LT1 Galley Plugs
Thread Starter
Instructor
Joined: Dec 2000
Posts: 206
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From: Mt Juliet TN
LT1 Galley Plugs
I had one of the galley plugs (the three plugs behind the cam sprocket) blow out and oil starve one of my heads. Consequently I had three exhaust valves seize and one spring break.
I have the engine apart and I am going to tap the galley and put screw in plugs. The center galley line seems like it will work with a 1/4"NPT tap, but the two outside ones have larger holes that go ½" to ¾" inside then they are the same size as the center galley. It looks like it can be tapped with the 1/4" NPT but it is close to the lifter bore.
I looked at Jegs and Summit and have not seen a tapped galley plug kit.
On the outer lines can I just tap the holes deep or should I find a tap that fits the outer hole?
Will a 3/8" NPT work?
I have the engine apart and I am going to tap the galley and put screw in plugs. The center galley line seems like it will work with a 1/4"NPT tap, but the two outside ones have larger holes that go ½" to ¾" inside then they are the same size as the center galley. It looks like it can be tapped with the 1/4" NPT but it is close to the lifter bore.
I looked at Jegs and Summit and have not seen a tapped galley plug kit.
On the outer lines can I just tap the holes deep or should I find a tap that fits the outer hole?
Will a 3/8" NPT work?
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: LT1 Galley Plugs (Corvette55)
3/8"NPT will work. Don't tap too deep, ig you do you can screw in the plug too deep and restrict the oil passage.
Why not use just regular plugs and secure them in place w/ a chisel mark?
Marck
Why not use just regular plugs and secure them in place w/ a chisel mark?
Marck
Thread Starter
Instructor
Joined: Dec 2000
Posts: 206
Likes: 0
From: Mt Juliet TN
Re: LT1 Galley Plugs (Twin_Turbo)
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Why not use just regular plugs and secure them in place w/ a chisel mark?
Marck
The plugs were replaced by the machine shop during my first rebuild. One of the pressed in and chiseled plugs blew out. I run autocross and track events with this car and it sees allot of high RPM. I am running a high-pressure high-volume pump. I just want to make sure the same failure does not happen again
Why not use just regular plugs and secure them in place w/ a chisel mark?
Marck
