What are the torque specs on a 350 Chevrolet motor?

Low-End Torque Specs

Main-cap torque specification on the typical Chevrolet 350 two-bolt-main engine is 70 ft. -lbs. Specifications for the four-bolt-main are 70 ft. -lbs for the inner bolts, 65 ft.

What is the torque specs for the rocker arm?

For 3.1-liter engines built between 1995 and 1997, the rocker arm bolts require two steps to reach 7.42 foot-pounds of torque in order to attach to the cylinder head. For later engines, these same bolts should receive 14 foot-pounds of torque to join properly.

How much torque does a 350 SBC have?

Chevy 350 Engine Specs

Rated at up to 380 pound-feet of torque, this engine is great for towing; however, fuel economy is low and — depending on the compression ratio — it might require premium fuel.

What is the torque specification for tightening head bolts?

If an engine produces 1,500 pounds of pressure and the cylinder head has 8 bolts, then each bolt must be tightened to 187 foot-pounds of torque to secure the cylinder head to the block.

What causes rocker arm failure?

Bad timing belt or chain. A faulty timing belt stops the engine from igniting and turning over. When this happens, the rocker arms, valves, and even the pushrods get damaged. Fault from the manufacturing process can also cause rocker arm failure.

How do you tighten a LS rocker?

How do you torque a 350 head bolt?

Where do I find torque specs on my car?

Where To Find The Correct Manufacturer Recommended Torque Specs. The torque specs for the axle nut (and other nuts and bolts) should be listed in the dealership/shop guide provided by the manufacturer. If you can’t find that information, or if you don’t have a guide, you can find the specs in the service manual.

Can you over torque head bolts?

Overtightening head bolts can damage the block threads, yield the bolts, and in extreme cases break the cylinder head. Some heads are actually fitted using torque to yield (sometimes called stretch bolts), where the bolts must be replaced after use, or they loose some of their strength.

Can you reuse head bolts Chevy 350?

Can I reuse head bolts? … A head bolt should not be reused if the threads are galled or badly damaged. Chasing damaged head bolt threads with a die will clean up the threads but also remove material (metal) and undermine the head bolt’s ability to torque down and hold to specs.

How many head bolts does a 350 Chevy have?

They came in 3 different sealed packages because sbc 350 uses 3 different length head bolts. The short ones around the spark plugs, medium ones at the corner of the heads and the long ones in the other locations. The bolts have the oem style 5/8” hex head and also come with thread sealer already applied to them.

What’s the firing order on a 350 Chevy?

For the Chevy 350, the HEI Distributor Cap follows the same firing order as the engine: 1-8-4-3-6-5-7-2. On a small block Chevy V8 engine, the distributor cap firing order is in a clockwise rotation.

Are Chevy 350 head bolts torque-to-yield?

All 1995 and earlier LT-series engines use the same head bolt torque (65 ft. -lb.) and tightening sequence as the original small block. GM switched to torque-to-yield (TTY) bolts in 1996, which require a slightly different approach.

Do you lubricate head bolts?

Should I lube my head bolts or studs before installing? Yes, on all blind holes you should use some sort of lube to prevent galling and to ensure the fastener turns freely in the hole and doesn’t hang up, which would cause an inaccurate torque reading. … For non-ARP fasteners follow the manufacturer recommendations.

Should you replace cylinder head bolts?

Damaged Head Bolts

Bolts with any signs of damage, no matter how slight, should never be reused. Not only will the bolts eventually fail, but when they do, there is the potential for them to cause damage to your cylinder head.

What is a torque sequence?

Bolt tightening sequence, or torque sequence, is defined in the torque tightening procedure. Flange joints are torqued tight with the help of a torque wrench (manual or hydraulic). … Torque bolts and nuts in a “CRISS-CROSS” sequence using a minimum of three torquing passes and the maximum bolt stress as defined.

Can you reuse Fel Pro head bolts?

Fel-Pro, ASE Certified Master Technician, John Gurnig explains why you should never reuse torque-to-yield (T-T-Y) head bolts. A head bolt stretch test shows where the bolt will yield when stretched. Once stretched, a T-T-Y head bolt will not return to its original length and, because of this, should never be reused.

How do you torque down a SBC head?