12valve

i blew the 2nd gen HG (unmodified) that we put on the CR (in my sig)
That was with no more then 60 psi boost and no water or meth or Nitrous

could i go with a CR HG while whaving small orings? or should i modify the 2nd gen HG and/or head, to make it work?

Thanks

Howling

2nd gen gasket that is cut for the rings.

12valve

the head has very littly sticking out rings, just to seal the gasket around the cylinders, not like fire rings

ronnyenns

I think a stock CR headgasket should work because the o-rings are very small, but i dunno, anyone?

Jetpilot

Contact PDW as they have the modified 12V marine gasket for the CR engines using o-rings.

Doug

tcr

I've always heard it's best to use a stock factory gasket when o'ringing a head on a CR, that's what I have and Hamilton Diesel did my headwork. There wasn't even an option in his book.

12valve

Tom, you mean a factory CR gasket right?

tcr

Yep, that's I've got and I've heard a few say to use.

Jetpilot

The problem with the stock CR HG is the fire-ring is not round. Therefore the wire doesn't set even on the fire-ring. Also the choices in wire sizes are limited due to this. I have found that using the 12v marine gasket affords a good seal, uniform fire-ring clamp load and several choices for wire size.

I am not saying that using the stock mls gasket is bad, just that I prefer the 12v modified gasket...... Just my $.02 worth

12valve

thanks jetpilot, cant i modify a stock 2nd the HG? what has to be done to it?

Id probably order one, but shipping would take its time, specially since im in mexico, and id like to put it together as soon as possible.

But anyhow i wanna choose the best

Snapoff

Not sure why you are running an o ring on a common rail, but you can not use a multi layer gasket with an O ring setup.

Jetpilot has it right.

FYI I have 30,000 miles on a daily driven 800+hp common rail and over 30 passes on 2 big stages of nitrous (est 1000+hp). I have had zero head gasket issues.

Save the O rings for the 12V's.

wap

What are you doin to keep the head clamped down?

Big C

i run a o ringed head and a 12v marine gasket and have had no problems for two years now and i run about 65 to 70psi of boost on it all the time. i blew 2 mls gaskets before i went to the 12v gasket

cquestad

85 psi everyday on a OEM MLS with properly installed ARP 2000's.

12valve

How do you install the ARP studs properly?

i followed the sequence specified by cummins first round to 80 lb second round to 95lb then 110 then 125 then 130

more and more opinions, i jsut get more and more confused, i thought the OEM MLS HG was pretty good.