devestator_x

iTrader: (1)

Im getting an LG4 car next week and was wondering if 300whp is obtainable from a 305 on a small budget. I realize swapping in a 350 gets me there alot faster, but why swap out a good motor? Whats it take to get into the 300hp range? i want to match the peroformce of my old LT1 in my '96 Z28 that I had.

Im thinking, performer intake, L98 aluminum heads, headers, catback, cam, well done tune, ac delete, smog delete (removing the belts from each pully) Cant think of much else and am not sure where this would put me in terms of power. I know you can get close to 300 with an LB9, but it costs a whole lot more.

One last note, where would all this put me with a 350 block, because that isnt entirely out of the question, just would be delayed a bit. im not trying to start a 305 vs 350 thread so please dont take it there, I know a 350 puts out more. I am just trying to work with what I will have and will swap as a last resort.

johnnyboy

iTrader: (3)

it would be a lot cheaper and more easily attainable with a 350.

devestator_x

iTrader: (1)

I understand that a 350 is cheaper to build, at least internally. Externally it all bolts up the same, which is what Im looking at. Basically my questions are
Where does my selection of parts (I know I dont have a specific cam picked, it'll be something not too radical, this car will be a daily driver) put me for horsepower with both the 305 and the 350? If 300whp is not made with these parts on either motor, what does it take to get there?

Essentially i have 4 questions
Will these bolts ons make 300whp in a 305? If not, what else do I need to add/change?

Will these bolt ons make 300whp in a 350? If not, what else do I need?

I am trying to plan out a budget and a timeline to build this car up, so more detail is better than less.

RArnold

From what I've learned over the past year or so, with a good boost in cam specs over stock (nothing radical) that should get you close to 300 in a 350 sbc...........not sure how to figure how much less it would be in a 305.......

ChillPhatCat

A 300 WHp (lets just call it 350 at the flywheel) Bolt on 305 is not going to happen ever... unless you call a turbocharger a bolt on. You need to at least get a good set of heads and matching cam along with intake, headers and exhaust... it's going to take a fairly lumpy cam.

johnnyboy

iTrader: (3)

i would have given more detail but i'm not an engine builder, don't wanna say anything stupid because i don't know what i'm talking about.

blimko

iTrader: (1)

if i were you i would look into the mods that you plan, cam intake headers good exhaust upgrade tbi or tpi, heads, and GOOD TUNE...from there you will be in mid to high(if tuned correctly) 200's. check the power adder forum about the 305 stockers pushing nitrous. with your new set up and a 300 bucks worth of nitrous, you will be into the 300's range. hope this helps

Berlinetta00

You never said the most important part of any build: the cost. What does your budget look like? It may be that 300 hp is an unrealistic goal for the money you want to spend. From what I have seen, the amount of work and money that goes into a used 305 to bump it up to 300 hp would easily buy you a nice crate 350 pushing at least 300 ponies if not more. Another thing to consider is the mileage on the engine currently. If it's got 150,000+, you are looking at rebuilding the lower end as well. Chances are the rotating assembly can't quite cut 300 as easy as it would new, which becomes even more true if you have bad rings.

Camaroz29

iTrader: (3)

Add a large solid roller cam to your list of bolt ons and that'll get you close. Pocket porting wouldn't help either.

devestator_x

iTrader: (1)

Thanks for all the input guys. I asked this same question on the TPI forum a while back when I thought I was getting one of those (deal fell through) They were pretty optimistic about getting close to 300 on a 305 with the TPI setup. I know its easier to make power with a carb so I figured it would be even easier than the TPI.

I guess Ill grab a 350 long block from a yard, have it looked over, and toss it in. Then bolt on everything to that. ( I consider heads and a cam bolt on because there isnt any machine work involved in installing them.) My budget is really low (about $100 a month if that) so progress will be slow which is why I want to plan out a timeline and what not, that way I can get a projected estimate on when it should be done and double that amount of time...lol.

TON*LOC

http://www.goingfaster.com/spo/carcraft325hp305.html

91 camaro racer

iTrader: (2)

if you search differnet websites there are people making good power out of a 305 just have to look around

Sonix

iTrader: (1)

Fast355 built a fairly aggressive 305 that put out ~425hp. 11's in a lightened 3rd gen. He says it's not that aggressive as far as lumpy-cam characteristics go, but i'm skeptical. Not a true budget build, but TBI and factory style heads IIRC.

You can build up a relatively aggressive 305, then swap it all over to a 350 block later.
Look at my 350 build. That's about a 350HP motor right there. If it were in a 305 it'd be a tad less, but the thing is, it'd be driveable in a 305. When/if the 305 short block dies, or you run into some cash, it all bolts over onto a 350. It's somewhat tame in a 350.
The cam, heads, intake, carb, headers, all would work nicely moved over onto a 350.

Orr89RocZ

iTrader: (20)

not as hard as most think...it can be done... bigger cam yes but can be done

not quite a budget thing tho...but i wonder if you could use vortec heads and a performer rpm vortec intake. cam shaft will have to be nice sized...rev up to over 6grand for sure. something like a 224/230 cam may work if the heads are nice. ported vortecs would be awesome. vortecs tho are as budget head you can get.

better yet are trickflow small bore heads...new and look promising. comp cams XFI 218/224 may get 300whp. it has made 360ish on 350's. else step up to a 230/236 cam...next level up. will rev to 6500 easily but will make power.

low end wont be there but it will come on like a frieght train once u hit 4000 rpms lol