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Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: cogen80] #125447 09/29/08 09:33 PM 09/29/08 09:33 PM
Joined: Jan 2003 Posts: 21,498 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 21,498 Eagle, Idaho	Too bad that some manifold designs make it almost impossible to get a porting bit up inside them because getting the opening bigger is what counts. My brother was able to really open up a set of buick 455 manifolds since they were more of a swept back design that exit facing the back of the engine. All he had to do was buy a couple really long porting bits to reach way up inside.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125448 09/29/08 09:40 PM 09/29/08 09:40 PM
Joined: Jan 2003 Posts: 6,570 San Francisco Ca SCATPK master
SCATPK master Joined: Jan 2003 Posts: 6,570 San Francisco Ca	Quote: SKATPAK, All due respect, nobody is arguing that headers will out perform factory manifolds, of course they will, especially a warmed over engine. The question is, how much gain will Extrude Honed factory castings offer over untouched castings, and is (whatever that gain is) worth it? Scott, it seemed that the original poster was considering going with headers and I just posted an actual comparison between the 2 different setups. No doubt that headers make a big difference in a warmed over engine! But in my opinion the extrude process is not worth the money for the small gain if any.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: SCATPK] #125449 09/29/08 10:01 PM 09/29/08 10:01 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	It's all good Herb. One thing's for sure, having driven allot of street/strip cars I am a big fan of stock manifolds, good all around performance, quiet, and mostly trouble free. Headers can be a PIA on the street but for drag racing they are king for sure.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125450 09/30/08 11:01 AM 09/30/08 11:01 AM
Joined: Jan 2003 Posts: 5,446 Indiana Y YO7_A66 OP master
YO7_A66 OP master Y Joined: Jan 2003 Posts: 5,446 Indiana	I just reviewed the article in Mopar Muscle when they dynoed the 7 different exhaust manifold/header combos and I am still surprised that the TTI's were only +16 ft/lbs and + 12 hp over the 70 HP units on the mild small block. I know that the numbers will go up as a motor gets more modified, but I am still trying to justify the price of the TTi's (apx $740) and the Doug's (apx $550) and the Extrude Hone (apx $675 + shipping) for only 16ft/lbs and 12 hp maximum gains. I just want to thank everyone again for their replies and their experiences on this subject. 4719882-340hpTTi.pdf (313 downloads) 1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: YO7_A66] #125451 09/30/08 11:17 AM 09/30/08 11:17 AM
Joined: Jan 2003 Posts: 75,338 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,338 A gulag near you.	Quote: I just reviewed the article in Mopar Muscle when they dynoed the 7 different exhaust manifold/header combos and I am still surprised that the TTI's were only +16 ft/lbs and + 12 hp over the 70 HP units on the mild small block. I know that the numbers will go up as a motor gets more modified, but I am still trying to justify the price of the TTi's (apx $740) and the Doug's (apx $550) and the Extrude Hone (apx $675 + shipping) for only 16ft/lbs and 12 hp maximum gains. I just want to thank everyone again for their replies and their experiences on this subject. Well if you BELIEVE what Extrude told you you'll see the same increase from their process as the TTi's ...

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: YO7_A66] #125452 09/30/08 11:20 AM 09/30/08 11:20 AM
Joined: Nov 2003 Posts: 5,160 Texas dannysbee master
dannysbee master Joined: Nov 2003 Posts: 5,160 Texas	Your High Performance Mopar engines were blessed with a nice set of free flowing manifolds from the factory. For 99% of the street strip cars they will be more than adequite just the way Mopar made them. If it were me and looking for a little more performance I would concentrate down stream from the manifolds with a nice 2 1/2" mandrel bent exhaust with a x pipe and large free flowing mufflers. I looked at you engine specs and looks like you have a nice combo. I also noticed you didn't mention any head work. If your heads are basically stock a good port and valve job from a reputable shop would probably give some good bang for the buck. Last edited by dannysbee; 09/30/08 11:36 AM. Getting old just means you were smarter than some and luckier than others.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: dannysbee] #125453 09/30/08 11:34 AM 09/30/08 11:34 AM
Joined: Jan 2003 Posts: 5,446 Indiana Y YO7_A66 OP master
YO7_A66 OP master Y Joined: Jan 2003 Posts: 5,446 Indiana	Danny, I an currently running 2-1/4" pipes with an H pipe, and two 440/Hemi style mufflers. John, I do not believe the Extrude Hone information and I was just passing on information to the board. Thank you for the replies. 1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: YO7_A66] #125454 09/30/08 11:57 AM 09/30/08 11:57 AM
Joined: Nov 2003 Posts: 5,160 Texas dannysbee master
dannysbee master Joined: Nov 2003 Posts: 5,160 Texas	The X is better than the H, along with the 2 1/2" pipe. Both would help. The mufflers can be decieving. Big body with big inlets and outlets somtimes does not = big flow. I would look at the mufflers that ths F.A.S.T. guys are using as they are in 10's and 11's at the strip with a 2 1/2" exhaust. I looked at your engine specs and I believe some head work as in a nice port and valve job would be where I would put my money after the exhaust. Hope you find some of this useful. Getting old just means you were smarter than some and luckier than others.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: dannysbee] #125455 09/30/08 12:07 PM 09/30/08 12:07 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Folks I will post a real world comparison next week. I have a set of untouched factory 71 A-body 340 manifolds as well as an identical set that have been Extrude Honed, both will be tested on the same engine with no changes and the same pair of exhaust pipe extensions. Keep in mind that any gains (or lack of) may vary with ANY engine combo, it's all about where the engines "bottlenecks" are, if it's the exhaust manifolds (which is what I expect mine will be) you might see a bigger gain with EH manifolds, in my case will will soon see.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: dannysbee] #125456 09/30/08 12:29 PM 09/30/08 12:29 PM
Joined: Jan 2003 Posts: 5,446 Indiana Y YO7_A66 OP master
YO7_A66 OP master Y Joined: Jan 2003 Posts: 5,446 Indiana	Dan, I have already had the heads pocket ported along with the 3 angle valve job. Hopefully one of the FAST guys will chime in on some small block muffler choices. Thank you again. Scott, PLEASE check back in with us with your results and thank you for your efforts! 1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: YO7_A66] #125457 09/30/08 02:18 PM 09/30/08 02:18 PM
Joined: Mar 2006 Posts: 9,910 Eighty Four, PA B G Racing master
B G Racing master Joined: Mar 2006 Posts: 9,910 Eighty Four, PA	I was just going to leave my not worth the money comment stand for it's self.But after hearing the claims of increase %s I must comment further.Years ago we had a local racer peddeling the extrudeahone process.Butch Palm was the racer that I recall,anyway we got caught up in the action and had a set of manifolds(intake and exhaust)done for a 440 it was very pricey for back then.The car was a dialed in 440-6 cuda that ran low 12s consistantly.After the process the car lossed a tenth.We struggled with jetting and anything else we thought was effected with no results.We replaced everything back to stock(manifolds)and regained our loss tenth.Was it worth the time and money?Heck no! [IMG]http://i430.photobucket.com/albums/qq21/ajcasini/max_zpsdppwd9km.jpg[/IMG]

