Engine knock and don’t know what it could be

[petethepug]

The 6.0 was just another temp option with less work vs the 5.3. More hp/tq and poss flex with Reg gas. If you can save the mighty L9H, do it.

Price aftermarket heads vs having the OEM serviced. The significant flow will free up hp with little to no effort with a mild cam. Just enough to enjoy but not tweek the reliability of the rest of the drive train.

You should pick up a few mpg too. The 6.0L is a win for the 5.3 owners as well as the 6.2 owners that need something for short or long term on a budget.

 

[j91z28d1]

The heads are not damaged surprisingly but I am set on rebuild no matter the costs. Just had the cylinders checked and they are not severely damaged the shop said they can go .20 on the bore to clean them up.

that's good news. I saw the valve mark in the piston, looks like it had been hit repeatedly and figured it was jammed back up in the head.

I broke a cranks once, not an ls. but right behind the timing chain gear on the snout. (super charger and to tight a belt) at high rpm. so the pistons slowed down at one speed and valve trail slowed down at another. it bent ever intake valve over and jammed them on the head.

it was ugly. glad it's all fixable.

 

[jonawhie61989]

Better rein 'em in to only 0.020. Unless you're getting some much bigger pistons....

0.020 might be what he meant I’m not in tune with machining but he said I would have to go up one piston size from standard

 

[Fless]

Don't mind me, I'm just busting your chops 'cause I'm a detail nerd. One up would be 10 thou.