305 ignition and 400 block
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Joined: Feb 2001
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From: chicago,Illinois
305 ignition and 400 block
Hello All,
I have a 305sbc 4brl with factory eletric carb and distributer. I want to put a 400sbc with a edlebrock manifold and 400 heads in its place. Is it possible to do and keep the carb and will there be a big difference in performance? Also will i have to get the carb rejetted(+MSD help) and what other mods might i have to do?
I have a 305sbc 4brl with factory eletric carb and distributer. I want to put a 400sbc with a edlebrock manifold and 400 heads in its place. Is it possible to do and keep the carb and will there be a big difference in performance? Also will i have to get the carb rejetted(+MSD help) and what other mods might i have to do?
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
See the magazine articles by Steve Green ("Stroke in the Desert", or something like that). He did this on a 383, which is close enough to your 400.
You should figure on upgrading the air cleaner and exhaust to freer flowing pieces.
And, dump the factory 400 heads - they're absolute junk for performance. Go with some type of performance replacement heads like World Products, Edelbrock, Holley, AFR; anything but stock 400 heads.
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 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 & 3" cat-back).
57 Bel Air, my 1st car. 0.030 over 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlock header mufflers, 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 15.1/94.6 @ 5800' Bandimere.
You should figure on upgrading the air cleaner and exhaust to freer flowing pieces.
And, dump the factory 400 heads - they're absolute junk for performance. Go with some type of performance replacement heads like World Products, Edelbrock, Holley, AFR; anything but stock 400 heads.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 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 & 3" cat-back).
57 Bel Air, my 1st car. 0.030 over 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlock header mufflers, 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 15.1/94.6 @ 5800' Bandimere.
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