since nobody in the Power Adder board seems to be able to answer for some reason. I've got a 305 TPI in my 86 IROC. I want to totally rebuild it and switch to serpintine setup. Then supercharge it and put it on the bottle. My questions were:
1)Do I need all forged parts since i'll be runnin s/c and spray?
2)Do I need aluminum heads because of the spray, I thought I saw that somewhere once you had to have alum. heads. Probably not, but just thought i'd ask.
3)Any recommended heads?
4)Any recommended cam? I want it to be a roller cam.
5)Intake/TB recommendations?
6)Should I get a custom chip or does my puter have the capabilites of being reprogrammed.

I don't think these are too hard of questions to answer. Unless I asked a dumb question that doesn't make sense, which I don't think I did but.... anyway thanks for any help/suggestions.

 

1. Yes
2.You never have to, but should
3.AFR
4.LT4 Hot, not real sure on this one, you need to do some research
5.LT1, HSR, etc. etc.
6.custom chip, preferbably done by you


nick

 

Probably since you are planning a time bomb is why it wasnt answered. Supercharger AND nitrous? Little overkill I think...

Anyway, to properly answer your questions you need to decide what power level youre planning on first. Just throwing power adders on a car with no idea what youre trying to obtain is kinda silly.

 

How is that a timebomb? Nobody has ever blown and sprayed a vehicle before? Don't tell me its cause its a 305. That shouldn't matter, if ricers can turbocharge and spray on 4cyl, why can't I s/c and spray on a very built 305? By built I mean, better heads, cam, forged pistons, rods and crank, better intake, runners, TB, ect.

 

The point is, it's obvious you have a less than complete understanding of what is even involved in such a project. Can you do it? Sure. Is anybody going to spell out how to do it? Hell no. Why won't anybody spell it out for you? Because there is a lot more to making big power then just slapping a bunch of part together. Slapping part together is never the answer to going fast.

Questions like what heads, cam and intake does everyone like are so old and beaten into the ground that of course you won't get a good answer to them just by asking. Better to do some searches and find results people have been getting with different set-ups and compare them to your own situation.

One question though, Why are you planning on staying with the 305. You can build a stronger bottom end for cheaper for a 350. You will also make MUCH more power with a 350 not only due to it's larger size, but also due to it's wider selection of good heads. It's one thing to stay with the 305 if you're just trying to work with what you have. It's just plain stupid to sink a bunch of money into a max effort 305 though when the 350 is CHEAPER.


Like madmax said, i suggest you form a GOAL for the car, how much power are you trying to make, or better yet, what ET are you trying to run. That makes it a lot easier to plan a combo out. Just saying you want to run a sprayed and boosted 305 doesn't make any sense though because you usually don't plan and build 10 second combos before you understand what aluminum heads do.

 

Gee, sure does sound like i'm being called stupid here. Yeah, I know to like 90% of people, building a 305 is stupid cause you can build a 350 for way cheaper. The thing is I have a 350 TPI I just bought. But, just for $hits and grins, I would like to see how much I can get outta my 305 TPI. I'd like to be able to stomp the hell outta someone with a bigger engine and then have them ask what's under the hood and tell them its a 305 they just got beat by. I know that people ask here all the time what the best heads, cam, blah blah blah are. But, i'm asking for suggestions for a 305 that WILL have spray and s/c. How many have done that, probably none. But i'm sure it can be done and if it hasn't been done before, then i'll be the first to do it. So i'm asking a what if thing here. If you were gonna do this, what parts would you use. I thought i'd already said what I was shooting for, but if not then, i'm wanting to run 11's maybe 10's. And to be street legal. I dunno if i'm not making sense here then i'll just shut up and figure this out on my own. Either way, i'm going to do this with or without anyone's help. I'm not tryin to be a ***** here, but I have an idea and it feels like i'm being told I can't do it. And when i'm told that, that just makes me want to do it even more.

 

Its been done.

I dont see the point. Choose one or the other, you dont need both to run those times.

 

Head choice for a 305 is extremely limited, some would even say it's non-existent (at least compared to the heads you can run on a bigger bore engine.) Therefore it doesn't matter whether you're running NA or blown and sprayed, you still have 1 choice, the aluminum vette heads.

The reason it doesn't make sense to build an all out 305 is simple. The bottom end will cost more than it would for a 350 to handle the same power. You'll have to run relatively ****ty heads because of the 305. And not only that, if you're gunning for 10s, you're going to want some porting work as well as a reasonable dime in the valvetrain as well. And in the end you'll still be slower than the 350. And you'll have a ****ty set of heads that you wouldn't even want to run on the 350.

