Milling 113 heads
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Joined: Nov 2003
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From: Overland Park Kansas
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One member I know in this forum had his done that amount. 1 yr later, he lost a head gasket. But, that was attributed to the multiple 1010 Felpro gasket failures (which he was using). Personally, I don't believe it was the milling.
FYI: There are companies that will mill that much off new heads to get smaller chamber sizes -- and I'm talking smaller than 56cc (like 53, 54, 55cc...). Check with other cylinder head shops. See if you can find one that says .030" is a problem.
Worst problem I can see is it brings your front & rear china walls about that much closer to the block. You might need to skip using those gaskets and go with 100% silicone.
FYI: There are companies that will mill that much off new heads to get smaller chamber sizes -- and I'm talking smaller than 56cc (like 53, 54, 55cc...). Check with other cylinder head shops. See if you can find one that says .030" is a problem.
Worst problem I can see is it brings your front & rear china walls about that much closer to the block. You might need to skip using those gaskets and go with 100% silicone.
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One member I know in this forum had his done that amount. 1 yr later, he lost a head gasket. But, that was attributed to the multiple 1010 Felpro gasket failures (which he was using). Personally, I don't believe it was the milling.
FYI: There are companies that will mill that much off new heads to get smaller chamber sizes -- and I'm talking smaller than 56cc (like 53, 54, 55cc...). Check with other cylinder head shops. See if you can find one that says .030" is a problem.
Worst problem I can see is it brings your front & rear china walls about that much closer to the block. You might need to skip using those gaskets and go with 100% silicone.
FYI: There are companies that will mill that much off new heads to get smaller chamber sizes -- and I'm talking smaller than 56cc (like 53, 54, 55cc...). Check with other cylinder head shops. See if you can find one that says .030" is a problem.
Worst problem I can see is it brings your front & rear china walls about that much closer to the block. You might need to skip using those gaskets and go with 100% silicone.
I had already planned on going to a thicker head gasket so the a future head swap would be slightly easier, realizing that I would have to mill on something like a 64cc chamber quite a bit to keep compression similar to what I am going to have with the milled 113's
Head gasket failures is something I had heard rumors about from taking a head down too far. I just thought I'd double check with all the members here which seem to have a ton of 113 specific experience
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
I had already planned on going to a thicker head gasket so the a future head swap would be slightly easier, realizing that I would have to mill on something like a 64cc chamber quite a bit to keep compression similar to what I am going to have with the milled 113's
Head gasket failures is something I had heard rumors about from taking a head down too far. I just thought I'd double check with all the members here which seem to have a ton of 113 specific experience
Head gasket failures is something I had heard rumors about from taking a head down too far. I just thought I'd double check with all the members here which seem to have a ton of 113 specific experience
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Safety Car
Joined: Oct 2008
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From: Yucaipa CA
Nope just saying I don't think 30 is doable and if you could by cutting to much wouldn't you alter the angle of the intake port area and its ability to seal. I think these were cut to 20 thousandth's I'm not sure been awhile since I had them done. You can see how close it is now to the valve.
