What are the differences between the two cylinder heads?
I am currently working on my 235k mile 1999 Avalon that has the non-vvti heads and apparently it appears this engine was poorly neglected or poorly maintained. I'm currently dealing with possibly a multitude of problems. A possibly blown head gasket and two burnt up exhaust valves for cylinder 2. It seems that at some point this engine has had either a coolant leak or signs of blown head gasket, and that I'm guessing the previous owner(s) or mechanic(s) tried to fix it by pouring/mixing in one of those Bars Stop Leak products in the coolant. There are traces of grey substances in the cooling system everywhere after partially disassembling the engine. There are also signs of ridiculous amount of RTV used for valve cover gaskets and lack of regular oil changes. This engine does leak oil, and now coolant is mixing in with oil.
Quick story about this car...
I bought this car back in November of last year and everything was running and driving fine till about a week ago when the engine lost power, was pulled over to the shoulder on the highway, and upon opening the hood, steam was coming out from both the driver and passenger side of the engine. The rubber sealing gasket in the radiator cap had deteriorated and lost cooling pressure and lost coolant as well. Car had to be towed back home. I read a couple of codes which few of it stated misfire in cylinder 2, an ignition circuit code (forgot the actual p-code), and a P0115 (coolant temperature circuit malfunction). Other codes were for emission control devices such as the EGR and Evap which has been there long before, and there was one transmission code.
I have confirmed there's spark (waste ignition spark system) and fuel in cylinder 2. I did a quick dry and a wet compression test and only got 30psi which tells me the piston rings are fine but there's definitely an issue with either the valves or the head gasket. My friend brought his air compressor and his leak down test over to help me out dig in with more troubleshooting. Because it was a windy day I couldn't properly hear air gushing out from the tailpipe, but the test did indicate severe air leakage in that cylinder. For the past few days, I tore down the engine to pull the bank 2 cylinder head out to discover and confirm my suspicions as shown in the pictures below.
I am now in need of another cylinder head and this is where I need some help in figuring out the differences between a vvti and a non-vvti head. Can I swap in a vvti head or is that impossible and won't work on my car?
Condition of the head gasket.
I see tiny holes in between cylinder 2 and 4.
This is the underside (facing towards the engine block) of the gasket between cyl 2 and 4.
Burnt exhaust valves cylinder 2.