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How much will these headers hurt my small block? #436290 08/12/09 11:30 PM 08/12/09 11:30 PM
Joined: Feb 2005 Posts: 682 Land of Lost flatlinedude OP No pulse
flatlinedude OP No pulse Joined: Feb 2005 Posts: 682 Land of Lost	Stock magnum 360 long block, cam and all. Dual plane intake, carter 750, thats all thats done to it. In an a body with a 28" tire and 4.10 gear. I have 1 5/8" hooker comps on it now and it runs good, but the headers are about shot. I have a set of tubular automotive 1 7/8 x 3.5" headers that I'd like to set-up and use. I know the combo is all sorts of wrong, but will it make that much of a noticeable different from the smaller tubes? I eventually plan on doing a head and cam upgrade. Thanks. Carol: "Wow! He's really fast, isn't he?!" John: "Yeah... but he's stupid."

Re: How much will these headers hurt my small block? [Re: flatlinedude] #436291 08/12/09 11:41 PM 08/12/09 11:41 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	You'll have to turn a 360 pretty hard to get any benefit from a 1 7/8" tube. Even then, 3" collector would be better than 3 1/2".

Re: How much will these headers hurt my small block? [Re: S/ST 3040] #436292 08/13/09 12:12 AM 08/13/09 12:12 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I agree as I only use 1-3/4 tube headers on the 440 in my mid 11 second 63. I would suspect you will loose some low end and will not make it up on the other end with your combo right now. Ron

Re: How much will these headers hurt my small block? [Re: S/ST 3040] #436293 08/13/09 12:47 AM 08/13/09 12:47 AM
Joined: Feb 2005 Posts: 682 Land of Lost flatlinedude OP No pulse
flatlinedude OP No pulse Joined: Feb 2005 Posts: 682 Land of Lost	I know they are far from optimal, but about how much power loss are we talking? This motor currently is all in by 5k... lol dang deisel. Another header question, will the slip fit tubes be leaky if used with an actual exhaust? Seems like they very well could with the back pressure... ? Carol: "Wow! He's really fast, isn't he?!" John: "Yeah... but he's stupid."

Re: How much will these headers hurt my small block? [Re: flatlinedude] #436294 08/13/09 12:52 AM 08/13/09 12:52 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: I know they are far from optimal, but about how much power loss are we talking? This motor currently is all in by 5k... lol dang deisel. Another header question, will the slip fit tubes be leaky if used with an actual exhaust? Seems like they very well could with the back pressure... ? Hard to say how much power you would loose... on the slip fit, they are pretty decent fit(or they should be) and after a short time they tend to seal up even better (rust and or carbon)

Re: How much will these headers hurt my small block? [Re: flatlinedude] #436295 08/13/09 02:35 AM 08/13/09 02:35 AM
Joined: Mar 2008 Posts: 883 Affton MO Q qwkmopardan super stock
qwkmopardan super stock Q Joined: Mar 2008 Posts: 883 Affton MO	With a restrictive exhaust syatem it probably won't effect it much at all. If you were talking open headers I would expect some low end laziness which could be cured by putting a 2 1/2" street hook-up reducer on them. I would expect some minor leakage around the slip fit joints, and as Mr P said the longer they are together the better they should seal.

Re: How much will these headers hurt my small block? [Re: qwkmopardan] #436296 08/13/09 10:35 AM 08/13/09 10:35 AM
Joined: Feb 2005 Posts: 682 Land of Lost flatlinedude OP No pulse
flatlinedude OP No pulse Joined: Feb 2005 Posts: 682 Land of Lost	Is it common practice to use any type of sealer or anything on these type of joints? The exhaust is just 2.5" w/ chambered mufflers dumped at the axle. Carol: "Wow! He's really fast, isn't he?!" John: "Yeah... but he's stupid."

Re: How much will these headers hurt my small block? [Re: flatlinedude] #436297 08/13/09 12:10 PM 08/13/09 12:10 PM
Joined: Feb 2007 Posts: 2,578 sweden 1 1Fast340 master
1Fast340 master 1 Joined: Feb 2007 Posts: 2,578 sweden	Quote: Is it common practice to use any type of sealer or anything on these type of joints? The exhaust is just 2.5" w/ chambered mufflers dumped at the axle. i never used any sealer on the slipjoint on my TTI headers and they have been sealing up perfectly, this was with 3" exhaust and some diferent mufflers but no problems keeping it sealed!

Re: How much will these headers hurt my small block? [Re: flatlinedude] #436298 08/13/09 12:13 PM 08/13/09 12:13 PM
Joined: Oct 2004 Posts: 8,165 Left Coast B BobR master
BobR master B Joined: Oct 2004 Posts: 8,165 Left Coast	Quote: Is it common practice to use any type of sealer or anything on these type of joints? The exhaust is just 2.5" w/ chambered mufflers dumped at the axle. Chambered mufflers cause back pressure and therefore may cause your slipjoints to leak. I would toss those in favor of a good flowthrough muffler.

Re: How much will these headers hurt my small block? [Re: BobR] #436299 08/13/09 04:29 PM 08/13/09 04:29 PM
Joined: Feb 2005 Posts: 682 Land of Lost flatlinedude OP No pulse
flatlinedude OP No pulse Joined: Feb 2005 Posts: 682 Land of Lost	Thanks guys. Just trying to work with what I've got. Thanks again. Carol: "Wow! He's really fast, isn't he?!" John: "Yeah... but he's stupid."

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