SonicBunny

Eddie,
If you dont mind.. drop us a PM on price for the valve springs, seals, and retainers? We will be pulling the heads off in the late winter then know for sure what is needed.
thx
amy

SonicBunny

Will do.. thx

JaayTeee

Have the heads crack checked first.

That may change your mind on what you do.

All 4 of mine were cracked in between the seats.

Young Performance

Will do Amy. I will send it in just a bit. Thanks,
Eddie

Quinlan

iTrader: (1)

I went with Alum heads on my rebuild 575s

MER Performance

If you are set on using the cast heads and the valves somethings haven't been mentioned: I would check all the valve stems for wear, I then would measure the clearence between the valve stem and the guide, which is as cast into the head. If they are worn I would stay away from guide liners and go with a solid bronze guide that has a step. I would run .0015 clearence on a 3/8 valve on the intake and
.002 clearence on the exhaust with a teflon seal with the steel ring removed from around the valve stem. If your valves are worn or you replace them then you can go to 11/32 valves since your'll have to replace the guides anyways. I would inspect the valve seats for cracks or corrosion pits to insure the valve job isn't going to sink the valves into the heads. seats are from 4-6 $ each labor varys, guides are about $18 -$20 each installed.
I believe all of our Ti, is imported now either from Russia,or Japan, it varys on which material spec is called for by the manufacturer. The material is also cerified and has to pass test. C.V. Products certifies all of its material in-house. The days of retainers at $100 are over with. I would leave the retainer up to the engine builder or someone like RM Builder, to decide for you.

SonicBunny

When rebuilding these heads, does everyone go with mercury parts or aftermarket? We've heard that mercury cost more $$$ with the same reliability as crane, ect....

Young Performance

Go aftermarket. Merc. isn't making any of these parts. All they are doing is marking them up. You can buy better parts for the same or possibly even less money then if you bought from Merc.
Eddie

Dean Ferry

Sonic bunny,
Not to steal your thread or anything, and I'll be watching this thread with alot interest, but I have a HP ?

How much Reliable HP can made from the Mercury 575SCi and still run 93 octane?
thanks,
Dean

Quinlan

iTrader: (1)

Mine are a little under 650
and OH HE!! they sound good!