Ive been wondering is it posable to make a 19991 Rs run Mid to Low 13's on the stock l03 and ive been wondering what would it take to make a l03 run thoes times n/a? any help would be great thanks

 

not with bolt-ons

 

I've never seen an L03 get into the 13's with bolt-ons... and I probably never will. Easiest "bolt-on" and 13's with a stock motor is a 125hp shot of nitrous. No amount of bolt-ons will make the engine faster... don't take this the wrong way but it's kind of like those ricers. They start with an engine that was ment for economy and after bolt-ons they're left with a motor that doesn't know what it should do. It no longer gets good milage and it still is slow! In defense of doing bolt-ons to a stock L03 is cost and potential. Once the L03 quits, the bolt-ons will work nicely with any other small block that is put in it's place... hopefully not another L03 .

 

amen....

 

Hey Nick: Since those 65# injectors were such a horrible idea (per your sig) can I buy them you? PM me.

As for the topic at hand, as long as that broomstick that they call a cam is in your motor, you will most likely be limited to mid-low 14's off the juice, but on it, you can most certainly hit the 13's.

But 14's are still kind of fun and will hand most ricers their ***, however, the new ones coming out tend to be mid 14 second cars off the floor, so pick your fights wisely and don't talk a lot of ****. But hey, atleast they don't look as good as we do.

 

Hey welcome aboard. You will find that bolt ons will wake your car up but only take it so far. The LO3 has much worse problems than just a restrivtinve exhaust and intake. Check out the stcky at the top of the page and you should have a good idea of what makes a TBI car tick.

https://www.thirdgen.org/techbb2/sho...hreadid=227281

 

define bolt on....

 

now thats a bolt on, lol

 

Well thanks guys helped me out alot im am still testing the waters i dont know much abot this car.. i asked the guy i bought it from 2nd owner and he says its a 350 with no aftermarket parts and im am leaning twards that cuase its got a biger oil pump and this car sound nothing lke the other RS's on stock exaust you can hear me comein down the block and another two reasons are the intake has some sealer pokeing out so i see the intake has been taken off and i found a car in the console when i bought the car its from a local engine shop so i am quite exicted about it being a 350 ive looked for the casting number but i dont think i want to take off the alt just to see im am going to tune the computer and get a valve job soon or might just buy new heads im not quite shure ill find out soon enuf and thanks a million for explaining the idea of an lo3 i am new to computers ect i grew up with my little brother and pops fixing his 69 z28 with the ls-6 chvelle engine so all i knew was puting on heads a cam ect ect.. this being my first car im excited and have millions of ideas lol but my dad already told me no matter what engine it is this is the nicest first car this familys owned lets keep this one mild and lets take our (300 dollar 85 sc) and make that our wild car and i think ill stay with that opinion he has been raceing since he was a kid so itend to go with that but i thought id get you guys opinion on if i did indeed have a l03 beuase hes never worked on the computer cars so its a first for us all lol. anywho weither i have the tbi 350 (lo5 who knows lol) or the l03 your help was greatly needed

 

Actually I saw two L03's break 13's N/A last summer just not with tbi they had carbs. I actually talked to both of them and after they told me everything they had to do to get them into the 13's thats when I decided to ditch my lo3 and go with the lo5, now im ditching the l05 but thats a different story. Oh and the casting numbers on your engine should be on the back of the block behind the intake manifold by the drivers side head its hard to see but its there. If I were you I would definetly check. The guy I bought my car from was a mechanic and he told me the same thing and I found out it was an l03 a week later. Didnt matter becuase I ditched it and got a 350 anyway but it would have been easier if I started with one. Good Luck.

 

When you mean its hard to see do you mean i wolnt see it unless i take some stuf off or its just hard to worm my way in there? anywho was talking to a guy next door who has a iroc-z 350tpi and i mean this stock little tbi 305 350 what ever on stock exaust sound meaner than his stock 350tpi so its persuadeing me i think i will go look for that number right now alright later

 

Well I had to remove my spark plug wires and move my coil and throttle bracket out of the way but thats nothing really, just be sure to hook everything back up where it belongs and label the spark plug wires if you dont know where they go off the top of your head. After that just get in there close with a flash light and you should be able to see it. If you dont want to do it just have them check it when you have it in the shop. Another way you could check is by taking on of your valve covers off and getting your head casting numbers. Chances are if you have 305 heads you probably have a 305. Good Luck.

