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Empty hole on rear lifter valley rail?

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Old Aug 10, 2004 | 12:27 PM
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Egg83
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From: Bucks County Pa
Car: 85 Firebird
Engine: 355 Vortec TPI
Transmission: 700r4 with Pro-Built goodies
Axle/Gears: LS1 3.42 Posi Disc
Empty hole on rear lifter valley rail?
Hey guys, i am assembling my 355 and i noticed a threaded hole that is about 3/8'' in diameter. This hole is empty with no plug in it. What is this hole for? I am assuming that it is part of the oil system. Shold it be plugged? Thanks, Bob
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Old Aug 10, 2004 | 12:33 PM
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RB83L69
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Where is it?
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Old Aug 10, 2004 | 12:43 PM
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Egg83
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From: Bucks County Pa
Car: 85 Firebird
Engine: 355 Vortec TPI
Transmission: 700r4 with Pro-Built goodies
Axle/Gears: LS1 3.42 Posi Disc
The threaded hole is on the firewall facing rail of the lifter valley. up on top of the rail, it is oriented horizontally with the ground when installed in the car.
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Old Aug 10, 2004 | 12:54 PM
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RB83L69
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From: Loveland, OH, US
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Would this be at the very top of the block, where the intake goes, about halfway between the head decks?
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Old Aug 10, 2004 | 12:58 PM
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Egg83
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From: Bucks County Pa
Car: 85 Firebird
Engine: 355 Vortec TPI
Transmission: 700r4 with Pro-Built goodies
Axle/Gears: LS1 3.42 Posi Disc
Yes, that is exactly where it is located, thanks for all of the help RB.
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Old Aug 10, 2004 | 01:04 PM
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RB83L69
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From: Loveland, OH, US
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Transmission: 5
Oil pressure sending unit, for either the gauge or fuel pump
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Old Aug 10, 2004 | 02:39 PM
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Egg83
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From: Bucks County Pa
Car: 85 Firebird
Engine: 355 Vortec TPI
Transmission: 700r4 with Pro-Built goodies
Axle/Gears: LS1 3.42 Posi Disc
Unless i am mistaken doesnt the intake manifold cover this up once installed?
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Old Aug 10, 2004 | 02:56 PM
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RB83L69
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From: Loveland, OH, US
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No, it does not; it has a notch that goes around it. Otherwise it would have been very difficult for the factory to put the oil pressure sender there.
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