If you never took the bolts out haw did you replace them?

 

Weisz Erik

 

if you take one bolt and replace it one at a time you still have all the other head bolts holding down the head for you. since the head was torqued down properly from when it was first put together by the factory doing one bolt at a time wont hurt anything.

 

i have asked several times for information on these things and none has ever been offered what so ever. And im sorry if they wont hold on a fire ringed block i would never use them. Bolts with no heat cycle or tensile strength information are a ticking time bomb. its pretty bad that these things break on grader's alternator bracket....

 

Make your own bolts

These are Houdini Bolts , you'll never know the details why flood the market?

 

Houdini bolts??? There is nothing special about grade 12.9 allen bolts from your local bolt supplier, That have no intention of having a heat cycle and arent designed to hold any kind of additional load.

He didnt give me any information cuz as he told me he didnt know any of that information.

 

You really think your torque specs are still spot on after that many miles? And by releasing all the load on one bolt at a time you still effect the way the head mates to the block, the head still lifts in that one spot and does not mate back the way it should for maximum holding power. Will it work, yes... will it automaticlly break, probably not... Can it be done better and stronger. Yep. Alos how to you torque in stages like you supposed to doing only one bolt at a time? There is a reason that a procedure like this is in place and used by everyone. There are many high HP, High Boost trucks running stock head bolts holding just fine... Because they put the head on right.

 

1. grade 12.9 allen bolts
2. no intention of having a heat cycle
3. arent designed to hold any kind of additional load.

If you know all there is to know about the Houdini Head Bolts then why exactly are you posting on this thread saying you didn't get any information.

 

Because on further research after not getting any information from Tony, and Des Moines Bolt was kind enough to get me more information along with Fastenal.

Have a good day ya'll

 

if your going to swap them out one at a time, who would just torque it to the first stage and then move on seriously i hope you would have more common sense than that and finish the torque procedure.

Even on the dmaxes after you torque all the head bolts down to 125 you go back and loosen them one at a time and torque them down to 125ftlbs three more times, so i guess i ruin the even clamping force when i do that, and guess what its an aluminum head OMG its gonna warp if i do that.

Stock head bolts are strong and can be made to last a long time, one of the biggest problems is tuning and cylinder pressures lifting them up. My buddy stephen had a 12v that he ran a fatbastard turbo on it and pegged his 50psi gauge all the times, he had stock head bolts, no big deal had it for a long time with that setup and had no problems.