Can't remember exactly which magazine this was in, but I saved the info:

This is a pretty good comparison to fuel the constant 305 vs 350 debate.

LG4 305 Gross Dyno numbers
Headers, Flowmasters, non computer Q-Jet , HEI

Baseline ----------------197HP @ 4600 ------- 261TQ @ 3100
+Performer Intake---- 217HP @ 4200 ------- 285TQ @ 3300
RPM Intake ------------ 231HP @ 4800 ------- 285TQ @ 3300
Victor Jr / 750 Hol ---- 228HP @ 4700 ------- 291TQ @ 3500

+X-treme 218/224 ---- 270HP @ 5100 ------- 291TQ @ 3700
__ (vacuum 20” to 14.5” – however very little low end loss )

+Vortec heads and
Super Victor intake --- 325HP @ 5800 -------- 317TQ @ 4800

+AFR 1.99/1.55 58cc
Uncapped exhaust
Perf RPM, mod 650 – 387HP @ 6000 -------- 368TQ @ 4000

- - - - - - - - - - - - - - - - - - - - - - -

Goodwrench 350 - Gross Dyno numbers
L98 manifolds, Flowmasters, Q-Jet, LG4 intake, stock cam

Baseline ----------------- 230HP @ 4500 ------- 320TQ @ 3000
+Performer&headers - 258HP @ 4500 ------- 331TQ @ 3100

+218/228 – 112 cam – 309HP @ 5500 ------- 354TQ @ 3750

+Vortecs, Performer
+X-treme 224/230 ----- 376HP @ 5700 ------- 395TQ @ 4300

+SuperVic750 Demon- 395HP @ 5700 ------- 398TQ @ 4300

The 305 will wake up with the 'usual' sbc mods, people just give up on it, because the 350 is so similar and slightly cheaper bottom-end wise. Just because you haven't seen a good runnin 305 doesn't mean there aren't any. Everybody doesn't post on the internet, and the 3rd gen has been out many years before people started talking on message boards. The same mods that work on a 350 will work on a 305.

 

onefastgta - Wow, those are some pretty impressive numbers! I found a guy down the road from me selling his 85 Z28 with a carbed 305 in it. I may just go ask him how much! My 81 T/A probably won't be done for a long while due to the fact I'll have to do a lot of fabrication on it, it would be nice to have another F-Body with some good power for a daily driver again! Thanks for the info!

 

Awesome post man In fact, I am saving that post for people in the future that diss the 305 and dont believe in it

 

Better, yet, why don't people just get it through their heads that not EVERY CAR LOVING PERSON in the world doesn't have a hardon for 350's. If I wanted a 350 car, I woulda searched around for one, but it wasn't a big deal to me weather I found a 305 TPI or a 350TPI. Just don't understand what the big deal is about a 350. That post proves what I tell people all the time too. The same mods for a 350 will wake up a 305 like you wouldn't believe.

Let me add this btw from experience. I sold my 85 Z28 with a carbed 4bbl 305 to my buddy. I then bought my 86 305 TPI. My TPI car is all stock. My carbed 85 Z28 had a performer intake, and TES headers, cat delete, and a good stock style exhaust. That was it and that weak 155hp stock 305 stayed DEAD EVEN with my TPI. Ticked me off actually.

Good post btw.

Hi Matt.

 

^Whats up Jon?
Oh and Jon, why dont you tell them about that LG4 you had that put a hurting on a new BMW?? Remember that?

 

What were the compression ratios on both those motors? I believe the GM goodwrench is 7:8:1, as evidenced by this article: http://www.chevyhiperformance.com/techarticles/46326/

I don't think the 350 and 305 are as similar as the above post indicates. 395 flywheel hp is fairly average or below average for a nicely built small block chevy.

however, it does look like the 305 can be built up decently.