INVISIBLEZ

iTrader: (45)

13,000 mile motor never street raced, or been to the track. It was completely stock. I was selling it, so we pulled it out of my car. We bolted a set of Patriot LS6 heads on it and put a C1 MTI cam in it from the buyer. We put the engine in the car last night and drove it 3 miles down the road, come to a red light sitting there @ an idle and all of the sudden it sounds like a jackhammer jumped in the engine. Now I know you alls first thought would be these guys pulled out of the driveway and hammered on it, quite contrary, we never took it over 3000 rpm's. I am @ a loss, and on top of that disgusted!! Can anyone give me a theory on this. The pushrods were checked, along with the springs, and rockers, so it's not valvetrain. Just a side note the engine was also never sprayed, Just answering a future question.

zo6vetteman2003

iTrader: (1)

Hmm, I can't imagine it being something that deep. It may be possible that there could have been coolant or oil in the head bolt passage before torqing it down. The result would be when the engine got warm, that fluid needed to expand and cracked the block. That is the only thing I can think of. Good luck in finding the problem.

INVISIBLEZ

iTrader: (45)

No we put in the good 7.4's. I couldn't tell you what brand, they were part of the buyers parts he had for the engine.

zo6vetteman2003

iTrader: (1)

I thought it was a pushrod at first, sorry but I saw you checked those. Go back and check my post above again...

INVISIBLEZ

iTrader: (45)

We cleaned all the head bolt holes and blew them out completely with an air blower before installing the new heads. Guess I should mention this is a 6.0 liter.

zo6vetteman2003

iTrader: (1)

Ah, well that sounds like it was all done correctly. Hopefully someone else may have had this problem. Another theory could be valves crashing the pistons and a failure occured. It maybe best to pull the heads and get a look if nobody has an answer. Hey did you use a thicker head gasket to avoid this possibility?

INVISIBLEZ

iTrader: (45)

I think the engine will be out of the car this afternoon, I'm just waiting to see what my friend Jeff wants to do. On the head gaskets I'll have to ask Jeff, he'll chime in shortly.

zo6vetteman2003

iTrader: (1)

Good luck! I know the Vortecs have some clearence issues with the valve and pistons with an aftermarket cam. Sounds like you have it under control and I wish you the best. I'm sure you guys have already checked the oil and coolant for contamination. Just a thought. A thicker head gasket is not the best solution just to let you know about that comment. It will increase combustion chamber volume and decrease compression, but aviod a clearence issue.

BigBake

After putting the new heads and cam in did you drain the oil pan and flush the engine out before re-filling it with new oil? Sounds like you had residual coolant in the oil pan, or one of the head gaskets allowed coolant to get into the oil.

Inspector12

iTrader: (29)

No coolant the oil is still to this minute honey in color and clear. And it still old good oil presure. That is the perplexing thing I would thing with a spun bearing of any kind there would be a change in the oil presure if not total loss. We put a clutch in this car also a Spec3 has anyone ever had one make a knocking noise to mimic a rod knock etc?

INVISIBLEZ

iTrader: (45)

That would be nice, I'm about to pull my hair out!!!!!!!

WAHUSKER

iTrader: (4)

Just curious, did you tune it after all those mods? Detonation has been known to spin bearings. Check the spark plugs for the tell-tale pepper coating.

goober35

iTrader: (1)

Did yall put a new timing chain on it or did you pull the oil pump. If you did i bet you did not put the O ring on the pick up tube properly if at all. No oil presure=no motor.

INVISIBLEZ

iTrader: (45)

The car was already tuned, the only thing that change was 5.7 to a 6.0

INVISIBLEZ

iTrader: (45)

No to both questions, it runs 40 p.s.i. @ idle and 60 p.s.i. cruising down the road.

goober35

iTrader: (1)

Have yall drained the oil yet. If you have with i would think u would. Look at the oil plug. If you spun a bearing it shoul look like a nasty *** fungas. Also the oil you pulled out before you did the cam swap did it look like it had a nice fine power in it.

Just trying to figure out if you have a spun on or not.

blacktransam

iTrader: (13)

could be the throw out bearing.. when a buddy of mines went it actually took a finger off the pressure plate.. sounded like a horrific rod knock

xttc2000

stupid- but does it have cats? and have you checked them?
i blew out a cat and it scared the crap out of me- thought i threw a rod.

also bolts on the flywheel backing out could sound like it too.

Boosted One

iTrader: (6)

What about the cam retainer bolts. I think they are 2 different lenths, and if you put the long one on the bottom it will hit the front of the crank.

Frank

INVISIBLEZ

iTrader: (45)

No cats