i need to keep about a 10:1 comp ratio for my 305 build up. dont laugh cause i will hit u with it. but i will have 68 cc comb chambers. so i need a higher comp ratio piston. Im looking AFR 190 cc heads.

 

I think those heads will be too much for a 305. They are more aimed at a well built 350.

305s can only huff and puff so much air, no matter how well built.

Vortecs would be a better choice, or Iron Eagle S/Ss or S/R Torquers.

 

i'm still trying to figure your sig, are u that dumb or just trying to act cool?

 

afr 190 heads will flow too much air for you.

a good set of heads would be the aluminum vette heads with 58cc chambers if you're looking for 10:1 compression.

i'm running a set of 416 heads on my 305 with a set of flat-tops. i'm presuming i have approx 10:1 compression. i need head work badly, as my cam pulls to 4600, then falls on its face.

i took it to 4200 or so today, and it seemed to run out of breath. i want to port my heads this winter, and rebuild them.

 

Did you mill them? because you should have 9.5:1 with 416 heads and flat top pistons. L69's and 85-87 LG4's did. To achieve 10:1, you would need roughly 54cc combustion chambers. If you're running 68cc combustion chambers, then you're gonna need 14cc domed pistons. Good luck finding a set of those.

 

If 9.5:1 is the case, which I'm not sure, could I get away with running 89 octnae gas? Reason I ask is because I have been running 92 in it so far. And I've also heard that the factory flat-tops were still slightly dished. I'm running a flat-top with no dish, just 4 small valve reliefs. That's why I'm unsure of my compression. The car pulls something mad, however Must be the cam.

Now to fix that damn oil leak, again. I'm going to try and drop the pan out this weekend, install an sce rubber 1 piece gasket, gule it in place, the go from there.

 

If it pings on 89 octane just retard your timing a degree and two and try again. It will work right after a few changes.

Personally, I'd go for the cheap 87 octane, but I'm just that way

 

no what my sig says i did. and i juss figured hell who can do 2 140' burnouts in a stick TBI 305 camaro?

but now back to m 305. Thats what i was afraid of witht eh AFR's. but i am getting a 305 TPI motor from thridgenresource complete with wiring harnes and all. So I do belive the TPI's came with casting number 081 heads which are way better than stock TBI heads so i am going to port those but I want to run 10:1 comp instead of 9.3:1. anyone know of any pistons? also does anyone know what size journal I would ahve on that 305 TPI? I will be rebuilding it and I just want it to be a little bit better than strock.... and im doing it with a 305 b/c a 350 is too much for my T-5. And I want to be different and say HA your 350 got drug by a 305. but anyways, any help would be most appreciated.

 

Check the PAW catalog, Keith Black Hypereutectic pistons for a 305. Come in 2 styles, FT with single VR ,or FT with 4 VR . Price d from $252-$364, depending on what rings you go with. If you want forged pistons, be ready to pay $400 and up Main journal on a 305 crank is the same as a 350. 2.450"

 

if you're doing your own engine it sounds like you ought to go buy a manual instead of asking on a BBS. without going out ot the garage to look i believe the mains on a 305 or 350 are 2.248 to 2.249 and the crank pins are 2.098 to 2.099. i can't remember what the tenths are, i'd have to look. the point is 2 people here have told you differant answers to your question and if one of us is right the other is wrong and you stand the chance of following some bad advice on a very critical measurement. i also doubt if you own a mike or dial bore gauge so the actual number may be meaning less to you.

 

I hate to disagree with ede, but the main journal dims are

journal 1 2.4484 to 2.4493
journal 2,3,4 2.4481 to 2.4490
journal 5 2.4479 to 2.4488

Looks like he got the crank pins (aka rod journals) right

 

well i was just guessing, but i'd damn near bet i got the mains right for a small journal crank and the pins right for a large journal. i'll take a guess and say the pins for a small journal crank are 1.998 to 1.999, but like i said i never looked. funny i can half way remember this stuff, but can never keep the SES codes straight.

 

LOL @ ede
I kinda figured it was early and you hadn't had your coffee yet

 

originally posted by streetrunner
(a) you are not being different, you are following all the simple minded lemmings that live on this site. Seems like every KID with a 305 wants to build it and claim they are different. Good luck beating a similarly modded 350...not going to happen.

(b) a 350 will be too much for your T-5, but you are thinking of whoopin' up on 350s with your 305? and that won't be too hard on your T-5? Plenty of people here with 350s backed by T-5s.

(3) What the hell does this mean: "HA your 350 got drug by a 305"
Did summer school English class get let out early today?

 

well well well. we ahve a non-believer. I dont think thqt there are many 16 yr old swith camaros let alone a 305 that they wanna modify. they all have civics with VTEC stickers. And I dont think that it is proper english to say DRAGGED so drug would proper. I drag. I drug. I will drag. Why dont you go back to school you ****ing hillbili high school drop out and thats too bad that im in the IB (International Bacherloriate) program and I am currently keeping a 3.1 GPR. But anyways, im sure your car is a fast one. But mine will be too. ZZZZZZZZ. But i have heard a T-5 ahndling the torque of a LT1 then going after 2 clutches. So I dont think I will hve too much to worry about. But you tend to your GN and i will tend to my RS. You may to try a reel good 3 row iontercooler and a Greddy ball bearing turbo T-88. Yea your right i dont know anything about cars.

 

ok im sorry the post that i had tried to post b4 mr. Grand national. went a little like this.

