LT1 rebuild
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Junior Member
Joined: Apr 2013
Posts: 63
Likes: 0
From: Las Vegas, NV
Car: 1989 Pontiac Firebird
Engine: 5.7l LT1
Transmission: T56
LT1 rebuild
So I bought a non running 95 Formula Firebird hoping to use the engine in my 89 and surprisingly it needs a rebuild. Since I'm going to have it out I think i'm going to bore .030 over and stroke to 383. Because I've never done anything but stock rebuilds I need some help choosing what parts to buy. This car is driven as one of my primary vehicles so whatever build I go with needs to be streetable. Thanks for the help guys!
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
It doesn't run and you're surprised it needs a rebuild?
What exactly about it needs rebuilding?
For a primary transportation vehicle, I'm not sure I'd go to the expense of a stroker crank. If it needs to be overbored (and I'd need to be convinced of that), hypereutectic pistons would be fine. Stock rods with upgraded rod bolts will take a lot of punishment. A cam, good exhaust, and tune make these engines run great.
What exactly about it needs rebuilding?
For a primary transportation vehicle, I'm not sure I'd go to the expense of a stroker crank. If it needs to be overbored (and I'd need to be convinced of that), hypereutectic pistons would be fine. Stock rods with upgraded rod bolts will take a lot of punishment. A cam, good exhaust, and tune make these engines run great.
Thread Starter
Junior Member
Joined: Apr 2013
Posts: 63
Likes: 0
From: Las Vegas, NV
Car: 1989 Pontiac Firebird
Engine: 5.7l LT1
Transmission: T56
Re: LT1 rebuild
It's one of my primary vehicles, and the stroker crank isn't actually that much more than a good crank anyways. The only reason I was thinking of overboring is because I pro
bably need to machine it anyways and figured I may as well have it bored while i'm at it.
bably need to machine it anyways and figured I may as well have it bored while i'm at it.
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