C3 aluminum heads HELP!
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C3 aluminum heads HELP!
C3 350 new flo-teck aluminum heads. Stripped a rocker stud while torquing studs, the intake side of #3 cyl. (there are only 5 threads to grab b4 it comes into the intake cavern). Question...is there oversized studs where you can re-tap the stud-hole a size bigger?? Theres gotta be a fix for this situation......any help?? thankx..smokengunz.
PS..what is the correct torque for these rocker studs...we were told 50 ft.lbs. (Seems alot for aluminum with anti-seize lub)
PS..what is the correct torque for these rocker studs...we were told 50 ft.lbs. (Seems alot for aluminum with anti-seize lub)
Last edited by smokengunz; Jan 28, 2012 at 07:21 PM.
Team Owner
Joined: Jan 2006
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From: Crossville TN
Torque specs are lower for bolts going into aluminum. Are you applying the torques recommended by the head manufacturer? And with AL heads and steel bolts, loc-tite may be in order if the joint is supposed to be permanent.
Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
Well, 'permanent' using Loc-tite isn't permanent, anyway. It just ups the torque required to break them loose...which is what is needed. Anti-sieze is [effectively] a lubricant, which would tend to lower break-away torque. I understand why you use it, but not sure how beneficial it is....unless you have a racing engine that you disassemble regularly.
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Thankx gentlemen....picked up a heli-coil kit at Ace 7/16 x 14 and had it fixed in 20 minutes. I guess we werent the FIRST to strip one..lol. Told my Son to get cast heads but he wanted aluminum...oh well!!! Seems to be a debate on anti-sieze vs lock-tite. We used anti-sieze on studs which torqued ok and lock-tite on the stripped one heli-coiled. Two different philosophies at each end of the spectrum. Ive been using both on MY '59 vette since 1965.... both good products. but a newbie to aluminum. Thankx again...
Le Mans Master
Joined: Mar 2008
Posts: 5,948
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From: Oxford MA-----You just lost the game!!!!
Those are El cheapo aluminum heads, you can get them for about 700 bucks a pair, right? Once the engine is up and running, let us know how they work out, and if you have any other problems with them, OK? Who did ya buy 'em from?
Scott
Scott
Drifting
Joined: Jun 2010
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From: Oxford Ohio
My love affair with anti seize is deeply embedded in my soul by the number of hours I've spent getting broken bolts/studs out of aluminum. I also use a lot of lock-tight and thread sealer, but they haven't been as painful as removing broken studs/bolts and pulled out threads.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
My love affair with anti seize is deeply embedded in my soul by the number of hours I've spent getting broken bolts/studs out of aluminum. I also use a lot of lock-tight and thread sealer, but they haven't been as painful as removing broken studs/bolts and pulled out threads.
Indeed!!!
Scott
Drifting
Joined: Nov 2003
Posts: 1,874
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From: l In
My love affair with anti seize is deeply embedded in my soul by the number of hours I've spent getting broken bolts/studs out of aluminum. I also use a lot of lock-tight and thread sealer, but they haven't been as painful as removing broken studs/bolts and pulled out threads.
Try removing plugs from an old VW bug that did not have it on them.
