If an MLS gasket is leaving an indentation in a head the head is already annealed and junk and shouldn't have been used for a high HP build to begin with....
The Ultimate in Head sealing would have to be gas filled Cooper Rings but the close bore spacing of a 7M rules them out and is why I...
My Crank shop used their CNC to do the work based on a Cosworth counterweight profile, we removed as much as possible without upsetting the inherent balance of the I-6 crank.
Once you get to this point it's a bit of a juggling act weight wise, remove too much and you get a funky balance...
Ryan: I was wondering when you posted that's why I replied.
(I know you're smart enough to know if you can't see a gauge it's useless so wasn't getting the display in the radio hole, thought you'd gone all Hommer on us ;) )
http://ij.supramania.com/sdl02.jpg
"others" are wrong.....
Anything over 5mm and you risk coil bind in the spring and uncontrolled pressure spikes when the oil is coldNthick ;)
As always I have a reason for doing things I really don't just pull this stuff out of my ass.
I ran my motor with both cranks identically prepped within 2 weeks of each other (one of my Pauters tapped the Oil Pump AUX shaft and chattered the #1 and #2 crank pins during an 8500rpm experiment)
The 7M is smoother across the board from idle to 6000 once above 6000 I couldn't feel a...
Tanya: Once I got to 500rwhp I started seeing really odd wear patterns on the Main bearings that I can only put down to crank flex/whip when turned fast for extended periods.
ie: Long pulls above 8000 rpm at high boost.
Not the normal situation for these engines and might apply to .05% of...
ANYTHING to do with a cooling system failure IS something to be very worried about with a 7M.......
Check the right angle hose on the hardpipe back there for starters.
I wouldn't drive it until it's sorted as you have the potential to do $$$'s of damage.
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