My dad said that with our tax return he will help me really soup up my 305/rebuild with high performance parts.I do not want a 350,but was curious if anyone here has ever souped one of these up real good..what parts do I need??How much will it cost for everything..we know a guy who will do it real cheap..he did the enigine in my dads 63 nova ss for $800..what kind of power can I expect from all this??????

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86 IROC,canary yellow(originally black),fully loaded.305TPI WITH 700R4/SHIFT KIT,2:73 POSI REAR,4 WHEEL DISC BRAKES,T-TOPS,POWER LOCKS,POWER WINDOWS,TILT,CRUISE,SADDLE INTERIOR,POWER ANTENNAE,SPOILER OFF 87 IROC SO NO THIRD BRAKE LIGHT ON ROOF,16" BY 8" RIMS OFF 89 IROC,3"INCH EXHAUST WITH A 2 CHAMBER FLOWMASTER AND 3 1/2" BY 18" LONG CHROME TIPS,20% TINT ON SIDES,HATCH AND T-TOPS,GTS TAILLIGHT COVERS,AFTERMARKET FOG LIGHTS,PIONEER CD RECIEVER WITH REMOTE AND DETACHABLE FACEPLATE,WITH JENSON SPEAKERS ALL AROUND,TALKING RADAR DETECTOR"BACON ALERT"

....Long live the EIGHTIES!!!

 

I'm not sure making a 5.0 pull like a 400hp 350 is feasible, but I know you can have some fun with 'em. The mods i have in my signature have gotten me a best of 14.83 and it pulls hard until 70 mph. I went road racing last night at New Carrolton Metro( i see your from MD, you should come up there) and beat the snot out of a '78 Firebird Formula 400 off the line, but he eventually caught up...mainly due to my restrictive manifolds not letting my engine breathe at the higher RPM's. But anyways, a good pair of heads (world products or edelbrock),a Hi-Flow base and runners, ported plenum, and a mild cam should be more than enough. But I've seen people running mid-low 13's on the stock 'peanut' cam in our 305's. And if those mods still arent enough 'pull' for ya, call Vortech

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1988 Pontiac GTA 5.0 TPI
-K&N Filter
-Hypertech Air Foil
-Hypertech Perf. Chip
-2.5in Flowmaster Muffler

Kills
94 Probe GT, 95 Mustang GT, 86 Trans Am 305 TPI, 96 Impala SS, 85 Thunderbird 5.0, 95 Thunderbird 4.6, 95 Accord V6, 80 Mustang Cobra, 98 Integra VTEC

[This message has been edited by 5.0GTA (edited February 04, 2001).]

 

Mike,

Search the archives for "305", "power", and whatever other search criteria you feel is appropriate. You'll probably find lots of references. It takes a lot of work and hardware to get more than 320HP from a daily driver 305 on pump gas.

One thing you might want to consider - since the engine will have to be removed anyway to accomplish the kind of work you will need, and you'll need an engine stand to perform most of the assembly, you might want to get a stand ahead of time. For a couple hundred bucks you can get a used/running V-8, either 305 or 350 (some people actually give away used 305s). Spend your time and cash acquiring the knowledge, techniques, parts, and supplies you need to build what you want. Since you will be able to use your car while all of this is going on, you'll be able to take your time and get it right the first time. When it's done and ready, remove the orignial engine and install the "spare". It's up to you to decide whether you want a 305, 350, 383, 400, 420, etc. The blocks are all the same from the outside, so it doesn't matter. One thing to consider is that there are a lot more possibilities for performance parts if you use a 350 or larger displacement, and the horsepower comes easier with the larger bore. You can make a 305 generate 300-350 HP if you want, but it will take more work and cash. By comparison, I have a 355 that used off-the-shelf parts and very little custom work. With headers and a decent intake, firly streetable cam profile, and 11:1 TRW flat-tops, and STOCK heads with a little modification it makes 423HP on the dyno.

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Later,
Vader
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"Make Me Bad..."
Adobe Acrobat Reader 4.0

 

400 HP out of a 305 would be quite a task. If you're wanting to run N/A and get that kind of power, I would suggest starting with no less than 350 c.i., as I don't think a N/A EFI 305 will yield that kind of power. So, basically you have three options... 1) Beef up your lower end, and throw a Vortech or ATI supercharger at it 2) Buy an L98 and treat it to a good set of aftermarket heads, camshaft, LT headers, and an improved intake system ( mini-ram or LTR setup ) 3) beef up the lower end of your 305, raise compression to around 11-1, and throw about a 150 shot at it. Those 3 scenarios should get you where you want to be. Good Luck.

 

Supercharger or Nitrous.

Nitro Don

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1990 Trans Am WS6
305TPI 700R4

ENGINE:
150hp NOS kit
March underdrive pulleys
Edelbrock headers(JetHot)
Mac off-road pipe
Flowmaster exaust
Jacobs ultra coil
K&N filter
Fulley ported base,
runners,& plenum
Crane AFPR
Hypertech airfoil
Crane 1.6 rockers
210/220 .533/.544 Cam
W/P Torquer heads
Edelbrock TPI Base
Edelbrock TI Runners
Edelbrock 52mm T.B.
TRANSMISSION:
Richmond 3.73's
Auburn posi
B&M Mega shifter
TCI shift kit
Vette servo
B&M 3-4 upshift kit
TCI Trans Rebuild
2800 stall 9.5" TC
Nitto Drag radials
FUTURE MODS:

BEST RUN:
12.48 @ 109.23 MPH
(with stock heads,cam,intake,and crappy Pep Boy's tires)