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Old 07-09-2016, 12:08 PM   #1
Scooby Newbie
Member#: 296728
Join Date: Oct 2011
Chapter/Region: Tri-State
Location: Long Island, NY
2004 Sti

Default Chamber Volume Altering

has anyone took a die grinder to their heads in order to make all the chambers equal? mine are about 3ccs off from head to head. looking to make them all equal.
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Old 07-10-2016, 10:42 PM   #2
Scooby Specialist
Member#: 333468
Join Date: Sep 2012
Chapter/Region: RMIC
Location: SLC, UT
1993 SS
03 WRB GD 205/22T 20G-XT


I've used a die grinder to match 205 combustion chambers to a 22T bore. Each chamber was within 1cc of each other when I was finished.

Using a die grinder isn't an uncommon practice for chamber matching or valve deshrouding. You can also safely and easily remove material with a dremel using a barrel sander.

Get a piece of plexi glass and drill a hole in it, wipe some grease on the glass and stick it to your head and then measure the amount of liquid (use food coloring to make it more visible) it takes to fill each chamber and take away material if needed.
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Old 07-11-2016, 12:18 PM   #3
Scooby Specialist
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
2016 STI


you plan on grinding away 3cc's of aluminum with a handheld grinder?
it's one thing to deshroud or smooth areas out, but if the goal is material removal that is going to be tough to maintain a nice shape manually. Hogging it out is one thing, anybody can hog material out, having a nice contour on the surface is another thing.

Were your heads milled? And maybe they weren't milled equally?
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