What are the torque specs for a 350 Chevy?

Top-End Torque Specs The Chevrolet 350 cylinder-head torque specification is 65 ft. -lbs. The intake installed onto cast-iron heads requires 30 ft.

How do you torque a Chevy 350 head?

The tightening of Chevy 350 cylinder head bolts must always be done in a helical sequence, starting from the center bolt and working outwards in a clockwise spiral. It’s best to first tighten all the bolts to 25 foot-pounds, then 45 foot-pounds and finally 65 foot-pounds to maintain uniform pressure across the head.

Why do head bolts stretch?

Stretched Head Bolts Bolts are designed to stretch as you torque them into place, and when you remove them, they snap back to their original position. Because of this, many standard head bolts are okay to use more than once, as long as they have not been stretched past their spring back point.

Do head bolts need washers?

Well, yes. Without washers, you won’t get the correct bolt tension. That is because some of the torque that you apply just goes into galling the head, rather than tensioning the bolt.

ARP’s are FINE to re-use, they are NOT torque to yeild fasteners, and the heat cycles and burnishing from the torquing will actually make them MORE reliable at keeping their torque.

Do SBC head bolts need washers?

You must use hardened washers made for the job if you use them. Yes, the do keep from gouging the head. They also give you more precise torquing of the bolt.

Do I need to Retorque head bolts?

In most cases you don’t need to retorque head bolts or studs. Always use lubrication on your head bolts and studs. Make sure your fasteners are clean and the holes are free from debris. Use a thread chaser, and not a tap, to clean out the holes in the block.

What happens if head bolts are not tight enough?

If the head isn’t torqued down properly, then the most likely failure is of the head gasket, which could lead to loss of compression, the mixing of oil and coolant, exhaust gases getting into the oil ways or cooling channels, erosion of the cylinder head, overheating and warping of the cylinder head.

Should you grease a head gasket?

especially head gaskets, head gaskets are specifically designed not to use any form of sealant, if you use grease, put engine back together and start it the grease will melt and will burn a track in the head gasket and before very long you will have to replace the head gasket again, the only exception to using a …

Should you OIL new gaskets?

Adding oil can make it a pain to keep the gasket in place as well. Sometimes I go as far as using gasket adhesive and spray it down so it will stick. Only use oil on rubber O rings or as the manufacture specifies.

I myself will use grease/oil to coat gaskets before putting them in place, EXCEPT the head gaskets which I put on dry. The benifit of oil/grease besides making it easier to “stick” the gasket in place is that the grease/oil will seal up micro pores in the metal and gasket and aid sealing in some cases.

How thick should gasket paper be?

0.15mm to 1.5mm thick ” 1mt wide ” other thicknesses on request. An inexpensive oil and fuel resistant gasket paper that’s used in all sorts of applications where mating flanges are flat and good overall face compression can be achieved.

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