Hello All!
I recently upgrade the heads on my C6Z to get rid of the valve guide problem that plagues these cars on the OEM heads. I removed my OEM heads, sent them to American Heritage Performance in Cali. They cleaned them, put in new hardened powdered metal valve guides, new steel exhaust valves, new intake & exhaust valve springs. The heads were also ported and decked. Installed with new gaskets. I changed the oil after driving the car for 20 minutes, oil temp was about 160F which is normal operating temp for the car. The car brand new Airaid intake on it with an oiled filter. Oil filter was a ACDelco. Driving style is aggressive. I drive it pretty hard every time I get in it. Saw maybe 20 passes at a drag strip too. Below is the oil analysis of the oil change before putting it into storage. Refilled with Mobil 1 5w-30 EP and a Mobil 1 filter
Code:
Make/Model GM LS7 7.0L V8
Fuel Top Tier 93
Add. Corvette Z06
Oil used Mobil 1 5w-30 Universal Average
Miles on Oil 1,654 2,900
Miles on unit 49,486
Sample Date 11/23/2017
Aluminum 7 4
Chromium 2 1
Iron 39 32
Copper 2 5
Lead 3 7
Tin 1 1
Molybdenum 85 106
Nickel 1 1
Manganese 1 2
Silver 0 0
Titanium 11 2
Potassium 1 3
Boron 88 87
Silicon 6 10
Sodium 5 14
Calcium 941 1956
Magnesium 757 364
Phosphorus 705 790
Zinc 789 913
Barium 0 0
cST Visc @ 100C 10.71
Flashpoint 415F
Fuel
Antifreeze 0
Water 0
Insolubles 0.2
Code:
BlackStone Comments: Thanks for the notes. Depending on when you changed out the heads, valves, and springs & guides,
some of this may still be wear-in material. It usually takes at least a couple oil changes for most of that
material to wash out. Iron is high on a per-mile basis since averages are based on a longer oil change
interval of 2,900 miles. It shows wear at steel parts -- maybe the exhaust valves. Titanium is also up and
can come from connecting rods or intake valves. If this is related to wear-in, then there should be progress
next time. Use 1,500 miles again and check back.
I recently upgrade the heads on my C6Z to get rid of the valve guide problem that plagues these cars on the OEM heads. I removed my OEM heads, sent them to American Heritage Performance in Cali. They cleaned them, put in new hardened powdered metal valve guides, new steel exhaust valves, new intake & exhaust valve springs. The heads were also ported and decked. Installed with new gaskets. I changed the oil after driving the car for 20 minutes, oil temp was about 160F which is normal operating temp for the car. The car brand new Airaid intake on it with an oiled filter. Oil filter was a ACDelco. Driving style is aggressive. I drive it pretty hard every time I get in it. Saw maybe 20 passes at a drag strip too. Below is the oil analysis of the oil change before putting it into storage. Refilled with Mobil 1 5w-30 EP and a Mobil 1 filter
Code:
Make/Model GM LS7 7.0L V8
Fuel Top Tier 93
Add. Corvette Z06
Oil used Mobil 1 5w-30 Universal Average
Miles on Oil 1,654 2,900
Miles on unit 49,486
Sample Date 11/23/2017
Aluminum 7 4
Chromium 2 1
Iron 39 32
Copper 2 5
Lead 3 7
Tin 1 1
Molybdenum 85 106
Nickel 1 1
Manganese 1 2
Silver 0 0
Titanium 11 2
Potassium 1 3
Boron 88 87
Silicon 6 10
Sodium 5 14
Calcium 941 1956
Magnesium 757 364
Phosphorus 705 790
Zinc 789 913
Barium 0 0
cST Visc @ 100C 10.71
Flashpoint 415F
Fuel
Antifreeze 0
Water 0
Insolubles 0.2
Code:
BlackStone Comments: Thanks for the notes. Depending on when you changed out the heads, valves, and springs & guides,
some of this may still be wear-in material. It usually takes at least a couple oil changes for most of that
material to wash out. Iron is high on a per-mile basis since averages are based on a longer oil change
interval of 2,900 miles. It shows wear at steel parts -- maybe the exhaust valves. Titanium is also up and
can come from connecting rods or intake valves. If this is related to wear-in, then there should be progress
next time. Use 1,500 miles again and check back.
Last edited: