Compression ???
Thread Starter
Teching In
Joined: Sep 2014
Posts: 35
Likes: 0
Compression ??? I am planning on doing some work on my G8. I am looking to bump compression up some looking ti mill the heads, any advice what would be best 0.030 or 0.040? And can you recommend me the proper head gasket?
L76 has 10.4 has 10.7. Those are both pretty good. Id mill no more than .020 and use a stock head gasket or .045 at thinnest. Every .006 is 1cc. Youlm run into ptv issues with a med cam more than that on a stock head gasket.
Felpro 1041 Hi the (your ?) G-8 was first made in 2008 though "down under" I am not sure that a 58x TW is fitted.
(Gray Sensor)
The UPGRADE from the 24xe TW to the 58x TW = .5 C.R. increase in the Knock Rating.
My HG choice is the Felpro 1041 which will help the Squish, good for Knock Rating.
Thus the HG -.010" AND the "mill" of -.020" = -.030" OK
YES do the DOD REMOVAL
The L/C of the Camshaft is VERY critical to PV, I would use a 116 C/L.
I can "model" PV with EAP AND I do not require a fee.
Lance
(Gray Sensor)
The UPGRADE from the 24xe TW to the 58x TW = .5 C.R. increase in the Knock Rating.
My HG choice is the Felpro 1041 which will help the Squish, good for Knock Rating.
Thus the HG -.010" AND the "mill" of -.020" = -.030" OK
YES do the DOD REMOVAL
The L/C of the Camshaft is VERY critical to PV, I would use a 116 C/L.
I can "model" PV with EAP AND I do not require a fee.
Lance
Using a thinner head gasket on an unknown piston to deck clearance isnt good, and milling the head and using a thinner gasket severely limits your cam options. Youve got a good enough cr as it is.
Get a mid range 227/235 cam and have some fun with it. Our dod delete kits are literally the least expensive of all the places and the most complete.
Shoot me an email if you want more info. and with your gearing id stay away from a narrow lsa, but going too wide will make you run the rpms up to make power.
Get a mid range 227/235 cam and have some fun with it. Our dod delete kits are literally the least expensive of all the places and the most complete.
Shoot me an email if you want more info. and with your gearing id stay away from a narrow lsa, but going too wide will make you run the rpms up to make power.
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Staging Lane
Joined: Aug 2014
Posts: 50
Likes: 0
From: Detroit, MI
I have a early 2009 G8. I milled my heads .024" and used a .040" cometic gasket. My CR is 11.45:1 Also, i liquid volumed my cylinder heads and they came out to be 64.3cc with Ferrea L92 hollow stem intake valves and stock exhaust valves. PTV clearance will vary depending on what cam you run.
On The Tree
Joined: May 2006
Posts: 131
Likes: 1
From: Virginia
With my 06 GTO with the LS3 heads, I had them milled .030" and used .040" gaskets. Running a CamMotion cam 230/238 .626" 113+3 and had to flycut .050". Compression cam to 11.27:1. Just had the car on the dyno last month, it pulled 480/434. Also I'm running a RCR modified intake.
