O-ringed head?

[1911 guy]

Bear with me please. Ive been out of the loop for a while, just now getting back into this. Im building up my truck with an ultimate goal of 800 on fuel/water/alcohol. Trying to get this done using a big single. Now im wanting to do something that will reduce HG failure. Ive read that o-ring is better for street than fire ring. Whats the diference? How much should i expect to pay for the machining and what type of HG do i then use? Plus are there any draw backs to this procedure? Thanks in advance for yalls input.

 

[homewrecker]

I have read many times o-ringing is better for a daily driver but can't give info as to why.If this is for your CR headstuds and a stock MLS will hold but if you are gonna go the o-ring route I'm pretty sure you have to run a modified 12V gasket. I just had a 24V head decked and o-ringed for $275

 

[Bobcat698]

Here is an explanation I wrote up on O-Ring Vs Fire Ring:
Fire Ring versus O Ring Cylinder Head Dodge Cummins Diesel

I feel pretty neutral on either. O-Ringing is usually cheaper in the long run and I believe you are within the limitations at 800HP, but, you do have to buy a modified gasket to o-ring a commonrail, so the price gap is smaller than with a 12 or 24 valve.

You'll have to have your head surfaced before you do either. This will cost anywhere from $90-$150 most likely.
To have the rings cut for fire ring, you are probably talking from $300-$500 depending on the shop.
O-Rings would probably be similarly priced.

Let me know if I can help you with your project. We can have all the machine work done here if you cannot find someone nearby to do it, but shipping is pretty pricey.

 

[Big Swole]

My CR is o-ringed and WAS (see my carnage thread) holding right at 800 just fine...Even with Stock head bolts....I recently purchased ARP 625's though..

I just use a self modified 24V stock thickness gasket....