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Anyone Use Extrude Hone for Exhaust Manifolds?
#125427
09/24/08 10:15 AM
09/24/08 10:15 AM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,446
Indiana
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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.)
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: YO7_A66]
#125428
09/24/08 10:37 AM
09/24/08 10:37 AM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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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  
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: ScottSmith_Harms]
#125432
09/24/08 10:57 AM
09/24/08 10:57 AM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
OP
master
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OP
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Joined: Jan 2003
Posts: 5,446
Indiana
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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.)
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: YO7_A66]
#125434
09/24/08 12:21 PM
09/24/08 12:21 PM
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Joined: Jan 2003
Posts: 75,336
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,336
A gulag near you.
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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 .
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: JohnRR]
#125435
09/29/08 08:21 AM
09/29/08 08:21 AM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
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OP
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Joined: Jan 2003
Posts: 5,446
Indiana
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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.)
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: Ludington1]
#125437
09/29/08 07:06 PM
09/29/08 07:06 PM
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Joined: Jan 2003
Posts: 7,978
Bethel Ct
AdamR
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Bethel Ct
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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 ?
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: AdamR]
#125440
09/29/08 08:41 PM
09/29/08 08:41 PM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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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.
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: ScottSmith_Harms]
#125441
09/29/08 08:58 PM
09/29/08 08:58 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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scott
did you do exhaust only
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: ScottSmith_Harms]
#125443
09/29/08 09:06 PM
09/29/08 09:06 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i,d be curious about doing intake,heads and exhaust as a matched set to see what the results might be
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: ScottSmith_Harms]
#125444
09/29/08 09:07 PM
09/29/08 09:07 PM
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Joined: Jan 2003
Posts: 6,570
San Francisco Ca
SCATPK
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master
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Posts: 6,570
San Francisco Ca
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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.
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Re: Anyone Use Extrude Hone for Exhaust Manifolds?
[Re: SCATPK]
#125445
09/29/08 09:20 PM
09/29/08 09:20 PM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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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. 
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