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What Exhaust Would You Go With?

bowtie

bowtie

Member
OK guys, I am considering changing my exhaust out later this winter to either some high perf manifolds or headers and was curious which ones would be reccomended and which ones I should avoid. These would be for a 1987 Ambassador with a 5.7 small block, with over 400 HP and a fairly large cam, with through the transom below the swim platform exhaust. I would like to say keep it under $1,000.00, but I have only seen one set for that price and those are the Revolution Marine headers/manifolds. So lets say under $2,000.00 new. Perhaps once I know what I want I may be able to find some good used ones
 
OK guys, I am considering changing my exhaust out later this winter to either some high perf manifolds or headers and was curious which ones would be reccomended and which ones I should avoid. These would be for a 1987 Ambassador with a 5.7 small block, with over 400 HP and a fairly large cam, with through the transom below the swim platform exhaust. I would like to say keep it under $1,000.00, but I have only seen one set for that price and those are the Revolution Marine headers/manifolds. So lets say under $2,000.00 new. Perhaps once I know what I want I may be able to find some good used ones
 
You've got a tight engine compartment,so you have to be careful. Stainless Marine makes a nice Header Style manifold. The riser adjusts easily to many different angles.And in the Checkmates I've had the exhaust holes were NOT straight out the back of the boat,so you need to angle them.E bay is a great place to find some used ones.
 
Finding a used set up for a small block will be difficult. Most giys are running big blocks, so used parts are more readily available. I would consider a set of CMI headers. But they would blow your $2k budget out of the water.
 
what exhaust are you running now.. cam #s would be cool too.. no mattah what u do.. your risers/pipes are gonna have to be custom made.. 1000.00 will buy you nothing.. and if you find some and make em work in the boat.. wedging twisting yada... ya mise well buy a new motor..
 
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by happy:
what exhaust are you running now.. cam #s would be cool too.. no mattah what u do.. your risers/pipes are gonna have to be custom made.. 1000.00 will buy you nothing.. and if you find some and make em work in the boat.. wedging twisting yada... ya mise well buy a new motor.. </div></BLOCKQUOTE>
I am currently running either stock Merc exhaust or stock type replacements with stock risers as far as I can tell. I am running the Crane part# 109831 which is a hyd roller with 222/230 deg duration at .050 with .509/.528 lift with 1.5 rockers. I have seen a few companies that claim to make small block exhaust for Alpha application designed for exhaust outlets below the swim platform, would those not work? I know the Revolution Marines set up is all aluminum which concerns me a little but it is less $1,000.00 (http://revolutionmarine.com/shopsite_sc/store/html/sbcexhaust.html), there is also these from Lightning Marine under 2 (http://www.cpperformance.com/detail.aspx?ID=6302), and then there are these I found from Eddie Marine (http://www.eddiemarine.com/cart/details.asp?SubCategoryID=280&CategoryID=107) which I have seen somewhere for under 2k but do not remember where. Does anyone on here of first hand experience with any of these?
 
The lightnings are nice,if you can afford it go with them,theres no match for a true tubular header.I have heard good things about the revolutions on Speedwake forum.
 
i don't know a lot about revolution marine.. in fact... other than cutomers internet shopping.. havne't seen em.. what lil info i do know is the 1000 dollar big block set up it cast iron.. and from the websit looks like a cross between eddie marine and pcm exhaust manifolds.

here is what i do know.. if you want to keep your engine pumping as much horsepower as you say it is.. you need to get quality exhaust.. and performance does not come cheap.. since you have to drop down in an s shape to get under your platform i would reccomend stainless marine, or cmi..

off the websit for revolution, i saw no options which would benifit your engine that the exhaust you have now is already doing.

if revolution marine is out here on this site,,, im sure a bunch of us would love to hear some flow #s, pics of custom set ups.. yada yada..

my motto... you can have all the bling you want... "it gets lonley at the dock watching neons"" @@@ get ya mota runnin!!!
 
