block - head stud holes
 

12 MM 1.25 pitch sound right? I need to retap the holes in the head for the ARPs cuz they won't go in nicely.

Re: block - head stud holes
 

if anyone knows that would be sweet!! I wanna pick up the tap. I dont have time to get an ARP to bring with :(

Re: block - head stud holes
 

If you call ARP they would be able to tell you.

Re: block - head stud holes
 

the threads are 12mm x 1.25 but the problem is NO ONE HAS THIS TAP! I found one single place that can get it but that will take over a week.

I was thinking about using the old head bolts and "re-tapping" the threads *in the block* like that. I was gonna make the ARPS fit but the 5mm heads on them wont allow this heh. The allen or head bolt would get stripped. What are thoughts on this? Or is that way too ghetto?

Re: block - head stud holes
 

don't you mean tap the holes in the block?

Re: block - head stud holes
 

yes...

Re: block - head stud holes
 

You are looking in the wrong places if you can find a tap in that common of a size. Look in the yellow pages under machine supplies and start calling. Just like auto shops call parts stores for parts, machine shops can call suppliers for tooling. At the last machine shop I worked at we always had a wait a day for our vendor to make the trip down from the TC area because there werent many in southern minnesota.

If you really cant find anything Sears sells a thread repair kit that contains that size. The only thing is that it is a complete kit and not really cheap.

Re: block - head stud holes
 

heh no one carries this tap bro. Sears + auto stores don't even LIST this tap. I work at a machine shop and we don't have this tap. I found one machine / tool equipment store that can get them but it will take over a week to get it. I'm sure there are other stores that may have one even in stock, but I work normal business hours so getting to a store not in burnsville just isn't happening.

The ARP 5mm opening is getting stripped on 3 of my head studs!!! I'm gonna cry. We just re tapped a couple holes with a old head stud that had a 10mm opening so it's alot stronger than the ARPS 5mm. That seemed to do the job. Now I just have to figure out how to get the other ARPS back out and in again :P I might just buy new ones.

A couple seem like they are in as far as they go but they arent completely equal as far as how much of the stud is still sticking through the head. Is that normal? Is the ARP supposed to bottom out or just go in a ways.. This guy threw away my directions! I'll probably call ARP to see wtf the deal is.

Re: block - head stud holes
 

everyother time I've used ARPS i've had no problems. It was just these shitty threads in this block. I'm going to keep a 12mm 1.25 tap on hand from now on!

Re: block - head stud holes
 

Thats some shitty luck on the tap. Take a high grade bolt and cut a notch in it to act as a self tapper and run in through the holes.

Also, dont bottom out the bolts and dont use any lube on the block side either.

Re: block - head stud holes
 

Hey Josh, run over to Northern tool and equipment on Cliff right off 35E I believe. (Down past the old storm chasers building. The building is on the right hand side of Cliff RD as you are heading towards 35E. They have everything under the sun. Might be worth a shot to check there.

Re: block - head stud holes
 

dont have 12mm 1.25. was the first place i checked.