Head bolt hole cleaning
Burning Brakes
Joined: Jul 2000
Posts: 1,134
Likes: 1
From: Arlington Texas
M8 x 1.25 are the small holes
I purchased from Summit Racing, but anyone that carries ARP can most likely get them for you.
Thread Starter
Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
You won't find a thread chaser for the large head bolts anywhere except ARP or Kent Moore. I own and have used both the ARP and Kent Moore thread chasers. IMHO, the only way to clean head bolt holes. These are NOT taps.
They are expensive but work very well, here's the ARP part numbers:
912-0001 Clean Out Tap M8 x 1.25
912-0011 Clean Out Tap, LS1 M11 x 2.0
They are expensive but work very well, here's the ARP part numbers:
912-0001 Clean Out Tap M8 x 1.25
912-0011 Clean Out Tap, LS1 M11 x 2.0
Great information. Since my installation is now on hold, I may just get a set of these
Safety Car
Joined: Jun 2005
Posts: 4,977
Likes: 256
From: St. Louis Missouri
Track Junky
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
As others have said, start with compressed air for the majority of the liquid. Then grind down an old head bolt on 2 sides. Run that bolt down into the hole several times until the grime/debris does not appear on the bolt.
Remember to grind down one of EACH size head bolt - the large one and small one. They are free and may help out a friend in the future as well. I still have mine from years ago...
Remember to grind down one of EACH size head bolt - the large one and small one. They are free and may help out a friend in the future as well. I still have mine from years ago...