Honestly I have not seen the inside of the stock type manifolds, I just envisioned them being similar to a stock automotive type ex manifold where #1 ex would run back and meet #3 ex which would intersect at a T with #5 and #7 ex before turning up to the exit, if the stock manifold actually uses individual runners which then meet together in some sort of merge type collector near the exit to the riser then I could see where there would be little to no advantage to the Revolution's design. However if the stock manifold is how I envisioned it I would think there would be a considerable difference. It would seem to me like the difference of stock automotive manifold, compared to shorty headers, compared to full long tube headers. Of course the only true tubular headers I could even consider affording would be the lightning marine ones, and they do show a set for below swim deck exhaust exits. Did you see those, if so what did you think of them.
 
Lightning will custom bend a set for 150.00 extra.My buddys sunsation has 4 seasons on his and they still look and function great,compared to CMIs prices,you cant beat them.
 
i have seen the cp performane cyclone , i think they call it the low exit system or such.. its a tube header system.. and i would guess be around 2 - 3 k..

your biggest concern would be the introduction of water reversion.. be careful that your exhaust set up will prevent this..
 
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by happy:
i have seen the cp performane cyclone , i think they call it the low exit system or such.. its a tube header system.. and i would guess be around 2 - 3 k..

your biggest concern would be the introduction of water reversion.. be careful that your exhaust set up will prevent this.. </div></BLOCKQUOTE>
This brings up another question, would the water reversion problem be more or less likely with aftermarket exhaust? I would assume it would be less likely, but am I wrong?
 
vinny had an excellent post on reversion a few months back.. hopefully he can re-itterate it for you.. reversion occures during valve overlap at low rpm.. while the intake and exhaust valves are open at the same time..will suck water back into the engine.. stock exhaust rarely works on hopped up engines..

i have seen reversion on stock 502's with performance manifolds and short risers.. the cure for this is a longer riser pipe out the back of the boat.. then your appeased with noise laws....

notebly.... when you change out your exhaust.. be prepared to purchase relocation brackets. namely power steering/alt brackets, shift assy's, and ecm if applicable..

i do know if you contact stainless marine, cp performance, and eddie marine, these guys will work with you, and offer you the best exhaust system for your boat. you'll have to take some measurments, and send them off (its easy)>>> our secretary does it, and the first time she did it, she got it right w no input fm any wrench twister.
 
Boatn 70 would be able to help with this he just went through it with his convincer.I,m going to do my research as well .My ambasador is getting new exhaust this spring. Got any pics of the thru hull location? I,m adding it to the old girl.
 
Sorry, I do not have a site set up to post pictures yet. Besides that I only have one pic of the back of the boat and it only shows one outlet. I will try to get some better pics and set something up on one of the host sites so I can link to it.
 
Hey I have a 88 ambassador 5.7 260 which I also want to upgrade the exhaust this winter. I have thru hull corsa silent choice. I am checking out out eddies aluminum and will probably go with the stock performance upgrade. It looks like its about 1100 bucks. I hope it will wake up it up a bit. Let us know what you go with and send some pics.
 
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by corrupt ambassador:
Hey I have a 88 ambassador 5.7 260 which I also want to upgrade the exhaust this winter. I have thru hull corsa silent choice. I am checking out out eddies aluminum and will probably go with the stock performance upgrade. It looks like its about 1100 bucks. I hope it will wake up it up a bit. Let us know what you go with and send some pics. </div></BLOCKQUOTE>
Have you checked out Revolution Marines exhaust??? They are about $950.00 only they are all aluminum (I can not remember if the EMI's use stainless tubes for the exhaust inside the aluminum manifold or not), but the Revolution Marine manifolds do incorporate a reversion dam on the floor of the heat riser which would help eliminate water reversion problems. I need to take some measurements and some pics and then make some phone calls, but as it stands right now I am leaning towards the Lightning headers as long as they will fit. They go for under 2K.
 
Go for the lighting headers.to check for water reversion u have to pull headers back off after first 30 min. run time .I know a real pain but nessasery with your cam set up.Also keep a extra 250 bucks in your boat for noise violation .my senator has a set of them and it is rediculiousy loud./but extremly cool.Watch out for jonny law.
 
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