ARP thread chasers

[OldIron82]

In preparation for this weekends 6.9 head stud project, I was wondering about this thread chaser kit I seen for $118.00. It looks like 5 regular plain Jane thread taps but I'm just curious if they are something special I should purchase for that ridiculous price or if I should just get one from a hardware store if I all ready don't have the one I need?

On that note, does anyone know what the thread size happens to be in the block?

Thanks, OI82

 

[riotwarrior]

7/16 bottoming tap....lots of btake clean...air to blow out holes n some light lube prevent rust is good if not assembling right away.

Studs are good too instead of bolts

 

[IDIoit]

many people have used taps with success.
the problem with a cutting tap is just that...ITS A CUTTING TAP.
it will cut the threads if youre not perfect and carefull.
with the torque youre going to be putting on your nuts,
you may want to be extra carefull,

the thread chasers will not cut the metal.
they will just clean the threads.

i actually made a thread chaser from a bolt.
made 2 slices 180* from each other and then filed every thread to remove burs.

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[icanfixall]

Good idea using a bolt. Blowing out the dirt is going to be as important as cleaning the threads is. the 7.3 bolts are 1/2x13 threads and the 6.9 is 7/16x14 threads

 

[Knuckledragger]

Chasing a thread is whatever you want it to be. If you want to use all of the possible hole, you need a bottoming tap 7/16 - 14. Buy a good one, they should only cost about $20 at most. If you only want to clean the threads that already exist, use a bolt like IDIoit's. I have found that WD40 is a good deep hole cleaner, put the straw all the way into the hole and blast away. A couple squirts should be enough if the dirt is already loosened. Then use an air hose with a small tube that will fit into the hole, put it in all the way before blasting. That will clear out all of the dirt, chips and other debris that might be in there.

Note: if there is rust in the hole, only a tap will clean it out. Use cutting oil, too.

 

[Hydro-idi]

A bottoming tap is a must when cleaning head bolt holes. Very crucial that threads are clean to get correct torque when re-installing bolts.
I found that dipping tap in marvel mystery oil works amazing with breaking up the crud in between threads. Also chased threads 3x per hole and blew them out with brake cleaner & air gun once finished. Each ARP stud went in perfect after doing that.
Also recommend using anti-seize on the bolts with threads going down into block & ARP's special assembly lube on washers/bolts before you torque them down.

 

[OldIron82]

Thank you everyone! Looking forward to the weekend.