If I have a 350 shortblock what else do I need to swap out my 305?
Thread Starter
Member
Joined: Nov 2000
Posts: 142
Likes: 0
From: WV
Car: 1991 RS and 1998 Trans Am
Engine: 6.0L(lq4) & 5.7L(ls1)
Transmission: 4L60e
Axle/Gears: 323
If I have a 350 shortblock what else do I need to swap out my 305?
Well the old Lo3 has almost 170,000 on it and it's time for a new engine. I want to do this by saving as much as possible since I plan on getting another car this summer. If I have a complete 350 shortblock what can be used from the 305 and what else will i have to buy new? I know i'll need chip and injectors, but what i'm really concerned with is the engine and ignition parts. BTW the 350 shortblock is for 87 and newer cars also. Thanks for the help.
------------------
91 metallic blue RS Flowmaster exhaust, Eibach Sportline Springs, KYB shocks, Open element, 323 posi rear w/ rear discs. TPI conversion soon.
------------------
91 metallic blue RS Flowmaster exhaust, Eibach Sportline Springs, KYB shocks, Open element, 323 posi rear w/ rear discs. TPI conversion soon.
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
Swap everything from the 305 to the 350 except the harmonic damper (use a 350 piece). You should probably get heads made for a 350, though, as the 305 chambers are 58cc and 350's 64cc. The 305 heads on a 350 will increase compression more than you'd want for a street driver. Good time to upgrade to something like World Products S/R Torquers (get the '87-up style).
Some say get a 350 knock sensor and module, others say don't bother. Your chip will probably be okay if the cam isn't too wild in the 350.
An adjustable fuel pressure regulator will probably be all you need until your mods get more advanced.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, 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 @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
Some say get a 350 knock sensor and module, others say don't bother. Your chip will probably be okay if the cam isn't too wild in the 350.
An adjustable fuel pressure regulator will probably be all you need until your mods get more advanced.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, 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 @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
Thread
Thread Starter
Forum
Replies
Last Post
theshackle
Tech / General Engine
4
Mar 5, 2017 06:37 PM
Sanjay
Engine/Drivetrain/Suspension Parts for Sale
1
Aug 12, 2015 03:41 PM
