Help With L69
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Junior Member
Joined: Aug 2001
Posts: 19
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From: Rothschild, WI, USA
Help With L69
I have an 84 Z-28 with the L69 305HO. What I'm wondering is what can I do to this car to get more HP? Is it reasonable to think I can get at least 275hp? Or should I just spend the money on a 350 and build that instead? Next is the T700-R4 hefty enough to handle 275 to 300 hp? Is the 84 Z-28 hefty enough to handle it? I heard thaat the Third gen where only sturdy enough to handle a little over 250HP... Back to the motor question.. What do I do with all the emissions crap that wont have a hole to go in if I change say the intake (or carb or headers)to an aftermarket model?? I think I can answer just about all my questions but I'm not completly sure about this since I fix airplanes not cars.... so all the help I get would be much appreciated.. Thank you
Joined: Mar 2000
Posts: 43,187
Likes: 42
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
Headers w/high-flow cat & cat back, cam, heads, intake; in that order. 275 flywheel HP easy. Do it all at once if you like. The combo I'm putting together in my sig desktops at over 320, but I wouldn't be surprised if that's a little optimistic. Your block wouldn't take a roller cam without retrofit roller lifters, though.
The engine bottom-end can handle it if it's in decent shape. The tranny should have a Transgo shift kit (not B&M) put in, or a later tranny built up - the Transmission forum can provide more details there. Subframe connectors and poly suspension bushings are always a good idea.
All of the upgrade parts are available emissions-compatible.
Go ahead and use the avgas, but stay away from that crappy piston engine oil the FAA makes you use and change all the time.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
The engine bottom-end can handle it if it's in decent shape. The tranny should have a Transgo shift kit (not B&M) put in, or a later tranny built up - the Transmission forum can provide more details there. Subframe connectors and poly suspension bushings are always a good idea.
All of the upgrade parts are available emissions-compatible.
Go ahead and use the avgas, but stay away from that crappy piston engine oil the FAA makes you use and change all the time.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
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