background: 406 sbc, world products sportsman II heads
two weeks ago I was helping my friend finish up his upgrades to his sbc (solid cam, vic jr intake, port polish heads, new springs and rockers) So after everything was installed we primed it dropped the distributor and she fired right to life.
We broke in the cam for about 30 min holding the revs above 1500 to 2000. The car sounded mean, everything seemed to be fine. So our plan was to change the oil, which he did, and re-torque the head bolts last weekend. after he changed the oil he fired it up and it seemed to run ok, stumbled a little a died but he thought nothing of it since it was below zero outside.
So saterday we were removing the rockers and headers to gain access to the head bolts to retorque them. he had noticed a little drip of coolent and figured one of the small head bolts was probibly leaking. The passenger side came apart fine, but on the driver side, #7 inner header bolt was removed and a stream of coolent came out, not a drip or two but a stream.
We talked to some local gear heads who figured a cooling jacket could have worn through or a crack into a coolent jacket. They suggested runing a stud really hard into the hole to try and seal it up, and maybe some RTV or jb weld. They said it should run ok unless the possible crack gets bigger.
So we thought back to when we were assembling the head on the block, everything was clean and new so a lump intbetween the surfaces was ruled out. But looking back we both remembered that when the head was just sitting on the block, at just the right angle you could see light from the other side. we moved the head a little to make sur it was laying flush and it seemed ok, so we torques it down.
I guess what I am getting at is for an opinion, for sure something is wrong with the head. We dont want to take it off just yet if we only need to stud the hole. btw the heads were never decked before install, only had 1500 miles on them.
Any suggestions would be great!
two weeks ago I was helping my friend finish up his upgrades to his sbc (solid cam, vic jr intake, port polish heads, new springs and rockers) So after everything was installed we primed it dropped the distributor and she fired right to life.
We broke in the cam for about 30 min holding the revs above 1500 to 2000. The car sounded mean, everything seemed to be fine. So our plan was to change the oil, which he did, and re-torque the head bolts last weekend. after he changed the oil he fired it up and it seemed to run ok, stumbled a little a died but he thought nothing of it since it was below zero outside.
So saterday we were removing the rockers and headers to gain access to the head bolts to retorque them. he had noticed a little drip of coolent and figured one of the small head bolts was probibly leaking. The passenger side came apart fine, but on the driver side, #7 inner header bolt was removed and a stream of coolent came out, not a drip or two but a stream.
We talked to some local gear heads who figured a cooling jacket could have worn through or a crack into a coolent jacket. They suggested runing a stud really hard into the hole to try and seal it up, and maybe some RTV or jb weld. They said it should run ok unless the possible crack gets bigger.
So we thought back to when we were assembling the head on the block, everything was clean and new so a lump intbetween the surfaces was ruled out. But looking back we both remembered that when the head was just sitting on the block, at just the right angle you could see light from the other side. we moved the head a little to make sur it was laying flush and it seemed ok, so we torques it down.
I guess what I am getting at is for an opinion, for sure something is wrong with the head. We dont want to take it off just yet if we only need to stud the hole. btw the heads were never decked before install, only had 1500 miles on them.
Any suggestions would be great!