 

Periods and comma's are our friends. Please please use them.

 

Was gona pop the vavle cover and check the numbers on the heads but no money to go and but gaskets from auto zone.plus i dont think leaking would be very fun but ive also found to things that dont sound quite l03.First off as a friend noted and i didnt when i give it 25 to 50% throttle the low end torque is lifting the body up off the shocks and also when i first gotthe car we had not so much money for 93 so i bought the chepo $1.74 and the engine ran like crap i mean it ran BAD but on 93 the 2 dollar burn my mney up gas it ran GREAT!!! so i am thinking thats a little more proff but still the high commpression needs that higher octane but im geting the computer tuned by a friend soon so ill seen then thanks for your responses and all but shifty being a little less rude would also get more thanks but still thanks for your little sticky new all that from learnnig from my pops and engineshop in school but its great for newbies.

 

I didn't mean to be rude but I can barely read your posts. I was just making a suggestion to make it easier for us to read your posts and decipher your problems. It sounds like you have some timing issues as well. You should be able to run mid grade fuel with a few degrees advanced without any knock. A quick casting number check will tell what motor you have for sure. What is the number on the head when you pulled the valve cover. The last 3 digits will tell you what casting you have.

 

lol got nerveous didnt pull the covers cuase i didnt have my gaskets i pla on gonig to auto zone soon right afteri air the tires. ones got 5.psi lol yes indeed its robing a lil bit of power so i will have to hurrry get a dollar and get my tires nice and aired.

 

First , How much did you pay for this RS?

Second, Bad front struts would make the car seem like it has more than it should cause they can't control the lifting action or acceleration.

I run the cheap 87 octane gas without a problem.

The only way to tell if its a 350 is to look on the side of the block and look for the casting number. Best seen from under the car looking up with a flashlight. If its 627 (I think) than its not a 350.

 

Oh yeah I forgot about that. There is a 3 digit number on the bottom of the block on the drivers side get that number and post it and then we will know what it is. Also just because it ran like crap with the low octane fuel doesnt mean its a 350 it could be a 305 with a ton of compression. The guy that had the car before might of just had the originall 305 rebuilt with a little bit better cam and higher compression pistons and since it had a little more power he probably thought he could pass it off as a 350 thats what the guy that sold me my car did. Good Luck.

 

Every motor becomes a 350 when someone goes to sell it. Ive found a few of those rare 350/5spd factory setups for sale locally

 

lol, the best one ive ever seen personally was an old Highway trooper car i went to check out. A 92 with RS badges but a 305 TPI motor, 140 mph speedo, posi, 4 wheel discs and a 5 speed. All in all a nice car except for the fact that the morons selling it had blown the motor and put in a 350 engine of unknow origin. They tried telling me it was a stock replacement motor but i tried mentioning to them that:
a) GM never offered a 350 w/ a 5 speed
b) Police package cars were never offered, i think, with a 350.

I even showed them the RPO code to no avail. Even though i knew i wasn't going to buy the car, i still took it for a test drive and i gotta say it still hauled ***.
sorry... thats a sad story.

BTW, welcome to the boards dude. As everyone else has said, its best to go with the 350 engine and stuff instead of the 305. Getting that kind of power out a 305 would be too much of a headache, IMO. Its not impossible, nothing is, but it would'nt be easy.

