L92 max mill with 6.0 dished pistons
11-05-2018, 10:24 AM
#1
L92 max mill with 6.0 dished pistons Planning on finally trying L92 heads (823 stamping I think) and intake on my 2005 lq4 6.0 running a 226/231 .605/.598 113+4 cam.
I hear the L92 heads are 70 cc. With my factory dished pistons, would I have safe piston to valve clearance if using a 0.041" thick head gasket and milling the heads 0.020"?
I believe this cam has a 41.2° IVC spec.
I hear the L92 heads are 70 cc. With my factory dished pistons, would I have safe piston to valve clearance if using a 0.041" thick head gasket and milling the heads 0.020"?
I believe this cam has a 41.2° IVC spec.
11-05-2018, 03:26 PM
#2
ModSquad
iTrader: (6)
I’d vote yes, but it’s always wise to check ptv when you mock it up. Takes 20 minutes. And I’d look into a camshaft with a bigger split in duration for those heads. They like 10-12 degrees split. That’s a pretty popular setup these days.
11-06-2018, 07:07 PM
#3
Oddly enough it seems with square port heads and the ideal cam, even when the setup is down on the compression ratio, really good results occur. So after tracking down 823 heads, I'll just run an 0.040" thick 4.100" bore diameter headgasket. I'll get a 0.007" or so clean up mill along with exhaust port porting and that should do well.
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11-08-2018, 04:04 AM
#8
Ok so then a 0.015" mill would be pretty safe it sounds like combined with a 0.041" 4.100" bore diameter headgasket. So now to figure out how much to mill, either just a cleanup mill or up to and past 0.015"....
What is super odd is that there's a guy on YouTube that gained 60 rwhp swapping on unmilled 823 heads in place of the 64.45 cc 799 heads on his Lq4.
While others have gained well and others underperformed with even 0.020" milling on an 823/lq4 set up. I've read many times on here that milling reduces flow of the head, at what middle point is milling for CR more beneficial than flow?
What is super odd is that there's a guy on YouTube that gained 60 rwhp swapping on unmilled 823 heads in place of the 64.45 cc 799 heads on his Lq4.
While others have gained well and others underperformed with even 0.020" milling on an 823/lq4 set up. I've read many times on here that milling reduces flow of the head, at what middle point is milling for CR more beneficial than flow?
11-08-2018, 07:43 AM
#9
Ok so then a 0.015" mill would be pretty safe it sounds like combined with a 0.041" 4.100" bore diameter headgasket. So now to figure out how much to mill, either just a cleanup mill or up to and past 0.015"....
What is super odd is that there's a guy on YouTube that gained 60 rwhp swapping on unmilled 823 heads in place of the 64.45 cc 799 heads on his Lq4.
While others have gained well and others underperformed with even 0.020" milling on an 823/lq4 set up. I've read many times on here that milling reduces flow of the head, at what middle point is milling for CR more beneficial than flow?
What is super odd is that there's a guy on YouTube that gained 60 rwhp swapping on unmilled 823 heads in place of the 64.45 cc 799 heads on his Lq4.
While others have gained well and others underperformed with even 0.020" milling on an 823/lq4 set up. I've read many times on here that milling reduces flow of the head, at what middle point is milling for CR more beneficial than flow?
