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My friend is in the process of replacing the head gasket, and had a few questions. As I'm no Z expert, I thought it would be a good idea to pass the questions along to all of you.

Does he need to replace the head bolts??
What is involved in doing valve seals??

Any help would be much appreciated, as well as any other tips or suggestions for him while he's got the engine torn apart anyway.

Thanks,
-Steve
 

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Genocide, it is my understanding that the head bolts stretch over a short period of time and that it is best to replace them, run the vehicle for a short while and retorque them because of their tendancy to stretch. I also understand that using turbo head bolts would be even better (either the same price or not significantly more expensive).

I have learned, from many, on this site that the main thing in disassembling a head, is to make absolutely certain that everything (all of the parts) be kept together (maybe in marked zip-lock bags or marked saran wrap) and restalled in the original place and position (in which you take them apart) to avoid destroying the cam, rockers, and lash pads, especially the cam and rockers. Also, treat the cam as you treat your jewels. Do not scratch it in any way (It is safer to scratch your jewels). There is a pattern that has already been worn into these parts that you want to keep matched up. I would use saran wrap to wrap the lash pad to its origninal rocker and in the original position. There is a valve-spring compressor that is used to compress the springs to remove the little collet from each valve to release the valve. Someone on this site (I think Tony D.) , shared a method of ushing a certain screwdriver in lieu of the compressor to accomplish this. If you can avoid, do not remove the cam towers. I you have the soft (I believe brass), this would be a good time to replace them with the hard steel ones. You may want a machine shop to do this or perhaps the entire head job. I am not an expert, by any stretch of the imagination, but have pretty good recall.

Others who read this please correct any area in which you think that I am wrong or going overboard. Ernest (140/260Z)
 

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I have just had my head repaired after a valve broke. Last night my friend and I put the head back on. We didn't bother replacing the screws. However, a neighbor advised to torque them, and then loosen them a few times to get them in nicely. I think the valve job needs certain tools and such. My uncle is a machinist and was ableto do that for me. He dipped it in some kind of tank which took off all the grease and everything. Now you can see yourself in it. Good luck, its alot of work.
 
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