Recommended octane for a LB9 TPI 5.0 engine?
Junior Member
Joined: Jan 2006
Posts: 23
Likes: 0
From: MI
Car: '85 El Camino SS
Engine: 305
Transmission: Turbo2
Axle/Gears: 3.42
Sure it can but I would recommend midgrade. Compression is only 9.3 so it should run ok. I always run premium but recent prices have me wondering if its worth it.
Senior Member
iTrader: (2)
Joined: Nov 2005
Posts: 600
Likes: 1
From: Old Bridge, NJ
Car: 1992 Camaro RS
Engine: 383 SuperRam
Transmission: 4L60
Axle/Gears: 3:23 Posi
I belive the owners manual recomends 92 octane for TPI 305 and 350. I ran regular in mine and all I got was spark not and pigging. Id stay with atleast mid grade.
Member
Joined: Jan 2006
Posts: 110
Likes: 0
From: Oceanside NY
Car: 1989 Firebird Formula
Engine: LB9 305 tpi
Transmission: Auto
Axle/Gears: open 2.73's baby!!
i have a lb9 and i run 87 in it and i beat the hell out of it with no pinging at all, keep it at stock timing and ull be fine. good luck!
Supreme Member
iTrader: (1)
Joined: Feb 2000
Posts: 7,964
Likes: 4
From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
I am running 87 in mine and it's been working great. No spark knock or any issues. I am running 12* inititial timing as well. I thought I'd have to back the timing off, but apparently I didn't have to.
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