If you're made of money and you can afford to build things just for the sake of trying it and blowing it up, let us know and we'd love to give you project ideas. But if you can't afford to drop roughly 10k or so (as an initial WAG on just engine, blower and nitrous costs, not to mention tranny and suspension) just for giggles while you plan for another engine then you might want to re-evaluate your plan and concentrate on building one strong running combo.

 

Actually I don't have alot of money. But, my 350 TPI I just paid off. I just would like to be different for a while. Maybe build that 350 even more than it already is, while still doing stuff to my 305. Then when i'm done, if I like the 305 better, keep it and sell the 350 to someone who could use it for a greater purpose. If i'm not, then i'll pull the 305 out, put the 350 in and already have the s/c and juice there to hook up to the 350. And sell the 305 to a v6 guy that's wanting to go v8 but can't afford a 350.

 

That makes much more sense. You do the basics that carry over to the 350 like exhaust, tranny, gears, etc. Also things like learning to tune it and race it, porting the intake, and burning chips. At the same time you learn and save to build the 350 the right way. Then when you swap it in everything will be right and you'll be jacked up like a mother out smoking rustnags.

 

No one is calling you dumb, we're just making sure you understand the amount of money, time, and research it will take to create the project you are asking about. Many people ask the same questions you are asking, and they dont understand that it costs a buttload of money to run that fast.

And if you tell me I just got beat by a 305, I'm gonna yawn, shrug my shoulders, and ask why you needed a blower AND nitrous to beat me.

 

Uhh......... LOL :sillylol:

 

Thanks for lookin out for me BTW. I'm not trying to be so different that i'm being stupid about the whole deal. It's just the thought of having a blown, stroked and sprayed 305, tearing up the streets and tracks. Then, doing it all over again only much worse with a blown, stroked and sprayed 350. I know it takes alot of research and thought to do something like this. I have done some. I just like other's opinons and if others have tried and succeeded or failed and if they'd do it over again, what would they do, ect. ect, blah blah blah, yakety schmackety. I know I have more to read and learn about, but i'm just trying to get tips here from the most experienced people with same kinda car I drive. I try not to ask a stupid question, I get those all damn day long at work, I don't wanna be one of "those" people.

 

if you're set on a 305 and you're willing to spend the jack on it why not build it around a 4.030 bore? then you'll have lot wider selection of heads. you're going to be buying a crank anyway right? so go with the larger bore.

 

I never understood why people even wanted to bother with the 305. When I bought the IROC the 305 stayed in it for 3 months before it was yanked and the 355 was dropped in. I was poor and on a timeline at the time or I would have spent the cash on the block work and crank to make a 383. I'm to the point now where my next tear down will be to stroke the motor. I give it another year before I can convince my wife that I need to spend more money on the car and have it sit around for a few months. In the mean time I need to tighten up my suspension and find a T56.

Why bother with a 305? It seems like such a waste of cash . . .

 

To you it may be a waste of cash, but to me it's not. It could go just the same with a 350, why not buy a 454 or 502? It's not a waste of cash if it accomplishes the goals you set out for it. If I want 11's at the track and I go run the first time 10's all night, that's well past my expectations.

 

Get a 302 instead of a 305, or a 327 and rev the the **** outa it.... Toss the 305 in the trash,.... I am If you goal is to run 11s in a 305, then build a 302 or 327 (something low-cube that's worth while) and run 10's, which is much cooler than 11's

 

I've seen several big-block installs in 3rdGens - it's tight and scary looking. It'd be a PITA to work on and maintain . . .

 

Nope, your analogies are all wrong here, and i can tell you why.

It's a waste of cash to build a max effort 305 BECAUSE THE 350 IS CHEAPER. When you spencd more money, to get less and perform less, we classify that as a waste of cash. The argument is not the same for a 454 or 502, because buillding and swapping one in will cost more and require more skill. The 350 is identical to the 305 in every respect except bore diameter.

But actually, the argument does hold for building a big block if you really step back. If you want to build a streetable 11 / 10 second car, a big block swap is quite frankly an option on the table if you ask me. Making the power you want in a big block is easy, and swapping it in isn't that much more work.

Thats what you missed in your analogy. You think we're just calling things wastes of cash because we're being snobs. No, we're saying they are wastes of cash because it's a longer harder road to your goal. In the case of a low 11 or 10 second 305, sure it can and has been done, but i guarantee they were all done by people with a helluva lot more knowledge and experience then you do.