using a helicoil on an aluminum intake

[VetteVet]

the threads are 1/2 x 14 npsf
Here's a pdf. scroll to the bottom if you can read it.

............http://www.jegs.com/InstallationInst.../350-75164.pdf

[hayhauler71]

I think it is 1/2 pipe thread
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[jocko]

i usually wait til I NEED to insert a heli-coil, but once ya need it, ya NEED it... I wouldn't drill out and use a larger bolt personally - but it does work. If you don't mind three 1/4-20 and one oddball 5/16-whatever, then go for it. But if you want to retain the original fasteners, helicoil is good to go. Consider that if you use a larger bolt that passes through something like a carb base plate, it will have to be enlarged also...

Heli-coils aren't cheap, but I try to keep a few of the more common ones around on hand. I messed up my T5 trans bearing retainer screw hole by over-tightening (Ugh!!) and the helicoil worked great. Still had to open up the trans case to get the shavings out though.

[GRX]

Helicoils are cheap. Buying the kit with the special tap is where it gets expensive. Yep. I am one of those who has installed Helicoils in aluminum to prevent future problems. Like where the shifter mounts to my Muncie Rock Crusher for instance. I have installed hundreds of Helicoils (and similar) at work. They are stronger than the aluminum by far. The most common mistake is when people forget to break off the little installation tab on the coil insert. The bolt comes down, hits that, and distorts the coil making the bolt/stud lock in place.

[eldogg]

I've helicoiled more intakes that I care to remember. I always use red loctite on the inserts when I install them. Good luck.
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