.com%2Falbums%2Fr319%2Fjetboatperformance%2FEliminator%2520V-drive%2FResizeofDSC00306.jpg&hash=6887eeedca531f55c58fe2c118d8c4aadb386bdb)