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Anyone Use Extrude Hone for Exhaust Manifolds? #125427 09/24/08 11:15 AM 09/24/08 11:15 AM
Joined: Jan 2003 Posts: 5,443 Indiana Y YO7_A66 OP master
YO7_A66 OP master Y Joined: Jan 2003 Posts: 5,443 Indiana	I read a post that used the company name Extrude Hone out of Irwin Pa. I checked out their web sight and they show some pricing for doing V8 exhaust manifolds for $675. http://www.gethoned.com/parts.php?get_price=yourparts&show=automotive Has anyone tried this? If so, do they give a flow rating? Does anyone have any real-world experience that they can share? I hear that they are only worth minimal, but I am looking for actual numbers if anyone can help. I have read other posts about this process, but I am looking to see if anyone has any dyno or time slip results to compare. Thanks 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] #125428 09/24/08 11:37 AM 09/24/08 11:37 AM
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	Quote: I read a post that used the company name Extrude Hone out of Irwin Pa. I checked out their web sight and they show some pricing for doing V8 exhaust manifolds for $675. http://www.gethoned.com/parts.php?get_price=yourparts&show=automotive Has anyone tried this? If so, do they give a flow rating? Does anyone have any real-world experience that they can share? I hear that they are only worth minimal, but I am looking for actual numbers if anyone can help. I have read other posts about this process, but I am looking to see if anyone has any dyno or time slip results to compare. Thanks Waste of money [IMG]http://i430.photobucket.com/albums/qq21/ajcasini/max_zpsdppwd9km.jpg[/IMG]

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: YO7_A66] #125429 09/24/08 11:37 AM 09/24/08 11:37 AM
Joined: Jan 2003 Posts: 74,974 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,974 U.S.S.A.	yes it has been done , what manifold do you want to have done , every design will react differently

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: JohnRR] #125430 09/24/08 11:48 AM 09/24/08 11:48 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	What it's "worth" will vary with every individuals opinion. Does it make a difference? Yes, the degree will vary with the deign as JohnRR suggests, as well as with your other parts in the combo, the benifits will vary depending on where the bottlenecks are in your combo. I have not done flow tests but have had a set of 340 manifolds done, as compared to stck they are not noticabley larger (hogged out, etc.) but they are extremely smooth and clean inside which I'm sure affects the flow in a positive mannor. My guess is 5-10HP gain overall, not much but when every bit counts a gain is a gain. 4707173-CenterPortBeforeExtrudeHone.jpg (882 downloads)

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125431 09/24/08 11:49 AM 09/24/08 11:49 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	After, same port 4707174-CenterPortAfterExtrudeHone.jpg (1242 downloads)

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125432 09/24/08 11:57 AM 09/24/08 11:57 AM
Joined: Jan 2003 Posts: 5,443 Indiana Y YO7_A66 OP master
YO7_A66 OP master Y Joined: Jan 2003 Posts: 5,443 Indiana	Thank you all for the quick replies. I was reviewing the process for my 70 340 HP exhaust manifolds. I am currently trying to decide on a Winter project, and I am considering the Dougs or TTI headers. But when I read this thread, it got me curious when the price was lower than the TTi's. I will assume that the extrude hone will not give the performance of the Dougs/TTi's, but that got me curious to see if anyone has done any testing of their own on this process to see that the actual gains may be. Thanks for the pictures Scott!! I have emailed them to see if they have done any of their own flow/hp/tq tests but I have yet to hear back from them. Thanks again. 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] #125433 09/24/08 12:12 PM 09/24/08 12:12 PM
Joined: Jul 2005 Posts: 3,072 Farmland, IN Ludington1 master
Ludington1 master Joined: Jul 2005 Posts: 3,072 Farmland, IN	There's a post in the race forum here on Moparts about F.A.S.T. intake/exhaust manifolds and there is some real-world feedback. Darren

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: YO7_A66] #125434 09/24/08 01:21 PM 09/24/08 01:21 PM
Joined: Jan 2003 Posts: 74,974 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,974 U.S.S.A.	Quote: Thank you all for the quick replies. I was reviewing the process for my 70 340 HP exhaust manifolds. I am currently trying to decide on a Winter project, and I am considering the Dougs or TTI headers. But when I read this thread, it got me curious when the price was lower than the TTi's. I will assume that the extrude hone will not give the performance of the Dougs/TTi's, but that got me curious to see if anyone has done any testing of their own on this process to see that the actual gains may be. Thanks for the pictures Scott!! I have emailed them to see if they have done any of their own flow/hp/tq tests but I have yet to hear back from them. Thanks again. It's not going to give you the gains a set of full length headers do .

