Rookie

Are you gaining oil/water? Is the milky oil all up the dipstick or are you seeing condensation on the head and top end components after a long idle? There is a difference. I get condensation with my aluminum heads and low water temps. I use to think it was reversion and I had Stainless Marine TRS dry to the tip tails.

MILD THUNDER

Scott, you could weld extensions on to your current tails, and make them fully dry to the tip.

ctuck0659

I've got 540's with 500EFI intakes and cams. I bought some like-new Gil HP500 risers not realizing they had reversion issues. They're so low and therefore the drop is so minimal it's a wonder to me that they could work with any set-up. After wasting a lot of money trying to fix them I finally had the inner tubes extended through the transom to make them dry. Problem solved. They're a little loud, but with slip-in mufflers it's not too obnoxious. Based on my experience, I wouldn't waste my time trying other alterations or band-aids like timing changes etc. If your Gil manifolds have been fresh-water only I doubt they're the problem but they aren't hard to pressure test.

SB

Good to know.

Do the SM tails for the Gill's have their 'Dam' in them like in their tails for their own manifolds ?

ezstriper

no silent choice on right ? if no, exhaust will need to be changed

Full Force

Would sound sweet too lol

LAKE EFFECT

I run 27/28* locked initial timing with a 900rpm idle in neutral(6M MSD). It has a super strong idle in gear. Not sure if the higher initial timing causes more reversion or not, seems to be a little controversy about it. Not here to argue. I know there are better ways to control my timing, but this works and runs real well.


LE

LAKE EFFECT

The problem that arose this year was that the oil actually got milky after the extended idle times. The oil surprisingly cleaned up very well after running at operating temps for 20mins or so. I do however get some condensation on the bottom of my breathers also, which I attribute to the low water temps this combo runs, but those too clean up after running at temps for awhile.

I'm sure with the HP525 cams and the OE 500HP Gils that there has to be some reversion, and I figured there was. It just never seemed to present itself over the past, and I guess I didn't worry about it. I'll be looking into new risers and or modifying the ones I have.

LE

LAKE EFFECT

Nope, just OE HP500 risers from 98'.

LE

LAKE EFFECT

I plan on pulling the exhaust, inspecting and pressure checking both systems. I also had O2 bungs welded into all 4 risers awhile back, and I want to make sure no cracks or failed weld happened as well.

If all looks good with the risers, I think I will have some extensions welded into them.


LE