LB9 Replacement Heads?
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Junior Member
Joined: Feb 2008
Posts: 16
Likes: 1
From: Fort Myers, Fla
Car: 85 Iroc Z-28
Engine: 5.0 LB9
Transmission: monster transmission 700R4
Axle/Gears: Stock
LB9 Replacement Heads?
I have a 85 iroc with a LB9..stock except for thermostat, headers and exhaust. My valve seals are bad and i wanna replace my Heads. any suggestions? i need a good head that will work on a stock motor. would L89 alum heads work?
Also my fuel guage is not working, the needle goes way above full and never moves, any ideas on the problem?
Also my fuel guage is not working, the needle goes way above full and never moves, any ideas on the problem?
Joined: Jan 2005
Posts: 10,403
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: LB9 Replacement Heads?
Later ZZ4 heads will work better than the L98 Aluminum castings. They are actually both 113s, but the ZZ4 heads have a revised casting with cleaner ports and bowls, as well as back-cut intake/exhaust valves for increased flow. 355 HP/405 TQ from a 10:1 350 with a 208/221 @ .050" hydraulic roller cam.
Senior Member
Joined: Dec 1999
Posts: 770
Likes: 0
From: San Antonio, TX
Car: 86Z/92 RS Camaro
Engine: 357 vortec finished. need tuning
Transmission: Still works
Axle/Gears: need 3.73
Re: LB9 Replacement Heads?
Sending unit is bad or the fuel level meter on the in tank is stuck. You could try to bounce the rear end and hopefully cause the level meter to move. Same thing happens to my wifes Ford Explorer. Only happens when we top it off.
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