New to Corvette ownership

[Jerry W.]

Re: New to Corvette ownership

This is a real stretch....But an earilier pic of your engine shows a hose on the rear center vacumn port of your carb ( which i'm not familar with )......a later pic of your lifter galley shows a nipple on the road draft tube at the rear of the block that i'm not familiar with....perhaps the California crank case vent option.( that i'm not familair with )

Could it be that the hose at the carb. large vacumn port is pulling condensation thru your road draft tube back into your engine thru the carb ?....Just a thought.

[David H.]

Re: New to Corvette ownership

I have stopped the dissassembly of the block at this point. It will be going to someone that knows more about the process and what to look for I think. I really appreciate all the input and direction. I will keep you posted.

[Stan E.]

Re: New to Corvette ownership

David, Stock truck pistons are identical except for a .100 higher wrist pin location, weigh the same and will lower your compression ratio 1 point allowing full ignition advance.

[Duke W.]

Re: New to Corvette ownership

Some of the statements and suggestions in this thread by relatively new participants border on preposterous.

This TDB has a ten year knowledge base. Some of you need to spend time researching it.

Duke

[David H.]

Re: New to Corvette ownership

OK, here is a theory that Nate (my nephew the mechanic) has come up with that makes some sense.
He agrees that the ridges in the top of the pistons looks like valve damage but non of the valves are showing any damage. He thinks maybe someone over reved the engine as was suggested here and floated the valves causing the damage. Then had the engine pulled and a valve job was done. The pistons were pulled and checked and then put back in. Thus the markings on the rod caps.
We were unable to detect any cause of the coolant in the base like a cracked block or head or even a blown head gasket. The intake gasket was a slight possibility but not definate.
I appreciate any and all input or suggestions and understand that it is up to me to sort thru them and determine viability of said suggestions. I definately will do my homework and search on the archives for help. That has already been a big help with the whole octane issue.
Thanks to all again,

[Duke W.]

Re: New to Corvette ownership

That's a viable theory. Those forged pistons are pretty tough and can take a lot more abuse than cast pistons, including hypereutetic. Better engine shops have equipment to pressure test the block and heads - also sonic checking equipment and Magnaflux.

Duke