Topic: Can I do this??
in Forum: C3 Engines
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Former Member
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
I have never actually looked at a woodpecker's lips, but I agree that the first thing I thought when I read your first post was poor or incorrectly installed valve seals. And the wet/dry compression test is the way to tell. Warm up the engine, pull the coil wire and remove the spark plugs. Check and record every cylinder's compression. Then spray oil in each cylinder and check again. If the compression goes up significantly after the oil, the rings are leaking, so plan on a complete rebuild. If it stays about the same, just pull the heads and take them to a competent rebuilder.
And yes you can do this.
Larry
And yes you can do this.
Larry
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Larry, You the man for adding the instructions to do the wet/dry test.I always assume Vette drivers know how to take apart and put together Vettes,which is not the case.I have been doing it since I was 13 years old and a few years with Chevrolet Corvette Plant in St.Louis and still building engines today,54 yrs. later.....
Have a great day all....... Sal C
Lifetime MemberThanks guys, I really appreciate the info.
Another thing I was told is that the car might not have the correct oil in it that it needs in order to go through the break in period. To be honest, I don't know what it had in it, and I was just told this past week to try something like a 10w40 for the first 500 miles or so. Like I told Joel, I think the car only had about 150 miles put on it in the last five years since the rebuild, so it never went though a break in period. At this point is it too late for that?
Former Member
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
That is not true. While a proper break-in helps seal everything quickly, remember that new cars have a couple of miles on them when you get them, and you just drive them. There are oils that speed the wear in of the rings, they are not necessary. I use diesel oil for 500 miles to ease the cam beak-in, but that is probably over kill unless you have high valve spring pressures. I still lean toward poor quality or improperly installed valve seals.
Larry
Larry
in Forum: C3 Engines
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