Mohavvalley

On my old heads the exhaust ports where corroded, the manifolds leaked and the previous owner ground 2 lobes off the cam, I'm thinking this was all from salt water reversion. The internal stainless flapper on the driver side exhaust tip is mostly gone and that was the side with the most water damage in the cylinders, number 8 in the back being the worst. So I'm sure that didn't help but I'm thinking that was not the sole cause of all the water damage, and it was mostly reversion due to set up?

So to try and fix this I already have brand new in the box hardin OEM merc replacement manifolds AND I'm looking at going with a Gil high rise manifold top (off of like a HP500) VS the Gil low rise it has now. I can make the change for $250 to $300, would it help with the reversion or am I just wasting my money switching tops?

-(Looking at the lunati cam 20110669 -Adv: 293/303 @.5-234/244, -629/612 Lift, and 114*Lsa)

Here's what I have


Here's what I'm looking at switching to:



Will the switch help with the reversion or is it a waste of money and cause other problems?

Thanks

Crude Intentions

iTrader: (1)

Griff

They will help reduce reversion. Merc switched to them for the HP500 carb engines because of reversion issues on early HP500's.

Not sure if reversion actually caused your corrosion issue though. More than likely, it was just the bad manifolds.
I had Gils get hairline cracks at the top dividers on my 525SC and had rust and a couple pitted valves. Mine were hardly even leaking and you could barely see the cracks.

That being said, for $200-300, I would swap to taller ones just to be safe. Make sure they will clear your hatch.