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125458 09/30/08 02:29 PM 09/30/08 02:29 PM
Joined: Nov 2003 Posts: 5,160 Texas dannysbee master
dannysbee master Joined: Nov 2003 Posts: 5,160 Texas	Scott it sure would be neat to set that up with a X pipe and some high flow mufflers also. Just for a comparison between open pipes and real in car performance. Getting old just means you were smarter than some and luckier than others.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125459 10/01/08 06:08 AM 10/01/08 06:08 AM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	Quote: Folks I will post a real world comparison next week. I have a set of untouched factory 71 A-body 340 manifolds as well as an identical set that have been Extrude Honed, both will be tested on the same engine with no changes and the same pair of exhaust pipe extensions. Keep in mind that any gains (or lack of) may vary with ANY engine combo, it's all about where the engines "bottlenecks" are, if it's the exhaust manifolds (which is what I expect mine will be) you might see a bigger gain with EH manifolds, in my case will will soon see. Scott, anyway you can test a 68-71 passenger side manifold Vs your 71 passenger unit ?

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: AdamR] #125460 10/01/08 10:40 AM 10/01/08 10:40 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	The dyno guy doesn't have an exhaust system other than the cobbled up pipes I provided (X-pipe vs H-pipe, etc) so there's no way I can do that comparo. All they had were headers for my engine. Concerning the 70 style manifold, I don't have an EH'd pass side 70 manifold but I do have a stock one. The problem is that they are going to charge me for extra time in changing out parts and I already went out of pocket to do the EH vs non EH test that I did primarily to get you guys a real world test/answer. If anyone wants to pitch in $150.00 I will send over my 70 pass manifold off and have them compare those vs stock 71's as well. This is the stock set I just gave them. 4722461-71StockExhaustManifolds.jpg (447 downloads)

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125461 10/01/08 10:52 AM 10/01/08 10:52 AM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 master
CJK440 master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	I think thats the same pass side manifold my 72 has and I'm going to guess the only difference between the 71 and 72 drivers casting is the addition of that large rib on top. The rest looks the same. People have told me 71's have a better set of manifolds than a 72 and I don't see why. 2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: CJK440] #125462 10/01/08 10:54 AM 10/01/08 10:54 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	I agree, I have examples of both, PS 71 vs 72 I can see zero difference, also no difference betwen DS 71's and 72's in regards to internal shape.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125463 10/01/08 11:20 AM 10/01/08 11:20 AM
Joined: Nov 2003 Posts: 5,160 Texas dannysbee master
dannysbee master Joined: Nov 2003 Posts: 5,160 Texas	The 71 manifolds look better but have no performance advantage. My buddy changed the 72 ps manifold to a 68-70 PS manifold and saw no measurable improvement. This was in a stock cubic inch 12 second car. Getting old just means you were smarter than some and luckier than others.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125464 10/01/08 12:46 PM 10/01/08 12:46 PM
Joined: Jan 2003 Posts: 8,227 New Mexico UCUDANT Troll Hunter
UCUDANT Troll Hunter Joined: Jan 2003 Posts: 8,227 New Mexico	Quote: I agree, I have examples of both, PS 71 vs 72 I can see zero difference, also no difference betwen DS 71's and 72's in regards to internal shape. Compare the shape of the drivers side upper/outer corner. The 72 is definately different externally, have you CC'd them for an internal comparison?

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: UCUDANT] #125465 10/01/08 12:53 PM 10/01/08 12:53 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	No Bob, haven'tt CC'd them just a visual inspection.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: UCUDANT] #125466 10/01/08 01:02 PM 10/01/08 01:02 PM
Joined: Jul 2008 Posts: 30,632 Florida STAYcation IcorkSOAK Financed his waterbed
IcorkSOAK Financed his waterbed Joined: Jul 2008 Posts: 30,632 Florida STAYcation	Almost 7 hun for a set from EH ? .... it used to be under 4 hun !! I say PAY yourself almost a HUN per hour and do-it yourself. I spent about 6 or so hours on a set of 69 HP B engine ones and were more than pleased with the results.

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