Question about head bolts.
Thread Starter
Staging Lane
Joined: Aug 2005
Posts: 98
Likes: 0
Question about head bolts. I am going to torque down my head bolts and am a little unclear about something. A book I have says to crank the long bolts 22lbs, 76 degrees, 76 degrees. The short bolts on the ends get 22lbs and 34 degrees. But the book was wrong about the oil pump cover bolts when it said 18 foot pounds instead of 106in lbs. Ls1howto.com says 22, 90, 90 for long and 22, 50 for small. What is correct? 
That is the correct torque sequence. I have been using it for years without issue. I would NOT re-use head bolts. Its not worth the consequence.
Think about a rubber band....you can stretch it out as far as it will go. Right before it breaks it has its most tension and strength. This is what the torque to yeild bolts are designed to do. Torque it to its limit right before it breaks and hold it there. It is a fact that it has its strongest holding point there. Think back now to the rubber band. When you stretch it as far as you can...then let off and do it again. Usually it will break. I wouldn't want that for the trouble it would cause getting it out of the block or blowing the head gasket while under heavy load.
Think about a rubber band....you can stretch it out as far as it will go. Right before it breaks it has its most tension and strength. This is what the torque to yeild bolts are designed to do. Torque it to its limit right before it breaks and hold it there. It is a fact that it has its strongest holding point there. Think back now to the rubber band. When you stretch it as far as you can...then let off and do it again. Usually it will break. I wouldn't want that for the trouble it would cause getting it out of the block or blowing the head gasket while under heavy load.
the bolts you bought from thunder are they ARP or OEM style, because if they are ARP dont follow OEM specs. ARP straight with a torque wrench just torque anywhere between 95Nm to 105Nm depending on your application. if you are going to use NOS then torque 105Nm.
Trending Topics
Thread Starter
Staging Lane
Joined: Aug 2005
Posts: 98
Likes: 0
The people at Gearchatter have it listed in the torque specs area to do the 22,90,90 long and 22, 90, 50 short. WTF.... I would think that there is the right way to do it and there can't be two right ways.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
i did the 22 ft-lbs 90-90 and 22 ft-lbs 90-50 as shown here http://www.lastofthebreed.com/Servic...orqueGuide.htm
TECH Addict
iTrader: (6)
Joined: Dec 2001
Posts: 2,028
Likes: 0
From: sojourning....looking for my city whose builder and maker is God.
Originally Posted by mrr23
i did the 22 ft-lbs 90-90 and 22 ft-lbs 90-50 as shown here http://www.lastofthebreed.com/Servic...orqueGuide.htm
) Last edited by Lady Redhawk; Oct 13, 2005 at 11:19 AM.
the torque to yield means this...
torque until there is permanent stretch (past the yield point, or point where further increased loading would cause permanent deformation)
this point is before the actual break point, but after the bolt has actually stretched some distance. the bolts removed will be slightly longer than before.
this does not work for materials that are brittle, only ductile, or stretchable materials
torque until there is permanent stretch (past the yield point, or point where further increased loading would cause permanent deformation)
this point is before the actual break point, but after the bolt has actually stretched some distance. the bolts removed will be slightly longer than before.
this does not work for materials that are brittle, only ductile, or stretchable materials
