Intake & Carb Questions??
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Joined: Sep 2000
Posts: 110
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From: Duncan, OK USA
Car: 1987 Z28
Engine: LG-4 305
Transmission: 5-speed
Intake & Carb Questions??
I am thinking about changing the intake & carb on my 1987 Z28 LG4, as well as the air cleaner & distributer.
Any suggestions???????
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1987 Z28 Black & Silver 305 LG4/5-Speed . . .
NRA/AMA/FOP/IUPA/Blue Knights
Any suggestions???????
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1987 Z28 Black & Silver 305 LG4/5-Speed . . .
NRA/AMA/FOP/IUPA/Blue Knights
Joined: Mar 2000
Posts: 43,187
Likes: 45
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
A little more information is needed, like: What are you trying to achieve? What modifications have you done so far? Is there something in particular wrong with your current setup?
Assuming you just want a daily driver with better performance:
The single-snorkel air cleaner is restrictive on a stock LG4 - no matter what you do, do something about it. Either a dual-snorkel unit (especially if emissions is or ever will be an issue), or open element.
After that, the performance downers on the 305 are exhaust, cam, and heads, probably in that order. Take care of the exhaust (along with the air cleaner) before you spend money on anything else - headers, high-flow y-pipe, cat, & cat-back. A better grind cam is fairly easy to come by (although you should have a roller lifter cam in an '87, which will make a replacement more expensive, but at least the lifters should be okay for reuse). The heads are pretty poor - porting will help, but a set of pocket ported World Products 305 S/R Torquers are worth about 50 HP by themselves.
After that, you could consider an intake change, such as a Performer or Action+. But, carb & distributor changes will do next to nothing for you, unless your current pieces are FUBAR. For about the same or less money that a new carb and distributor would cost you, you could have your q-jet reworked by Jet that would give you all the performance you want and better economy than a similar-performing non-CC carb/distributor would ever give you.
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" Hedders, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere w/open diff & slipping tranny. Daily driver while Camaro was being put together.
Assuming you just want a daily driver with better performance:
The single-snorkel air cleaner is restrictive on a stock LG4 - no matter what you do, do something about it. Either a dual-snorkel unit (especially if emissions is or ever will be an issue), or open element.
After that, the performance downers on the 305 are exhaust, cam, and heads, probably in that order. Take care of the exhaust (along with the air cleaner) before you spend money on anything else - headers, high-flow y-pipe, cat, & cat-back. A better grind cam is fairly easy to come by (although you should have a roller lifter cam in an '87, which will make a replacement more expensive, but at least the lifters should be okay for reuse). The heads are pretty poor - porting will help, but a set of pocket ported World Products 305 S/R Torquers are worth about 50 HP by themselves.
After that, you could consider an intake change, such as a Performer or Action+. But, carb & distributor changes will do next to nothing for you, unless your current pieces are FUBAR. For about the same or less money that a new carb and distributor would cost you, you could have your q-jet reworked by Jet that would give you all the performance you want and better economy than a similar-performing non-CC carb/distributor would ever give you.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" Hedders, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere w/open diff & slipping tranny. Daily driver while Camaro was being put together.
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