Thread: Simple engine mod question

Tweet

Code L31, found in '96-up Vortec 5700 motors.
Here's how to look for 'em in a boneyard............
http://www.chevymania.com/tech/vortec.htm
Pull the valve covers and verify the casting numbers before layin' down your green.
Remember, the stock retainers/springs are only good for a theoretical valve lift of about 0.450" before the retainer slams into the stock seal. And by the way, the stock seals may not be fully seated on the boss. Use a socket to tap 'em down to be sure. If you're gonna go any higher on lift, replace the springs and retainers with the Crane Cams kit #10309-1 springs and retainers, good for 0.550" lift with no machining. Just drop 'em in using the stock seals.