EagleTalonTim
15+ Year Contributor
- 833
- 13
- Jan 10, 2007
-
Brighton,
Tennessee
Good evening all! I am in the middle of a build and am checking what the last machine shop did on the head of my car and found something interesting... The milled surface is not even and I think it is out of the service range Here are the readings I got :
Transmission side (#4 piston side) : 131.69 mm
Timing belt side (#1 piston side) : 131.63 mm
About 2 years ago, I had the head and block milled for MLS use. After it was milled, the MLS sealed just fine. I drove it for about a year until I pulled the head back off to do what I should have done before milling the head....the oil port mod.... Since the MLS was pretty much missing all the Viton coating, I decided to go back to a Felpro composite head gasket and did not mill the surface again. Another year and I am now back in the same boat and needing to make the decision of milling the head for MLS once again, or throw an MLS on it and hope for the best? The machine shop I just took my head to scratched the surface with something when pulling the valves out for me. The scratches are not that bad, but are noticeable and go between one cylinder and the water port right next to that cylinder. I can take pictures if needed.
Having said all that... What should I do? Mill the head again? Find a thicker MLS? Anything else? I want to eventually run over 30 psi once I get my tune right and have heard that composite gaskets don't do well over 30 psi. Also, since the head has been milled several times and the block has been milled, I am worried I will now need adjustable cam gears to get the cams dialed in again. Any help is appreciated!
Transmission side (#4 piston side) : 131.69 mm
Timing belt side (#1 piston side) : 131.63 mm
About 2 years ago, I had the head and block milled for MLS use. After it was milled, the MLS sealed just fine. I drove it for about a year until I pulled the head back off to do what I should have done before milling the head....the oil port mod.... Since the MLS was pretty much missing all the Viton coating, I decided to go back to a Felpro composite head gasket and did not mill the surface again. Another year and I am now back in the same boat and needing to make the decision of milling the head for MLS once again, or throw an MLS on it and hope for the best? The machine shop I just took my head to scratched the surface with something when pulling the valves out for me. The scratches are not that bad, but are noticeable and go between one cylinder and the water port right next to that cylinder. I can take pictures if needed.
Having said all that... What should I do? Mill the head again? Find a thicker MLS? Anything else? I want to eventually run over 30 psi once I get my tune right and have heard that composite gaskets don't do well over 30 psi. Also, since the head has been milled several times and the block has been milled, I am worried I will now need adjustable cam gears to get the cams dialed in again. Any help is appreciated!