Head break-in??

[johnathan1]

I just had my head rebuilt, do I have to follow a break-in period, and drive like a granny?

 

[lagged]

no.

 

[Racefiend]

just recheck head bolt torque after ~ 500 miles

 

[rakkasan]

I just had my head rebuilt, do I have to follow a break-in period, and drive like a granny?

There's a good chance that you'll develop valve chatter after a few hundred miles. If so, you might have to re-shim them.

 

[Racefiend]

^^forgot about that. Check your valve clearances when you check your bolts while you're at it.

 

[johnathan1]

valve chatter? why?

 

[Stretch]

The valves will re-seat a bit unless you didn't cut the seats. When they re-seat they will throw out the valvelash a tad. Say you have it at 10 thousanths, it might go down to 9 or even 8.
eric

 

[IJ.]

7M's you usually add some lash ie: if you want 10 thou you set the new head to 13 thou and it will close down to 10.

If you set 10 it will close down to 7.

 

[johnathan1]

wow, just great... someone should make a sticky with all info like that little bit you just told me, it would save others MUCH time and money... hmm, just a thought.

Kinda like how i had to remove my head after it was on, because I didn't have any clue that you are suppose to put RTV silicone in between the head and block at the front.

 

[Stretch]

Where specifically do you put that silicone? I always got confused looking at the diagram on the online manual. I need to know exactly where it goes.
eric

 

[johnathan1]

umm, i just put it in the two spots where it says to put it, and accross the front, just to be safe.

 

[Jason T]

Where specifically do you put that silicone? I always got confused looking at the diagram on the online manual. I need to know exactly where it goes.
eric

You RTV the join betwen alloy cover and block

http://www.cygnusx1.net/supra/library/TSRM/em/EM_55.html