I just recently did head gaskets on my 05 lly at ~135,000 mi because i had a hard upper radiator hose along with puking coolant out the overflow anytime I filled it. I found the rear cylinder on the passenger side seemed to be the culprit (cyl #7).
I cleaned the block with a fine scotch-brite pad for the thick stuff and then wet sanded with wd-40 and 600 grit till everything felt nice and smooth. Heads went into a local shop and had 0.003" removed, also pressure tested good. I bought the seal/gasket kit from merchant, including the ARP studs, so pretty much every gasket was replaced. I also replaced valve stem seals while I had the heads torn down. While re-assembling the heads, I found and replaced a bent intake valve from the passenger side front cylinder (cyl #1) I couldn't see any other damage. I set valve lash to 0.011", manually turned over engine a couple revs and checked and reset if necessary, repeated that until all felt good. Every thing was cleaned and assembly seemed to go well. Cooling system was filled with straight water, ran for about an hour until good and warm, drained water and filled with 50/50. Drove around it around town (~30 mi) and changed the oil. Ran well, with no leaks. Drove it to work and back (120 mi) on Friday. It then sat overnight, noticed some coolant coming out of top radiator hose to radiator connection, tightened hose clamp. Saturday drove it to town on some errands (~20 mi) and got into the throttle hard for the first time. I got home and popped the hood to check things out. Noticed some coolant coming out the overflow, but no leaks anywhere else. Sunday morning the top radiator hose was hard again. didnt have time for anything else. Got back from a business trip Wednesday night and popped the coolant cap, there was still enough pressure in there to blow the cap off into my hand and spit coolant everywhere, even after sitting 4 days in 20-30 degree weather.
So my real question is where did I screw up? Did I miss something? I'm not sure where to even start looking right now.
I cleaned the block with a fine scotch-brite pad for the thick stuff and then wet sanded with wd-40 and 600 grit till everything felt nice and smooth. Heads went into a local shop and had 0.003" removed, also pressure tested good. I bought the seal/gasket kit from merchant, including the ARP studs, so pretty much every gasket was replaced. I also replaced valve stem seals while I had the heads torn down. While re-assembling the heads, I found and replaced a bent intake valve from the passenger side front cylinder (cyl #1) I couldn't see any other damage. I set valve lash to 0.011", manually turned over engine a couple revs and checked and reset if necessary, repeated that until all felt good. Every thing was cleaned and assembly seemed to go well. Cooling system was filled with straight water, ran for about an hour until good and warm, drained water and filled with 50/50. Drove around it around town (~30 mi) and changed the oil. Ran well, with no leaks. Drove it to work and back (120 mi) on Friday. It then sat overnight, noticed some coolant coming out of top radiator hose to radiator connection, tightened hose clamp. Saturday drove it to town on some errands (~20 mi) and got into the throttle hard for the first time. I got home and popped the hood to check things out. Noticed some coolant coming out the overflow, but no leaks anywhere else. Sunday morning the top radiator hose was hard again. didnt have time for anything else. Got back from a business trip Wednesday night and popped the coolant cap, there was still enough pressure in there to blow the cap off into my hand and spit coolant everywhere, even after sitting 4 days in 20-30 degree weather.
So my real question is where did I screw up? Did I miss something? I'm not sure where to even start looking right now.
