[Ron67]

My rockers are push in type and they aint going to cut it lol...broke one and have about 3 others lifting out. So should I have them tapped for screw in type or replace the broken one and have pins put it. I guess the price should be close in labor minus the cost off a new set of arp screw in type. What you guys think?

 

[Bad69cat]

ARP screw in ones are the only way to go IMHO....they will take all the abuse you can throw at them even with pretty high seat pressures....

 

[Ron67]

Mike,Im think same thing good thing i was in the driveway when it started coming apart at the seams lol

 

[Bad69cat]

Some guys are gutsy enough to try tapping them themselves - I prefer to leave it to the pro's! Unless you are feeling lucky.... ;>)

 

[doctordesoto]

i thought you needed to cut the top of the bosses for screw in studs---therefore the heads need to come off---i could be wrong

 

[Ron67]

Doc,You are correct did some looking around read a few sites mixed info .200 or .230 off the bosses but some other things I ran across NOT sure if this is fact.

Will replace push type just tap and reuse all old parts
http://www.jegs.com/i/Mr.+Gasket/720/1076/10002/-1

Now the ARP- Tap and mill bosses and will need new rockers or the rocker will hit the base of the stud where it now has the head for a socket.

 

[Bad69cat]

It wouldn't surprise me if we had to mill them...can't remember? I ended up having to shim some of the springs as well....so go back through everything and re-check your spring heights compressed/seated to get a good even/consistant configuration. Time well spent.....

 

[woodsnake]

Yup, a trp to the machine shop...Might look at getting new valve guides while you ae there, now would be the time...

 

[Ron67]

What sucks is I had new valves and springs also ported and gasket matched brain fart on the studs lol the guy that did the work never asked about my cam and I never thought to tell him. I have a new set of TF heads but want to use them on another engine for the same car hope to have it ready next summer but the way it worked out Im spending more then i planed on should of just built the other motor. So Im going to have the heads done again and finish it off right then look for a body to put it in when I get the other motor done... The wife will love this I messed up and get another car for it lol

 

[woodsnake]

It's not a mistake, it's a change,...If you have another engine you are building, then run this one until it dies...Or, sell the nice heads if you need to, and build this one up some more...

 

[Bad69cat]

No - you right Ron - you NEED another car!! LOL (That's the kind of thinking chicks can relate to - tell her it's like shoes....) ;>0

 

[1969XR7Vert]

...Will replace push type just tap and reuse all old parts
http://www.jegs.com/i/Mr.+Gasket/720/1076/10002/-1...

These are fine if you can get the holes tapped straight. There are tools available which mount to the adjacent stud and keep the one you are tapping straight.

Only caveat regarding "fine" is as long as the rest of the valvetrain can work (well) with rail type rockers (assuming that is what you have) or heads with slotted pushrod holes (which would be late model).

If you are in a pickle and the heads have already been done, I'd go with this method and parts. Do the work with the heads still on the engine, just use plenty of rags, etc. to keep the tap shavings out of the engine.

 

[Jester1023]

That's the one thing I miss about my days as an automotive machinist...I rigged my seat and guide machine with all of the necessary custom tools for machining stud bosses and tapping them for screw-in-studs. All of my stuff had to stay at the shop because I bought the tools with the shop's money...bummer. I'm going to be retooling in the near future, as I've gained access to a mill. I developed a fool proof method for leveling the head for propper geometry. I can't wait to do it again.

 

[Bad69cat]

HMMM - sounds like a road trip someday if I need any headwork done!! LOL Can't get anything done around here without a second mortgage on house! Be sure to advertise around different tracks in your area once you get it set up....bet you get plenty of new friends/customers

 

[Jester1023]

HMMM - sounds like a road trip someday if I need any headwork done!! LOL Can't get anything done around here without a second mortgage on house! Be sure to advertise around different tracks in your area once you get it set up....bet you get plenty of new friends/customers

That was the biggest problem with the shop I was in...it was located in a town with a circle track. They all wanted sponsored. The shop that I went to before I got out of it, I was a cylinder head specialist. I love finding horsepower in a set of cores.

 

[woodsnake]

Sounds like a good second income to me....The only downside is how cheap a set of aftermarket aluminum heads are these days..