warped intake valves
 

502 mpi engine with only 45 hours since heads were redone but now everyone of the intake valves are warped. Any ideals what causes it? Machinist said they are the heavy duty valves.

What other work was performed when heads were done?

Let’s see one. Can you post any pics?

What do you mean warped? Bent?

New inconel exhaust valves, new springs, roller rockers, 500efi cam, heads resurfaced, seats ground, block line honed, torque plate honed, decked

sorry i never seen the valves just going off the machinist.

Was cam installed straight up? Was block zero decked, or just cleaned up?How much did they mill heads?
If cam timing was advanced, you may have run out of piston to valve clearance.

Block was just cleaned up and make sure both deck heights were the same. I don't remember how much off the heads but not much and original heads. I put cam in straight up and mocked it up and measured valve clearance but that was 4 years ago and don't remember how much

Warped or tuliped?
Intake valves usually won't tulip.

I have seen that in a lot of small block heads but cant say I have ever seen it in Big Blocks. They are tuliped which I suppose some people call warped. I know if you are getting water in the cylinder they will definitely do it. When I do a set of small block heads i almost always put stainless intakes in them.

I think you need to have your machinist verify if they are "warped" or "tuliped" big difference in the causes. And a picture would be nice :)

Just another thought ...... how long ago were they done ?

https://cimg8.ibsrv.net/gimg/www.off...8f02713a85.jpg
I couldn't get a good picture and laying the valve on the table it didn't rock. I have 4 short seasons and about 45 hours on it. He did put stainless intake valves in it this time i just didn't want it to happen again.

Cant really tell anything by that picture but if the engine was built 4 years ago and you only have 45 hours on it I was wondering if the fuel is old and turning to glue and holding the intakes open ? I have seen it more times lately than I can count. Or if the fuel is getting bad enough it can cause detonation which will also affect the valves.

Just thinking out loud :)

BillK you obviously dont know what you`re talking about .
I filled up with bad gas (basically laquer) and 5 minutes later my intake valve didnt intake so much anymore but when i posted the pic I was told bad gas doesnt do that , Im wrong and its something else .. just a coincidence.lol

https://cimg5.ibsrv.net/gimg/www.off...9e11b4c778.jpg