steve56 Posted November 30, 2015 Share Posted November 30, 2015 (edited) Anybody know what M12x1.25 thread chaser will fit in Subaru block. I want to clean out the holes for more even head bolt torque after doing head gaskets. Edited November 30, 2015 by steve56 Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 30, 2015 Share Posted November 30, 2015 Head bolts should be M11. Use a regular tap with an extension. http://www.airgas.com/product/Tools-%26-Hardware/Cutting-Tools/Taps,-Dies,-Chasers-%26-Threading-Tools/p/VIS21212?utm_campaign=airgaspl&utm_medium=product_listing&utm_source=google&gclid=CLDQ8Kf_tskCFRAWHwodcjcEXw#fo_c=306&fo_k=1e9841671e670d0cc10b1fde16826ed0&fo_s=gplaus Link to comment Share on other sites More sharing options...
steve56 Posted November 30, 2015 Author Share Posted November 30, 2015 Thanks for catching my error. My thread checker dosn't have an M11 size. Something didnt feel right when I had the head bolt in M12x1.25 thread checker. Whats the thread pitch on the M11 head bolt? Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 30, 2015 Share Posted November 30, 2015 Should be 1.25. Link to comment Share on other sites More sharing options...
lmdew Posted November 30, 2015 Share Posted November 30, 2015 Grab a spare bolt from a yard and file or grind a v notch down the length of the threads, you know have a backyard thread chaser. 2 Link to comment Share on other sites More sharing options...
CNY_Dave Posted November 30, 2015 Share Posted November 30, 2015 Grab a spare bolt from a yard and file or grind a v notch down the length of the threads, you know have a backyard thread chaser. I have done this in a few situations, if you wield a dremel carefully and get a very sharp square edge it works quite well. Link to comment Share on other sites More sharing options...
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