- Stand facing the head you are tightening.
- Mark the top row of head bolts, using a wax marker, starting with the leftmost bolt. …
- Attach a socket matching the size of your 350 Chevy’s head bolts to a torque wrench.
- Set the torque wrench to 65 foot-pounds.
What are the torque specs for a 350 Chevy head bolts?
| Fastener Type Torque Spec | Cylinder Head Bolts 65 ft.-lbs. | Screw-In Rocker Arm Studs 50 ft.-lbs. | Intake Manifold Bolts (Cast Iron Heads) 30 ft.-lbs. | Oil Pump Bolt 60-70 ft.-lbs. |
|---|
How do you torque a small block Chevy head?
| Fastener Type Torque Spec | Cylinder Head Bolts 65 ft. -lbs . | Screw-In Rocker Arm Studs 50 ft.-lbs. | Intake Manifold Bolts (Cast Iron Heads) 30 ft.-lbs. | Oil Pump Bolt 60-70 ft.-lbs. |
|---|
What is the torque sequence for head bolts?
Torque sequence refers
ro the pattern in which you tighten the bolts
. The overall goal is to spread the torque evenly as you are tightening the bolts. Usually, you start at one bolt, and you work your way around in a circular pattern. Doing so ensures that your head won’t be warped during the tightening sequence.
What is the torque on a 350?
The Chevrolet 350 cylinder-head torque specification is
65 ft. -lbs
.
What are the torque settings for cylinder head?
Tighten the cylinder head bolts in 2–3 steps in the proper sequence. The final torque specification is
59–64 ft. lbs. (80–86 Nm)
.
How much horsepower would a stock 400 SBC with Vortec heads?
With the stock Vortec heads, the low-compression 400 managed to make
376 hp
and almost 450 lb-ft of torque.
How do you torque down your head?
- Tighten all bolts in sequence, and in two stages to a snug torque value of say, 30 Nm.
- Apply a 90 degree rotation to all bolts in the proper tightening sequence.
- Apply a further 90 degree rotation to all bolts in the proper tightening sequence.
What happens if head bolts are not tight enough?
But even the best head gasket won’t maintain a tight seal if the head bolts have not been properly torqued. …
Uneven loading created by unevenly tightened head bolts can distort the head
. Over a period of time, this may cause the head to take a permanent set.
What happens if you over torque a head bolt?
When you overtorque above 15% of recommended which in this case would be about 95 ft/lbs you
basically turn the fastener into a rubber band
. Some of the fasteners will stretch and you will have uneven torque. Add heat and pressure and head gasket blows and the head can even warp.
What is the torque specs on a Chevy 350 intake manifold?
| Fastener Type Torque Spec | Intake Manifold Bolts (Cast Iron Heads) 30 ft. -lbs. | Oil Pump Bolt 60-70 ft.-lbs. | Cam Sprocket Bolts 18-20 ft.-lbs. | Harmonic Damper Bolt 60 ft.-lbs. |
|---|
Are Chevy 350 head bolts reusable?
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 horsepower does a 350 engine have?
The Chevy 350 engine is a 350 cubic inch (5.7-liter) small block V8 with a 4.00 and 3.48 inch bore and stroke. Depending on the year, make and model of a car, horsepower ranges from
approximately 145 to more than 370.
Do you have to torque head bolts?
In short, at least here in 2020, the answer is no,
you don’t have to retorque head fasteners
, maybe. … If you catch any seeping you can try retorquing the bolts, but if anything gets between the gasket and the block or head surface it may be too late to save yourself from installing a new head gasket.
How do you torque head bolts without a torque wrench?
RE: How to measure bolt torque without a torque wrench
A long cheater pipe and a fish scale
should do the job.
How do you torque a 90 degree bolt?
90° =
quarter turn
. 180° = half turn. It’s alright if you are off a few degrees.
