Cool!Studs in the side cover are nice addition .
18-8 Stainless Steel—Right-Hand Threaded | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | Prong Break-Off Tools | |||||||||||
5/16"-18 | 5/8" | Q | 0.332" | MS122-162 | 10 | 91732A740 | $9.04 | 91709A106 | $30.17 | 91709A443 | $26.07 | 90261A156 | $138.90 | 92955A113 | $130.00 |
5/16"-18 | 0.781" | Q | 0.332" | MS122-202 | 10 | 91732A224 | 17.20 | 91709A106 | 30.17 | 91709A443 | 26.07 | 90261A156 | 138.90 | 92955A113 | 130.00 |
5/16"-18 | 0.938" | Q | 0.332" | MS122-242 | 5 | 91732A741 | 8.15 | 91709A106 | 30.17 | 91709A443 | 26.07 | 90261A156 | 138.90 | 92955A113 | 130.00 |
I've always had to install them individually. They are bigger than the threads and torsion into place to secure them. It you stack them, the outer one can't compress to install.To install stacked heli-coils, can you pre-break off one tang, stack them on a bolt with a "stop nut" prevent it from moving "up" the bolt, then install, and break off the lower tang? That would keep the "timing" close to perfect. Let set with loctite on outer threads, then remove inner installation bolt...
I have gotten into the habit of putting Time Serts in all my flatheads And Animals . Never felt that the heli coils were a permanent? solution. Never used the other insert you have a picture of. And Plus I build all of my header braces. Or should I say , overbuild them.Hey fellas I havta fix my outside head bolt next to the exhaust valve. What is the insert of choice? I have available an insert style and two heli coils. I read something recently that it would be a good idea to stack the helicoils but is that even necessary? All opinions appreciated, Ale.View attachment 19567
I used helicoils on this one but I’m planning on leaving studs in it, not thinking I should havta worry about them coming out with the bolt. Usually I throw the poor things away when there’s too many messed up threads but this one is special. I sure appreciate all the responses from people who know the right ways.I have gotten into the habit of putting Time Serts in all my flatheads And Animals . Never felt that the heli coils were a permanent? solution. Never used the other insert you have a picture of. And Plus I build all of my header braces. Or should I say , overbuild them.
Longer helicoil? Lol that would be ideal but I had enough trouble just finding the regular ones…Why not just install a longer Coil? Am I missing something? Sounds like I am.
I purchased some roughly 3/4" long 1/4-20 and 5/16-18 helicoils from my local Fastenal.Longer helicoil? Lol that would be ideal but I had enough trouble just finding the regular ones…
I've honed cool bores without a torque plate and then put the headbolts with washers. You can see the deflection or whatever you call it in the bore. Actually see the warping!Consider the length of the threads on the bolt and the threads in the block.
When you torque that bolt, the pull is on the entire length of the threads of that bolt and the distortion of the cylinder is somewhat limited due to the length of the thread contact.
Not convinced? Try honing a cylinder without a torque plate and bolts.
Then try it with the torque plate but using shorter bolts.
Now hone the cylinder with the torque plates and the right length bolts...You will visually see the difference