Here is some of the racing and high horsepower applications that use heli coil as stated my the rep. As for the other documents they are in pdf so I will have to figure out how to share them. "Helicoil is a favorite in the industry. We sell to the following companies. These are the companies we deal with direct that specifically deal with the racing industry. Port City Racing SRI - Supplies For Racing Visteon Racing Technology Roush Racing Ellison Racing Ford Racing Dist. Ctr Livonia MI Visteon Racing Technology Supplies For Racing & Ind Joe Gibbs Racing Automotive Racing Products Roush Fenway Racing D & M Racing Roush & Yates Racing Engines"
Actually we use allot of hellicoils in threads on our manifolds from the factory but not because of what you sales rep is trying to promote, in either instance one can be shown to be stronger and last longer then the other. But it all comes down too the strength of the parent material you are putting the insert into. So if you put a helicoil in crap casting with porosity all through it it will no where near be as strong as a solid insert. But the reason why we use helicoils on all of our manifolds is they are easy to remove. (This is also a reason allot of racers use them too). Whenever you crossthread or screw up a bolt in a helicoil all you have too do is take a pair of pliers and just pull and the helicoil comes out in one strand, then you stick another in and you are good too go. Timeserts and Keenserts are permanent applications and honestly they are a pain in the wazoo to get out. So the answer is yes if you buy a new dart block or something comparable for drag racing and plan on tearing the heads off several times it is a good idea to helicoil the studs.
