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To Extrude Hone or not.......
#1

So I finished porting my Gnari exhaust manifold to what I think is a pretty good looking port job, now looking at previous postings on here about the flow numbers that an EH ported exhaust flows, I feel that it may be a nice benefit for flow and faster spooling, even including the $400 cost that they quoted me. I would rather not go the header route as this is my daily driver and I do not want to mess with cracking welds and have exhaust leaks. The cast iron manifold is my first choice and I also plan on getting it coated by Swaintech with their white lightning coating, so do you think the effort to have it EH'd is worth the money? Car has a 3" straight DP, 2.5" duals with maxflows, T3/T4 50 trim, ported head ready to go on it, BoPort 1.5 cam and 60# injectors. I realize that my stock (for now) intake will hold back me back some, but also working on porting an extra one I have to go on it as well. I have read all of the older posts about the process and I know that there are mixed thoughts on it, but why not some more. Thanks
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#2

(07-14-2021, 06:32 PM)Kuch Wrote:  So I finished porting my Gnari exhaust manifold to what I think is a pretty good looking port job, now looking at previous postings on here about the flow numbers that an EH ported exhaust flows, I feel that it may be a nice benefit for flow and faster spooling, even including the $400 cost that they quoted me. I would rather not go the header route as this is my daily driver and I do not want to mess with cracking welds and have exhaust leaks. The cast iron manifold is my first choice and I also plan on getting it coated by Swaintech with their white lightning coating, so do you think the effort to have it EH'd is worth the money? Car has a 3" straight DP, 2.5" duals with maxflows, T3/T4 50 trim, ported head ready to go on it, BoPort 1.5 cam and 60# injectors. I realize that my stock (for now) intake will hold back me back some, but also working on porting an extra one I have to go on it as well. I have read all of the older posts about the process and I know that there are mixed thoughts on it, but why not some more. Thanks
I checked into it and found the EH cost alone was double the cost of professionally worked intake from one of the suppliers on this site!
It was in the neighborhood of $600!!!!
IMO, any gains would not justify the cost
1986 SVO daily driver. PiMP v1.4/3" Stinger exhaust/FMIC/Schlodes Manifolds/Boport 2.1 and head/GM 3700 stall 200-4R auto trans
1963 2.3T Ranchero Project
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#3

The process hasn't changed since its inception, so everything people have said about it over the last 30+ years still applies.

Extrude Honing doesn't remove much material and isn't really a great option for manifold porting, especially considering the cost. It's more of a finishing post-process and I think it may have been developed for aerospace hydraulic systems or industrial applications. An hour or two with some medium/fine cartridge rolls will save you a lot of money and get comparable results.
'72 Pinto Runabout-2.3T/T5/MS-II.
I'll show those guys who's in top place, I'll really give'em a hotrod race.
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#4

You both make some great points, and convinced me to get the sanding rolls out! Thanks for the advice.
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