I dont need any of the sizes for the journals. I am purchasing a blanced stroker kit for my 305. It features a full gasket set, KB 10:1 pistons, I or H beam rods, all pins and bearings, the crank, 2 bolt mains, roller cam bearings, so thereofre i wont be needing any of the information that I hvae asked for but I thank you for your help and input. BTW the 305 stroker kit makes for 30 xtra cubes and produces an extra 115 ave. hp on a FI engine. and on my LB9 that makes for approx. 340 hp with no cam work and no head work no exhaust, no tpi mods either. im out.

 

you're a fool if you think you don't need the journal sizes because you bought "all the parts" you need from one source, or even several sources.

 

a 3-row intercooler


and why would he go with a T-88 turbo? not too streetable...

you're right, stick to your RS j/k

 

BTW i like that setup on your GN

and the IB program is higher than honors and if u graduate and pass all the IB courses basically and simply put colleges invite you in. You can pretty much go to the college of your choice. Just to give you an idea of how difficult it is to get it.

 

ok jackass it is a kit for 305's i am geting the kit that is for my year. yea ur rite i do need those numbers b/c the kit that designed for specific yr 305 wont fit... maybe NOT.

And T-88's are used on 4 cyl so why isnt it streetable on a 6? and yes a 3 row intercooler. They make them for superchargers. My mom has one with her 12 psi blower on ehr 99 Z28 6 -speed it is quite a machine. ATi Procharger.

 

i'm not even gonna bother....

 

ede. i didnt buy any of the parts that im getting using these sources, or any of the numbers u agve me i am buying it all in a kit and i have not yet baught the kit either. didnt mean to call u a jackass. theres only one way u can be a moderator. if you know what the hell your talking baout. but thanks for the input.

 

you seriously need to chill with the attitude man, some people were trying to help and you go calling them a jack *** or bragging about GPA ****..

 

And an even bigger fool if you think that you're going to take a 305 CID motor that put out 205 HP from the factory, add 30 CID or so (10%) to it, and make more than 50% more HP than it used to....

And maybe the biggest fool of all if you think that your motor will beat an otherwise identically equipped 350 short block that would have cost you around $400 less to build. You're basically gold-plating a steaming bucket of ..... excrement by putting heas like that on a 305. Won't really matter much what the journal diameters are when somebody with about half about as much money tied up in their stock-head 350 tears you a new one.

 

ur gonna need some intake and exhuast mods to make the power that your "KIT" claims, considering the fact that the factory stuff will restrict the stock engine



edit,,,,, did anyone look at his little picture site in his sig, he can spin 1 tire what he claims is 140 ft, they look more like 75ft to me, not to mention i can go park my car by a tire mark and say, "yep i did that"

 

Dude there's a lot of 16 year olds with Camaros. I bought mine when I was 16. And they do want to modify their 305's because that's what they have under the hood.

Dude, it is proper English to say dragged. Like it's improper to say "hung" and proper to say "hanged".

 

Streetrunner: You need to lighten up a little, dude. Just because someone made fun of your 305, doesn't mean you need to get all snotty and call them a hillbilly. The 305 is a decent street motor, but it is way limited. Wild, fast 305s are cool, but pretty rare, and like everyone says, it would be much simpler to go faster with a 350. I have a pretty mild build-up planned for my 305, but I see that one as 'correcting' the factory shortcomings, rather than a *****-to-the-wall racing build-up.

Regarding Board ettiquite: Don't call other board members @#$%ing hillbillies. It's not cool. If you want to talk smack, go to F-body Hideout or something, this is a Tech board. Additionally, don't go flailing about, saying things like 'You may to try a reel good 3 row iontercooler,' to use your exact spelling. I could slap your T-88 turbo on a 250ci Offy and go 300mph, but I wouldn't want to drive it to work, ya dig?
Speaking of spelling, if you want to sound like you know what you're talking about, check your spelling and punctuation. We don't know what kind of grades you are getting in high school, and frankly, we don't care. We only know you through this board, and your conduct on it. So far, we aren't impressed.

 

guys, relax.

there are people who simply want to experiment with a 305. i myself am one of those people. there is nothing wrong with that.

this is a tech site, if people want to build 305's, let them. don't try to cuss them out, or keep bringing up the same broken-record statement every time the subject comes up. we know that it is more cost effective to build the 350. some of us don't care.

effectively, anytime someone mentions a 305 or 350, it always evolves into a pissing match. stop it.

 

Good point,robertg!

 

My school didn't have IB programs. I had to take honors and AP courses, and I entered college with 24 credits already. That's well over a quarter for an average student, and no that isn't even a lot of credits. I got 4 credits for a 5 on the AP chem test and 8 credits for a 3 in AP euro, go figure.

IB will help you get into college if you get A's in it, but since your gpa is only 3.1 you're obviously not getting them. I graduated with a 3.93 and 1350 SAT and I got rejected from most schools I tried to get into. My sisters girlfriend is 16 and she has already gotten a 1430 SAT and is maintaining a 4.8gpa in IB programs. By the time she graduates(2 years, mind you), she'll be close to 1600 SAT and have the same or higher gpa. If you want to get into a decent college you better expect a whole hell of a lot of competition.

 

rezinn your sister has a girlfriend? got any pics? ok just having some silly fun.

streetrunner calling someone a hillbilly on this board is a good way to not make friends with some of the members ,same with being a dumbass and showing it. too many people have wasted their time trying to help you out, but it's appearent that your beyond any help we could give you.

i finished high school 87th out of 114 and finished college with a 3.62 GPA ,take that and a dollar and you can get a pretty good cup of coffee about anywhere.