Head Bolt Thread Size...
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TECH Junkie
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From: Port Neches, TX
Head Bolt Thread Size... Hi All,
Got an L-92 block I'm working on... What size chaser tap do I need for the head bolt holes? I always though they were 11mm, but after trying a few random bolts it appears they are some flavor of 10mm. I tried 2 different pitches and neither would thread in more than a round by hand...
Got an L-92 block I'm working on... What size chaser tap do I need for the head bolt holes? I always though they were 11mm, but after trying a few random bolts it appears they are some flavor of 10mm. I tried 2 different pitches and neither would thread in more than a round by hand...
Thread pitch 11mm x 2.0
Not something you are going to find at the local hardware store.
Not something you are going to find at the local hardware store.
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Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Thread Starter
TECH Junkie
iTrader: (11)
Joined: Jul 2005
Posts: 3,782
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From: Port Neches, TX
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TECH Junkie
iTrader: (11)
Joined: Jul 2005
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From: Port Neches, TX
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
I bought the ARP thread chaser for the larger head bolts. Its a nice piece. It has large sections cut out to help collect the debris that comes out of the holes. I also has the threads all the way to the tip, which most taps do not have. I have done two complete motors with it already and it seems to be holding up great. This tool will last you a while.
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
I tried that and broke my threads out of one of the holes and had to use a Kent Moore time-sert thread repair kit. The problem is the bolt's threads do not pick up all the trash and they have a nub at the end of the bolt causing it to push the trash further down in the hole. You would have to severely modify the bolt to make it as effective as the ARP thread chaser. Its good insurance to have it IMO.
