lg4, 305 h.o., or vortech heads?
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Junior Member
Joined: Dec 2005
Posts: 28
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From: Viroqua, Wi. 30 miles south of LaCrosse
Car: 87' Firebird Formula
Engine: lg4 305
Transmission: 700r4
Axle/Gears: 3.73's finally
lg4, 305 h.o., or vortech heads?
I have a bone-*** stock 87 Formula with a lg4 w/ q-jet. The motor runs perfect with only 79,000 miles but I am wanting a little more power. I have a 4 bolt main 350 short block ready for heads and am wondering which head has the best bang for the buck. Should I use the original 305 heads and put in bigger valves, use the h.o. heads or buy a whole different intake and put the vortech heads on? Any advice is appreciated. Thanks, Bret
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Re: lg4, 305 h.o., or vortech heads?
What is the casting number of the heads you have now?
If they are the 081 heads you already have the equal to a "HO head" but with centerbolt valve covers. 87+
Takes more than just bigger valves to bring out the power. Needs a full port effort. The potential is there. You have to invest the effort.
Its a bit time consuming.
Vortecs are a great bolt on. Hard to go wrong there.
If they are the 081 heads you already have the equal to a "HO head" but with centerbolt valve covers. 87+
Takes more than just bigger valves to bring out the power. Needs a full port effort. The potential is there. You have to invest the effort.
Its a bit time consuming.
Vortecs are a great bolt on. Hard to go wrong there.
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