I have a 305 already and I would love to do it up instead of a 350. Just how much lost in making power would there be and could I get any real power out of a 305?

 

The best I have ever seen a 305 able to do is hang even with LT1 fourth-gens. I know a guy with a 91 Z28 305TPI 5-speed with almost every mod imaginable. SFC's, ported and polished heads, intake, and runners, k&n filter, underdrive pulleys, 3.55 gears, lakewood LCA's and panhard rod, everything. And he can hang dead even with an LT1 4th gen. I think I would rather have a 350...

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1983 Firebird
TH700R4 Auto
Small Block 400
LG4 ECM, Intake, Carb, Distributor, etc.
Soon to be non-computer.
Clarion Head Unit 45X4
2 Pioneer 400W 12" Subs
Third Gen Performance
"A four cylinder is half an engine."
"Ponies can run, but birds can fly..."

 

350 is the way to go. you can get so much more horsepower out of a 350 than a 305. Hell, why not just get a 502

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei distributer
'95 3.23 rearend
hotchkis rear suspension
PST front polygraphite suspension
"speed kills. buy a f@&d, live forever."

 

Unless your going to get a supercharger or turbo for the 305, I would go with a 350. There is a guy on these boards I believe running low 13s with a 305. But definately go with a 350.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

I was just thinking 305 to keep everything original that is all...

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92 z-28 G92 black with white racing stripes.
Dynomax cat back
Hypertech chip
5 speed

 

How "original" do you mean?

If externally visually original, you're very limited - cam, porting heads & intake.

If you're willing to go beyond that, like replace the heads & exhaust, then take a look at my sig for the work-in-progress. You might want a different cam (like a computer-compatible type), but you'll be getting good power. Being able to hang with LT1 4th-gens is nothing to sneeze at.

It still would have less power than a 350, though. A 350 could even look original externally.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR 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 @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

[This message has been edited by five7kid (edited September 18, 2001).]

 

all small blocks look the same on the outside. it's the bore size and stroke that are different.a 350 will look just the same externally as a 305.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei distributer
'95 3.23 rearend
hotchkis rear suspension
PST front polygraphite suspension
"speed kills. buy a f@&d, live forever."

 

how bout ******* supercharged 305...? now thats a 305 for ya

 

TPI 305, ya a 350 would do better hands down, but carbed up 305, well. I know of one person (1 is good enough for me) that runs 550 horse out of a 305 (granted he runs 4 down draft webbers), but you can still get 300hp out of a 305 and it most cases if done right 350 which is enough to take an LT1 no problem (as most of the 3rd gens are lighter).


But any and I mean ANY 350 that has even a few mods to crack it over the 300hp hump will smoke a 305.

But all said and done, my next car will be a 305 and 5 speed or go back to good old days of Z28 and 302!!!

My .02

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1989 Trans Am GTA, L98 5.7L TPI, TH700-R4, T-Tops, dual cats, 9-bolt rear, 3.27, Dynomax muffler, K&N
1992 Camaro RS, LO3 5.0L TBI, T-5, T-Tops, 3.08, L69 Dual Snorkel, K&N - Sold

Honda engines ROCK, I have one on my lawn mower but I still have to push it.