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Old 03-22-2005, 07:58 PM
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Help with the torque specs

Needing some help guys. I am putting my 350 back together and when looking at the book for the torque specs I am getting a few different things, so I'll ask you guys who do it all the time....One book says 70lbs. Another says 3 steps, 25lbs, 45lbs, 65lbs. The latter sounds more logical. I know the sequence just not how much to tighten and 5 lbs. can make a difference. Also I have heard different views on a gasket sealer. Some say not to use any at all. Others say to use the copper spray sealer. One of the Haynes books say that if the manufacturer doesn't specify then to use the spray sealer. I haven't rebuilt an engine in 20 years probably so everything is kind of escaping me at the moment. A couple of guys I talked to I mentioned the head bolts. They said clean them and reuse them. I cleaned them and after looking them over I decided to get new bolts as the threads one these look a little "grainy" from where they have been cleaned before. So I don't want to take any chances in that area, and for no more than what they cost, I'll go with new. The engine only has 1600 mi. on a rebuild and is a .030 over 350, but I have torn it all the way down except for the pistons, rods, and crank to put all new gaskets in it. Everything is good to go all back together except when it comes to the head bolt torque figures. So bear with me....I will probably have quite a few questions before this is over.

Kevin

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Old 03-22-2005, 08:04 PM
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I torque them to 70 ft.lbs in a 3 step sequence like the one you mentioned, only the finaly torquing being at 70 instead of 65. I dont use anything on the headgaskets. I also chase the threads in the block with a threadchaser to clean them out before inserting the headbolts.

If you reuse old bolts, you should reuse the same bolts in the same holes. Seeing that you are using new ones, that is not a concern.
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Old 03-22-2005, 08:52 PM
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If you're using composition head gaskets, I wouldn't use anything.

I think you are smart to buy new bolts if you have any doubts. It saves on those haunting feelings you get just before you go on a long trip. I also use sealer on the threads because they live in water.
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Old 03-23-2005, 02:09 AM
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Thanks guys. 70 it is in a three move with no sealer. I already chased the threads to get all of the old sealer out so as to get proper torque. I'm picking up new head bolts tonight. After looking the others over there were pits in the sides and like I said before the threads looked grainy. So I imagine they have been used a few times. I don't want to take a chance of getting it together and something go wrong.

Kevin
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Old 03-23-2005, 05:09 AM
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I do the above and I dip the threads in oil as I put them in. I have never had a problem with used bolts.

A friend used to put SB heads on with an impact gun. He had the theory that it is the same torque all the time, so they should be even..................he was a Ford guy, what do you expect.
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Old 03-23-2005, 02:27 PM
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you probably have the heads on by now.

I use a spray on glue called Hi-Tach on the head gaskets. Use rtv on the bolt threads otherwise water will creep up the bolt holes. The silicon lubricates the threads as well. I torque my heads in 10 lb increments. It keeps the head bolts from getting hot and binding during torquing.
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Old 03-23-2005, 02:51 PM
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Seal the lower bolts where you do not get a coolant leak Kevin.Nothing turns that job to crap quicker than a coolant leak.
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