 

yeah all good points. But i think theres alot outweighing the 305 i mean the engine was taken out to paint the engine bay and i dont think anyone would take the motor out then put the stocker back in. its got the stock intake and tbi but hey some of us dont have enuf for a turn key so i guess he got a long block and there also a 160 thermo and high presure oil pump and new water pump and ratior in the engine. also its got stock headers and a broken smog pump on it lol. but i tryed geting under the car and it was way to low i was hiting my chest on the underside of the car so i guess i gota jack it up or remove the valve covers. but i payeed 3000 for the car i bought it cuase i loved the car i saw the car and melted.i mean he wanted 4000 but since hes a family friend we got it down to 3000 its got an almost perfect interor and year old shiney glossey paint he told me everything is orignal but a new spoiler and a 350 and i dont think a family friend would lie for no reason i mean he bought the car for 2000 painted it and put in a 350 and this ia a good paint job they painted the whole car even the engine bay and the inside of the doors.so im asumeing the engines been taken out its got the gm 1991 tela paint witha nice black stripe on the cowl i mean you would thinks its from the factory teal but the title says she was a blue car first. anywho i payed for the car not the motor i care about my car not about my engine if it has a 305 so what thats nothing i cant fix.i mean the engine is part of the car so i care aobut bolting on as much as i can but i mean if its 305 os what if its 350 its just iceing on the cake.also if you wana see it its in the south east members rides stickey post

 

A body guy I talked to told me they could do the engine bay without pulling it, but it just wouldn't turn out as well as if they did pull it. It could have gone either way. And there are plenty of people out there who just take there car to a service station when the motor blows and pay $2000 or so for a stock replacement L03.

Stock headers? I think not.

 

ok ive got the castin number of the heads what now

 

What is it?

 

Dangit went on google and got the casting numbers and found they are 305 heads oh lord l03 anyways all hopes arnt ruined. i was talkin to my dad and he raised my hopes by tellin me a story of his friend who used to race in the old "stock" class where all you could do was bolt ons new internals ect but could not change the block and he told me the guy took a 307 and made it run soild 10.8's n/a. so theat gave me soem hope i was thinkin i get some nice 10:1 pstons a nice crank and rods a nice sold camshaft some good heads and valves good valve train intake and exaust a nice driveline i could brake in to the 13's with an l03. you just gota do every thing not jsut worry about hp but about how your gona put that hp down. thanks for all the help this is gona be a long journey but i think this little 305 will make it

 

Are you sure they are LO3 heads? What are the last 3 numbers of the casting. There were many 305 heads offered over the years and some were actually very good. The LO3 heads were pretty much the only 305 head that was worthless. The 416's and 081's are gems.

 

187 i do have where might i find thoes "gem" heads?

 

You can find 416 heads off a whole slew of GM vehicles of the 80's. I mean practically ever 305 car came with them. The 081's could be found on 1987 and later 305 TPI cars. Ebay, local and board classifieds, and junk yards are your best place to find them.

 

I see i have a 1985 sport coupe with the carb motor i tink its an lg4.and its drive line is going out for parts soon anything worth while for saveing to put on for just now?i plan on geting the world products s/r heads and the lt4 cam with a nice valetrain a edelbrock inatke holley 670 tbi some 10:1 pistons 3.73 posi drag radials alum driveshaft and a rebuilt tranny hooker long tubes hooked to a 3' flowmaster system what kinda times should i expect with this sort of setup?
*edit*
i will be running some sort of new converter i dont know how high of a stall i will need though mabey 2500 or 3000?

 

Save the heads off of the LG4. They have the 416's I keep mentioneing. A little machine work on those and you can have a great set of heads. You cannot accurately predict times. It will all boil down to your tune. It is tricky to get your tune right under the stall converter.

 

Alright ive went shoping on jegs and ive come up with a combo.
"Holley 670 tbi
World Products s/r torquer 305 heads
Flowmaster 3' exaust
Hooker Supercomp shortie headers
Edelbrock Performer Manifolds - Power Package
Easton Posi Rear 3.73 gears
Bfg Drag Radials
B&M Coverter Total:$3016.88 "
pluged it into a desktop dyno and it said i could get a solid 343 hp and 356 footpounds of torque. lol and yes i know yall think desktop dyno is a little off. has anyone read a newer hot rod the one with the gan turenos on the front they got the cars from the movie "starsky and hutch". yeah and well they did a test in there and they found it was only about 2hp off the real dyno sheat not bad eh? and i feel with this set up and many many many hours of tuneing and worknig my *** off for parts i could run a soild mid to low 13 whats your opinions?

 

oops ment to post new topic

 

My opinion is you plugged your numbers in incorrectly or DD is screwed.

Build a 350.