Are small block Chevy head bolts torque to yield?
For the LS2, torque all of the A and B bolts (the long bolts under the valve cover) to 22 foot-pounds in sequence, then turn all of the A and B bolts 90 degrees in sequence. Make a final pass in sequence and turn them an additional 50 degrees.
What happens if you over torque your head bolts?
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 are the torque specs for a Chevy 350 engine?
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.-lbs for the 7/16-inch outer bolts, and 40 ft. lbs. for the 3/8-inch outer bolts.
How big is the 350 Chevy head bolt?
350 Chevy Head Bolt Torque Specifications by Richard Rowe Chevrolet’s 350-cubic-inch powerplant is the flagship of the company’s seminal small-block engine line. The original small-block 350 remained essentially unchanged for nearly 40 years, until the LT came along in 1992.
What’s the torque of the head bolt on a 1995 Chevy?
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.
How much torque do you put on a head bolt?
For the LS1/LS6, torque all of the fasteners in sequence to 22 ft.-lb. Then, turn all bolts in sequence by 90 degrees. On the next pass, turn all of the bolts in sequence except for those on the front and the rear of the head by 90 degrees.