emisson head bolt

[hulk_lil87gt]

hey guys putting the final touches on my 306 for budget i went with e7 heads im not putting any emissons on the car, and would like to know what sizes the hole are in the back of the head for the emissons tube. dont see the need to spend 10.00 for two bolts

 

[satanas]

hey guys putting the final touches on my 306 for budget i went with e7 heads im not putting any emissons on the car, and would like to know what sizes the hole are in the back of the head for the emissons tube. dont see the need to spend 10.00 for two bolts

maybe this will help
http://www.stangnet.com/mustang-forums/808953-bolt-thread-reference.html