What size thread chaser for head bolts

[GNut]

Heads are off for an upgrade so in the process of cleaning up I want to chase down all the head bolt holes. What size chaser do I use and where's the easiest place to get one?

Thanks..

 

[sumnerw]

The size is 7/16-14. ARP sells thread chasers. The part number for their 7/16-14 thread chaser is 911-0004.

Since many of the head bolts end in the water jacket, a regular 7/16-14 tap should work just fine.

Buzz White in Houston, TX (sumnerw@flash.net)

 

[Chuck Leeper]

chaserz??

Powerhouse products in Memphis has a nice set of thread chasers for a really right price.. Like less than 1/2 of ARP's stuff.
I'd suggest not using taps to clean threads.. Taps are of many different classes, and can/will remove some the thread material. Chasers are ground undersize to prevent that problem....

Back under my rock!