what are the best all motor heads? - Page 2

2FastLX · 12-06-2001, 05:03 AM

For what it's worth, I work in a machine shop making jet engine parts day in and day out. We work with aluminum a lot. The only reason aluminum is heli-coiled (we use key-serts which are better) is for repetitive bolting and unbolting of parts together. The aluminum threads will hold up just fine as long as you don't get crazy with over torquing and strip them out. I think the TFS quality issues have all been resolved long ago, but I still have heard people who have used both swear by AFR.

And the reason people have had problems with heli-coils pulling out of the AFR heads is probably because they had bolts that were too long and were bottoming out in the holes which would easily pull the heli-coil out. Just a guess.

Moxie · 12-06-2001, 12:10 PM

Thanks for the info. I'm not a machinist, so I wasn't aware of that.

As for TFS problems, I have 3 customers who purchased the TW heads when they were new a few years ago. One guy had wear problems because the heads had been assembled with steel valve guides instead of bronze. TFS replaced the parts under warranty. My other 2 customers sent their heads back for the same reason, and TFS took care of them as well. Since then, the TFS heads haven't caused any problems. TFS now installs bronze valve guides in their heads.

I understand some other people have had issues with the TFS heads, however in my indirect experience, the guys here haven't had any serious problems with them.

12-06-2001, 05:03 AM	#21
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	For what it's worth, I work in a machine shop making jet engine parts day in and day out. We work with aluminum a lot. The only reason aluminum is heli-coiled (we use key-serts which are better) is for repetitive bolting and unbolting of parts together. The aluminum threads will hold up just fine as long as you don't get crazy with over torquing and strip them out. I think the TFS quality issues have all been resolved long ago, but I still have heard people who have used both swear by AFR. And the reason people have had problems with heli-coils pulling out of the AFR heads is probably because they had bolts that were too long and were bottoming out in the holes which would easily pull the heli-coil out. Just a guess. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

12-06-2001, 12:10 PM	#22
Moxie Registered Member Join Date: Aug 2000 Location: Plymouth, MI Posts: 254	Thanks for the info. I'm not a machinist, so I wasn't aware of that. As for TFS problems, I have 3 customers who purchased the TW heads when they were new a few years ago. One guy had wear problems because the heads had been assembled with steel valve guides instead of bronze. TFS replaced the parts under warranty. My other 2 customers sent their heads back for the same reason, and TFS took care of them as well. Since then, the TFS heads haven't caused any problems. TFS now installs bronze valve guides in their heads. I understand some other people have had issues with the TFS heads, however in my indirect experience, the guys here haven't had any serious problems with them.