I have seen "mildly" built 305's hitting 300-320 hp. That's with the stock cam exhaust etc. It is to my best knowledge that even the "high end" factory LT1's have 280hp. Now; who did you say has the edge?

 

you mean to tell me a "mild" 305 magically picked up over 100 hp?! how about you start posting links and facts to go along with your rediculous argument.

 

back at you i guess
http://ws6transam.org/305HO.html

 

What are you smoking, bro?

The stock LG4 (the engine in question in this conversation) came with anywhere from a pathetic 145HP to a not-so-bad, but still slow 170HP. The exhaust is very restrictive from the factory... terrible manifolds, an ancient catalytic convertor and straw-sized piping. Those peices alone can cause a loss of 30HP compared to headers and 3" piping on an otherwise stock engine. The loss becomes higher as engine power increases.

Now, you say you have seen mildly built 305s hitting 300HP? Please tell me how this is possible. I might have believed you had you said 305s with a better cam, exhaust and about 100 shot of nitrous, but there's no way that a pretty much stock 305 (which is what it sounds like by your description) is going to churn out 300HP. And don't even mention anything about a "200 shot of nitrous" because it's pretty obvious any 305 would blow up with that much juice, and if it didn't, chances are it isn't stock.

And that link you provided was a pretty heavily worked 305. If you actually read it, you'd notice the author mentions ported and polished heads, a Comp 262 cam, an Edelbrock intake, and Hedman headers. It's pretty common knowledge that factory LG4s didn't come with hot cams or headers.

You can bet that he's got some work into his transmission and rear end as well, with a decently built engine like that.

In any case, you proved my point exactly although it wasn't your intention. By the guy's own account he had a best run of a 14.05 in the 1/4, even with all these mods. LT1s run 14.1 straight out of the box and have a TON of room for improvement (I know many LT1 owners' first mod was LT headers, supposedly adds a decent amount of power over stock manifolds--not unlike our third gen counter-parts).

Sorry, I'm just not buying your story bud. 300HP out of a stock cam, stock exhaust 305 is not possible... not even rating it from the crank.

 

By the way, what all have you done to your 305 besides a rebuild? Have you even been on a dyno or do you have any track times to back up your estimated claim of 300HP?

 

Why would you want to waste your time swapping an LT1 when a 350 with vortec heads and all the supporting cast will run mid 12's and you can put it together on a budget?

Do you have to deal with a visual emissions inspection, and if so, how intensive is it. That is the real question.

 

I was gonna quote your previous post but that would take up 12.5734974 pages of typing.
I own a LG4; have for 5 years now. I know of several people that have experienced 30+hp by doing a COMPLETE custom exhaust. The stock manifolds, cam, heads etc are pretty crappy; in *stock* form. Stock heads can be made to flow very nicely with some work, which is originally what I had done. I am getting new heads/intake/few other things soon.
I never said I didnt have a differnt cam, exhauast/intake etc on my 305 though, so why would you think I do? I will say one thing though, I have better headers than this guy as well Not to mention, yet again this guys exhaust is stock, mine is completely custom/mandrel bent.
I relize this guy ran a 14.0 w/ these mods, but let's not forget not only did he get a HORRIBLE launch as he says, but I have a LOT more done than the stuff he is listed which will more than make up for 50+hp.
And no, your right I do NOT have nitrous on my car; I am not a freaking drag-racer
But like you were saying; LG4's can NOT hang w/ LT1's. These minor mods keep up w/ a stock LT1, I have MANY more mods than this article..................
A different rearend/tranny? Not neccessarily. I know a sh*t-ton of third gen AND fourth gen owners that have busted into the 10's I think it was (maybe 11's), on the stock rear and tranny. (In fact they are members of this very board FYI ).

 

There are "mild" 305s hitting 300-320HP? That is nearly double the HP!

 

Thats what happens when you clear up the stock kinks in an LG4

 

85_305, not calling BS or anything, but I really want to see a complete build sheet and dyno with the motor in the car to prove your point. I've been around many, many 305 rebuilds and never have we broken the 300 mark. Not saying it cannot be done, but I know that it's cheaper to start with a motor that was designed to make more HP. The LT1 was underated at 285 for many reasons, mainly insurance. You throw an LT4 conversion on there and you've passed the 400 HP mark with ease. If you don't want a stock GM conversion kit, try some of Lloyd Elliotts stuff and you'll be pushing 500+HP in no time. I miss my LT1, it was a GREAT driver and it would thrash on many cars with ease. Bluebird5.0, I say go for the LT1 swap. It's a fun motor that you can do a lot with and I think you'll be very happy with the results. As someone previously said, check out ThirdGen.org and you'll get more info than you can shake a stick at.

 

Next summer after I finish modding/installing my T56 I will be more than happy to prove it.
I just dont understand one thing though; I posted an article that had a 305 hitting 300hp. CLEARLY stated. I have about 3x as many thing done, using better parts at that; yet there is "NO WAY YOUR HITTING TEH 300HP!!!!111ONEONE1"

 

I never said that you aren't hitting the mark, I'm just curious as to what you're putting in the 305 to get it there. If a 4 banger Honda can get into the 9s, why can't a 305 make 300+ hp? All I'm saying is, if the guy wants to do an LT1 he can find many parts and packages that will make hitting the higher HP numbers a little easier. Most of the guys I know making over 300 hp with a 305 are using N2O, so I'm mostly just curious about your build. No disrespect intended.

 

^Oh, my bad Matt . BTW.. did you notice I'm Matt too?
But I have many things in my 305; cam, head's, elec. water pump, elec fans, full rebuild, nice bump-stick, aftermarket rockers, race oil pump, aftermarket carb, aftermarket HEI distributor, dual chain HD timing set, a little bit of timing advance ( ), blah blah blah

 

lol, yea there are Matts everywhere. The motor sounds interesting. If you ever finish the build and compile the build sheet with numbers and such, let me know. I know of a lot of guys with 305s just sitting around doing nothing. Matter of fact, I was going to put one into my 81 T/A and juice it but came across a 455 Buick at the last minute. Like I said, when you're done and get all the numbers and such let me know, it sounds like an interesting kind of build!

 

Oh sure thing; I will probably make a thread on it in fact
But heck, if I could get my hands on a 455 I can guarantee you I would use that too