5.0 or 5.7
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Joined: Feb 2013
Posts: 398
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From: Michigan
Car: 1986 Pontiac Trans Am
Engine: 5.0
Transmission: 700R4
5.0 or 5.7
I'm wondering what the block number behind the driver head should say if the engine is a 5.7? I was told the original owner swapped a 350 but looks like it says GM 5.0LG
Joined: Mar 2000
Posts: 43,187
Likes: 46
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: 5.0 or 5.7
Did you get the casting number from the other side of the engine?
I believe the last 3 digits of the casting number are also on the side of the block.
Not sure I've gotten reliable info on that 5.0/5.7 thing, but the casting number is a clear discriminator.
I believe the last 3 digits of the casting number are also on the side of the block.
Not sure I've gotten reliable info on that 5.0/5.7 thing, but the casting number is a clear discriminator.
Thread Starter
Member
Joined: Feb 2013
Posts: 398
Likes: 0
From: Michigan
Car: 1986 Pontiac Trans Am
Engine: 5.0
Transmission: 700R4
Re: 5.0 or 5.7
Is it in the same spot on the other side? I'll take a look tomorrow on the side
Joined: Mar 2000
Posts: 43,187
Likes: 46
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Senior Member
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Joined: May 2003
Posts: 539
Likes: 3
From: Huntsville, AL
Car: 87 GTA, 88 GTA, 92 TA, 72 RS SS
Engine: 350, 350, 305, 396
Transmission: T56, 700r4, 700r4, T56
Axle/Gears: 3.42, 3.23, 3.23, 3.73
Re: 5.0 or 5.7
Says 5.0LG in the first picture, 5.7 would be stamped 5.7LG
Last edited by battman; May 22, 2017 at 03:23 PM.
