Thread: Convert 305 to 350

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I have a 1990 Trans Am GTA with a 305 that I am planning to rebuild eventually. I know I want a 350. I'm trying to decide on the following 2 options:

- Convert original 305 to 350
- Buy a new 350

what would someone with experience recommend?

I am also planning on turbo charging my small block. I'm aiming for about 450HP on the dyno.

- Jeff P.B

You're going to have to get a 350, you can't bore a 305 that far.

If I want to make my car VERY similar to a Z06 corvette, what 350 would you recommend? I intend to use a turbo and intercooler. My car is about 1000 lbs heavier than a corvette.

(sorry, this doesnt really fit the subject)

-Jeff P.B

Look at Crate engines. You can pick up some pretty exotic ones at far less than it would cost to build yourself Here is a link for ya www.crateenginedepot.com Later DH

thanks for the info.

Can I use TPI on the ZZ4 engine? My car currently has a nice TPI system that I'd like to carry over (although it's suited to a 305), and i'm not sure if it will fit to the intake manifold of the ZZ4. Would I likely have to replace the intake manifold?

Jeff

u can use the tpi on the zz4, but u have to get bigger injectors. maybe get the holley manifold(Stealth Ram).

Originally posted by JPB
If I want to make my car VERY similar to a Z06 corvette, what 350 would you recommend?

These are Z06 specs:

ENGINE
Type: V-8, aluminum block and heads
Bore x stroke: 4.13 x 4.00 in, 104.8 x 101.6mm
Displacement: 428 cu in, 7008cc
Compression ratio: 11.0:1
Fuel-delivery system: port injection
Valve gear: pushrods, 2 valves per cylinder, hydraulic lifters
Power (SAE net): 505 bhp @ 6300 rpm
Torque (SAE net): 470 lb-ft @ 4800 rpm
Redline: 7000 rpm




DRIVETRAIN
Transmission: 6-speed manual
Final-drive ratio: 3.42:1, limited slip
Gear - Ratio - Mph/1000 rpm - Speed in gears
I - 2.66 - 8.4 - 59 mph (7000 rpm)
II - 1.78 - 12.6 - 88 mph (7000 rpm)
III - 1.30 - 17.3 - 121 mph (7000 rpm)
IV - 1.00 - 22.4 - 157 mph (7000 rpm)
V - 0.74 - 30.3 - 198 mph (6500 rpm)
VI - 0.50 - 44.9 - 160 mph (3600 rpm)

Curb weight: 3147 lb
Weight distribution, F/R: 50.9/49.1%
Curb weight per horsepower: 6.2 lb

HANDLING
Roadholding, 300-ft-dia skidpad: 0.98 g


FUEL ECONOMY
EPA city driving: 16 mpg
EPA highway driving: 26 mpg


Good luck!!!!

500 HP and 26 MPG? HELL YES!!!!