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: JohnRR] #125435 09/29/08 09:21 AM 09/29/08 09:21 AM
Joined: Jan 2003 Posts: 5,443 Indiana Y YO7_A66 OP master
YO7_A66 OP master Y Joined: Jan 2003 Posts: 5,443 Indiana	I want to thank everyone for their replies. I just received an email from Extrude Hone and this is what they said for performace gains on exhaust manifolds: ""Rick says that after processing the average airflow increase is 15% with an approximate 15 to 20 horsepower increase. The cost to Extrude Hone process your exhaust manifolds is $675.00 (per pair) plus shipping. The turn around time will be approximately two weeks"" I just wanted to pass on the information. 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] #125436 09/29/08 10:17 AM 09/29/08 10:17 AM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	A few years ago Mopar Muscle magazine had a coronet convertible project car with a 440 (If I remember correctly?) Anyhow, they did a comparison with stock vs. extrude honed manifolds and it only resulted in a small performance gain. They then went to headers and got a pretty good performance gain. Sorry, I don't recall the exact numbers. I would only do the extrude hone route if you have to use the stock manifolds.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: Ludington1] #125437 09/29/08 08:06 PM 09/29/08 08:06 PM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	Quote: There's a post in the race forum here on Moparts about F.A.S.T. intake/exhaust manifolds and there is some real-world feedback. Darren I cant find that thread. Do you have a link to it ?

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: AdamR] #125438 09/29/08 08:11 PM 09/29/08 08:11 PM
Joined: Jul 2005 Posts: 3,072 Farmland, IN Ludington1 master
Ludington1 master Joined: Jul 2005 Posts: 3,072 Farmland, IN	Try this link... or do a search in the Race forum for "F.A.S.T." and it will come up. Darren

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: Ludington1] #125439 09/29/08 09:27 PM 09/29/08 09:27 PM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	Thanks, I tried the search first with no luck.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: AdamR] #125440 09/29/08 09:41 PM 09/29/08 09:41 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	Quote: want to thank everyone for their replies. I just received an email from Extrude Hone and this is what they said for performace gains on exhaust manifolds: ""Rick says that after processing the average airflow increase is 15% with an approximate 15 to 20 horsepower increase. The cost to Extrude Hone process your exhaust manifolds is $675.00 (per pair) plus shipping. The turn around time will be approximately two weeks"" I just wanted to pass on the information. For the record, "Rick" is the guy who helped me get my 340 manifolds done, after seeing the before and after results first hand I find his WAG of 15% - 15-20HP gains pretty optimistic, possible? sure, probable? Not IMO. But I do think you could see roughly half that amount of gain in many cases. They are nice and smooth inside which will help flow, but the volume has changed VERY little, not much material has been removed and I asked for the "Max" amount be removed. I'd dare to say that simply ceramic coating the insides could result in similar gains in flow. For the record I would go to Extrude Hone again if looking for every last bit of HP, I'm happy with the work, not so much with the price, but went in with a conservative hopeful outcome so regardless of how minimal the gain, I'm happy so far. Dyno run is next week, I'm going to try and have some stockers dyno'd during the same run.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125441 09/29/08 09:58 PM 09/29/08 09:58 PM
A Anonymous Unregistered
Anonymous Unregistered A	scott did you do exhaust only

Re: Anyone Use Extrude Hone for Exhaust Manifolds? #125442 09/29/08 10:00 PM 09/29/08 10:00 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	Yes Tom, just the exhaust. The intake has some simple mods in the carb opening, otherwise it's stock. I believe adding to the plenum volume might be a benifit so EH'n it might have been a good way to go but I chose not to.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125443 09/29/08 10:06 PM 09/29/08 10:06 PM
A Anonymous Unregistered
Anonymous Unregistered A	i,d be curious about doing intake,heads and exhaust as a matched set to see what the results might be

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: ScottSmith_Harms] #125444 09/29/08 10:07 PM 09/29/08 10:07 PM
Joined: Jan 2003 Posts: 6,570 San Francisco Ca SCATPK master
SCATPK master Joined: Jan 2003 Posts: 6,570 San Francisco Ca	I have a real world comparison between extrude honed stock manifolds and a set of TTI headers on my old 70 340 swinger. The engine was the original 340 that was bored .030 over with a somewhat hot hyd cam from Hughes engines and an Edelbrock RPM intake and Holley 3310 carb, heads had Hughes stage 1 porting done to them. Had the original 727 trans with shift kit and 2800rpm stall converter and 355 gears. I had the stock manifolds connected to the TTI system from the headpipes back and the car ran a best of 13.46@101mph. I then installed a set of TTI stepped headers and with no other changes ran a 12.76@106 on its first run down the track. So is the extrude hone worth it, not in my opinion.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: SCATPK] #125445 09/29/08 10:20 PM 09/29/08 10:20 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	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? Tomr, My heads were already ported and done so no reason to EH them. Having all 3 done should result in a gain but I doubt it would match what customer ported heads would offer. I guess you could have custom ported heads EH'd as well.

Re: Anyone Use Extrude Hone for Exhaust Manifolds? [Re: SCATPK] #125446 09/29/08 10:22 PM 09/29/08 10:22 PM
Joined: Nov 2007 Posts: 5,337 the house on the left. C cogen80 master
cogen80 master C Joined: Nov 2007 Posts: 5,337 the house on the left.	a while back i was talking with one of those F.A.S.T guys and he said he had his 340 manifolds done and it did nothing at all for him. even if it did help it better be a big difference for the price they get for that.

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