UR FUCT

as far as a better understanding of the process, the price, the gains compared to CNC. I just wanna do sumptin' different.

akaceril

it is when you force a very fine abrasive into and intake manifold etc. it pretty much polishes the inside and also ports it slightly. I am not sure if anyone has ever done this with heads or not. if they did I'm sure it would just be like a polish job. I could be wrong but that is what I remember.
I don't know of the price or gains though sorry.

It would be interesting to see if anyone has done this and what the gains/benefits were on a set of heads

QuickSilver

iTrader: (22)

Extrude honing can do more than just polish. THe longer the abrasive is flowed throught the more material it removes.
THis is actually a very good process because from everything i have ever read the semi-liquid abrasive flows throught very similar to the way air would flow.
And yes this can be done with heads, the valve seats jsut have to be re-cut after the process.
Hope this helped
Josh

30th TA 0219

Well, if they have never done that particular set of heads, be prepared to drop major $$. They need to program the flow of the material, so you would have to pay the programming fee. I called them a few years ago, and it was like $800 to do some SBC heads, so I can only imagine what a one-off head would cost!!

jimmyblue

iTrader: (11)

They don't just "program" it, part of the
art is in putting little "dams" in there
to get the flow of abrasive ooze to go in
the right direction (otherwise, it might
just keep flaring the turns outward, when
you want to fix the short side flow (instead
of punching through to the water jacket).

Where extrude-honing shines is in maximizing
flow through pieces whose passages are too
long, curvy, etc. to allow rotary tool
access. Like long-runner intakes. For cylinder
heads, almost everything you want to get at,
can be gotten at, way cheaper with hand tools
or even CNC.

Super high working pressures, so forget about
trying this on your plastic intake. Maybe on
the Holley.

Always wondered about whether a "poor man's
extrude-hone" would be practical (washtub
full of grit & water, a trash pump and a
venturi pickup, kind of like a wet sandblaster
only with a low viscosity medium and low
working pressures).

An electrochemical milling "snake" is another
interesting experiment for the home hobbyist,
salt and 12V makes for some pretty good
aluminum removal if you're patient or have
a high current supply.

Derek 357i

iTrader: (1)

I was looking at having my exhaust manifolds done (no room for headers) and it looked to me they wanted $500. www.extrudehone.com will give you the pertinent info.

UR FUCT

Any other input? Is it worth pursuing?

Ragtop 99

iTrader: (7)

In the past, extrude hone has been very expensive. The cost to do a set of heads probably would approach the cost of a set of good ported S1 heads and provide less gain.

If some reason you wanted almost stock heads, I'd try it with LS6 heads. Might be worth a few HP.