what are the torque sspecifications for a buick 455, cylinder heads?

Answer 1

I own a shop, and build a lot of engines. I'm not sure what the book calls for, but I torque them to no less than 75 ft. lbs, and work from the center out on both sides of center until I reach the outer bolts. Work in a crisscross fashion, as in top, bottom, top, bottom, while going from the center towards the front, and then towards the back from center, two bolts at a time. I start at 10 ft. lbs, and work my way up to 20, and then go to 40, 60, 70, and finally end at 75. Allow the gasket to seat for a few hours, and go back over the bolts again one last time, and you won't have any problems. A 455 makes a lot of compression, so its critical you have both the block & heads clean, check for warpage, and I use some spray called "copper coat" on both sides of the gasket, but spray on a very light coat on the block & head. This stuff fills in any tiny infrecections in the metal, and allows for a perfect seal. Shake well, and use two thin coats on each part, allow it to become tacky, and then install the head. I've built probably in excess of 2,000 engines, and used this stuff on 90% of them. I have had very good results with this stuff, and I know most gasket companies say to not use any sealer, but this stuff isn't really sealer, its more like paint, and fills the tiny spots for a perfect seal. I use it on the intake gaskets as well.
Glad to help out, Good Luck!!!

Answer 2

What year?

Answer 3

Can't you access a manual with your search engine?