Switching parts from a 305 to a 350 engine
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Junior Member
Joined: May 2001
Posts: 2
Likes: 0
From: Fort Worth, TX
Car: 1985 IROC-Z
Engine: 305 ci
Transmission: 700R4
Switching parts from a 305 to a 350 engine
Is it possible to switch off a TPI unit from an 305ci '85 Camaro IROC to a 350ci long block for the same car? If it is possible, do i need to modify the computer for the 350?
Thanks guys!
Thanks guys!
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
The quick answer is, yes, it's possible. Since you have the earlier bolt pattern intake manifold and 2-piece rear main seal, there is a greater supply of compatible 350s out there.
The computer will "work" with the 350, but you should get either an adjustable fuel pressure regulator to up the feed to your 19 lb injectors, or get 22 lb injectors (some would say do both). To get the most out of it, you need to fix the restrictive exhaust and plenum - the stock pieces restrict a 305. The more you modify it, the more a custom chip for the computer will be required to get the most out of it.
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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, LT MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1/95.5 @ 5800' Bandimere.
The computer will "work" with the 350, but you should get either an adjustable fuel pressure regulator to up the feed to your 19 lb injectors, or get 22 lb injectors (some would say do both). To get the most out of it, you need to fix the restrictive exhaust and plenum - the stock pieces restrict a 305. The more you modify it, the more a custom chip for the computer will be required to get the most out of it.
------------------
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, LT MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1/95.5 @ 5800' Bandimere.
Joined: Dec 2000
Posts: 2,341
Likes: 151
From: Cincinnati,Ohio
Car: 1991 BandittII Firebird
Engine: 5.7 HSR
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
yes you can do this but???
you will need an EPROM(computer chip)from a 350 TPI.the 5.7 has a more aggresive fuel curve.
the 19lbs injectors will work on a 350 but you'll see bigger gains from the 22lbs injectors
besides that the 5.0 and the 5.7 TPI intakes are the same.
now if i were you?while i had the intake off i would do some porting on the base,runner,and plenum
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1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://discussion-board.com/GreaterC...dyAssociation/
http://www.cincyspeed.com/
you will need an EPROM(computer chip)from a 350 TPI.the 5.7 has a more aggresive fuel curve.
the 19lbs injectors will work on a 350 but you'll see bigger gains from the 22lbs injectors
besides that the 5.0 and the 5.7 TPI intakes are the same.
now if i were you?while i had the intake off i would do some porting on the base,runner,and plenum
------------------
1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://discussion-board.com/GreaterC...dyAssociation/
http://www.cincyspeed.com/
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