ls1blazer

iTrader: (6)

Engine is a ly6 with VVT delete. Installed a GT11 (215/231 .631/.644 ) cam. .650 dual spring valve springs and 7.4 pushrods. Stock lifters/stock rockers with trunion kit.

1st start up at idle offset rockers walked their needle bearings out hence the trunion kit.

2nd start up at idle ( to operating temp) after trunion kit install, broke 4 off set rocker studs. Am I missing something here? This should be a simple straight up install.

No bent pushrods.

Odd that its just the offset rockers. Is it too much pressure causing them to get in a bind?

romancommander

iTrader: (1)

Did you measure the install height of the springs? Did you measure the push rod length? how did you arrive at 7.4?

ls1blazer

iTrader: (6)

Didn't measure the spring height . Pushrod was measured with pushrod checker. Springs are BTR .660.

ls1blazer

iTrader: (6)

Found broken spring debris as well. Looks to be the smaller ones. I'll just have to tear it down and check the valves too.

romancommander

iTrader: (1)

My guess is install height of the springs was off causing coil bind before max lift.

ls1blazer

iTrader: (6)

My uderstanding was the springs were suppose to be direct replacement for the factory ones. Still odd it was only the intake ones.

romancommander

iTrader: (1)

Doesn't matter you still need to measure the installed height to insure you have enough travel.

WE TODD DID

iTrader: (2)

Broke springs = coil binding. You can't take anyone's word on anything with the fitment of engine parts. You always have to verify that what you are installing is correct. Other people make mistakes and you pay for it, literally.