Just wondering how much power is lost/gained in the swap. I'm rebuilding my blower motor, a 454 and 6/71 Weiand set up for about 7lbs boost, 600-700hp. The thing is so LOUD I'm considering Logs and Snails to quiet it down some, and get my family more interested in coming along. I'm not after every last horsepower, just an impressive looking boat with lots of oomph. I've even thought about cutting the collectors off the Bassetts and replacing them with big honkin' mufflers. Any ideas?
Ralph

Through transom header....

I'll be perfectly honest with you, blowers do not really gonna care much which exhaust you use from a "real life" performance standpoint. You can split hairs on a dyno, but in reality we use these things at a multitude of different elevation levels, quality of fuels, etc and I know none of us tunes for that routinely either that would net more HP gain than the headers vs logs scenario.  Yes, TT headers are every bit as loud as OT headers when I tried them on Moo.  Maybe quieter in the NWZ and at low cruise speeds, but WFO or 3000 RPM or so? just as noisy, just as hot, etc.

At the end of the day, if the logs are quiet, cool, and make you happy, I don't think headers are going to make the MAYBE 25 or so HP increase you'd get worth it compared to the aggravation of them on a blown engine. I would, however, make sure you cut off the ends of the snails to the 3 1/2" step and use 3 1/2" or 4" tips.

I don't think thats a bad move at all. I got more than my share of header burns, and if you look around while out on the water, I see less and less blown motors with headers and zoomies than I used to. Everyone going to Center-risers and logs, and I AM seeing more blown engines out there also. 

Ray

You wanna see badass? I'm kicking myself I didn't get a pic of it. I thought I did, but wasn't on the camera. Anyway, Hallet Dave's new setup is cool as friggin hell, retains the rear jump seats, and would work VERY well with a blower engine in that thing!

Ray

Yep thats hallett dave, and your not! I would say a center rise or water jacketed headers like lightning would be the way to go! Snails are going to take away some power and then its going to sound like every other jet boat

Sent from my Samsung Galaxy S 4G

Looks like I'm in the market for logs n' snails. I kinda like the old style way they look. Any one brand flow better than another? Any I should particularly avoid?
Ralph

Correct me if I'm wrong here... Didn't your wife (or girlfriend) get a serious burn from your's?

yeah but that was due to the guy that i have weld em up chopping off the section that holds the water in the riser.  thats all fixed now and they're as cool as a cucumber.  also changed the water flow, in from the bottom rear and out of the top front of the manifolds so the whole thing fills up with water. before there was an air pocket at the top and water just skimmed the bottom.  these things didnt come with an instruction manual and it seems like everyone has em plumbed up differently.

Harman marine are very stout....the water passages go up to ports. Harman marine snails also have a step down. You can cut the first step off to give 3 1/2 and add a small piece of 3 1/2 to have a 4" tip. I went 3 1/2 with 3 1/2 ss angled tips. The butterfly's dont last and the 4" ss tips have a better internal metal flapper option. Ask around...might score a cheap set...
http://cgi.ebay.com/ebaymotors/Harman-Marine-BB-Chevy-Exhaust-Manifolds-Never-Used-/200643677380?pt=Boat_Parts_Accessories_Gear&hash=item2eb74b8cc4
http://cgi.ebay.com/ebaymotors/HARMAN-MARINE-EXHAUST-RISERS-2-7-8-OUTLET-/160638762772?pt=Boat_Parts_Accessories_Gear&hash=item2566d0ff14

I've already had two people get burns from my OT headers, and one of 'em was me! So.... any preference of log manufacturers, or are they all pretty much the same?

This for a Chebbie?



These are very nice, polished, and if you notice, staggered length so the snails are even and the same length hose used on each side.

I also have a set of OT pipes for these, not the best, but I've definately seen worse, that are same length for use with these if you're interested.
 (the pipe on the bottom. The top one is from another set to show how most are staggered for std logs)



Beware, the OT pipes part gets just as hot as headers, although the logs are cool when running.

Ray

PS, every snail I've seen can be cut off to the 3 1/2" step. I have had Harmans, Hardins, even got a pair of nice Nicsons here that can, just FYI

In most cases you cannot use a exhaust port gasket on logs but the Harman you can and I do now and have had the other cheap type. Nothing but issues. Bolts comming loose, cracks and exhaust leaks. A good set of felpros on harmans and forget about em...well, give em a polish from time to time....Also try and find a set that is seperated already for inspection and ad some new gaskets from log to snail. Jim brock(on this site)makes em. They are the best period. The green standard ones suck ass and will not last.

i just used some high temp silicone on my logs and my manifolds... maybe once im done ripping things apart and putting em back together every week ill slap some exhaust gaskets on it. 

Theres always header wrap/tape(for your headers). They look cool and come with benefits....

Where in the world does THAT look cool? or even work on a boat? Wrapping your headers up like a 3rd degree burn victim? Really?   

On the other, yes, ceramic coating DOES help, but burns are still inevitable with them. Doesn't cool them THAT much, just protects the finish and lowers the exit exhaust temps.

I think you're on the right track. Especially with a blown engine. Once you install these, prove my point with your results............

Ray

I disagree with you sir on the subject of ceramic coating. Several years ago we installed a set of plain Hooker headers on a customers '73 Bronco w/ a 302 Those things got so hot that it melted his plug wires and almost caught his carpet on fire. We pulled them off and he had them coated. Put the headers back on and problem solved. I have ceramic coated headers on my '70 el camino and I am amazed as to how cool they stay. However, I do agree with you on the header wrap situation. Not only does that stuff look ugly, but it also traps moisture and eventually the headers will rot.

my gf's leg is proof enough.  exhaust = hot.