02sierraz71_5.3

iTrader: (2)

Talking with a local guy who builds race engines today told me about a process for porting heads where they use a thick paste like substance that contains abrasives. They force the material through the heads and it ports. The cool thing is that unlike cnc porting where a machine program is made that simulates the way air should flow through the heads this material actually flows through the heads taking out material along the same path as air would flow.

I forget the name it was something strange I had never heard of it. anyone else know anything about this?

Kano

iTrader: (3)

never heard of that

99Silver6.0

iTrader: (1)

Called Extrude-hone.

Peep the vids at the bottom of this page. http://www.extrudehone.com/orbitalafm.html#

PappyDan

iTrader: (4)

that has been around sence i was a teenager, and that was long ago in my youth.

99Silver6.0

iTrader: (1)

Yea, it has been around for a while. Just not used for head porting till now I dont think.

02sierraz71_5.3

iTrader: (2)

thats it the guy said he had some older style 350 SBC heads with extensive work that flowed 350+ @ .600 using that process Im skeptical but it definately sounded plausible and made sense

99Silver6.0

iTrader: (1)

I had the head pipe and expansion chamber extrude-honed as part of a pipe mod on my jetski. Seemed to work pretty dam well. Arm wrenching acceleration.

bootleg

Import guys use it hardcore. Lots of Z guys do that on the 300zx upper manifolds. I'd like to find somewhere in town to do that, I imagine it's much cheaper than buying new, ported heads.

bootleg

Also, there's a new process being looked into that's from what I can tell, just like sandblasting. I'll keep ya guys posted.