081 heads on LG4??
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Joined: Mar 2002
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From: Sharon, CT
Car: 87 Firebird Formula
Engine: 355
Transmission: T5
081 heads on LG4??
Well we pulled out the lg4 today and went to swap the heads onto my new motor and the casting numbers are 081 and not 416. 081 castings were for TBI right? I'm almost 100% positive that the previous owner didn't swap the heads. He barely even knew how to change the oil. But anyway, why would my car have these are they are really gonna restrict this 350 till I get my vortecs aren't they?
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From: northeast ohio
Car: 2000 astro
Engine: 4.3
Transmission: A4
Axle/Gears: 7.5 with 3.42 gears
nope, they're not tbi heads.
081 castings are for lg4's starting in 1987. dunno what other engines they used them on.
081 castings are for lg4's starting in 1987. dunno what other engines they used them on.
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Joined: Jul 1999
Posts: 18,457
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Right, 081s were used starting in 87 on LG4, LB9, and L69 (Monte Carlo).
Their flow and port design and all that is very similar to the 416. They use center bolt valve covers and have the later model intake bolt angle, that's about all that's different.
Their flow and port design and all that is very similar to the 416. They use center bolt valve covers and have the later model intake bolt angle, that's about all that's different.
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