12sec and 20mpg

I was hoping for any help with this I have a 91 Tpi 305 H.O. with a t-5 and 3.73 limited slip rear. my goal is a mid 12s with 20mpg i want a t-56 for the trans but my biggist concern is power potential of my 305 will it be feesable to make the 400 or so hp that ill need to make this happen without major engine mods. im hoping to do this on all motor or would an engine swap for a crate engine be better/cheaper?

I think your best bet would be to go with a 383tpi and a built 700r4. Performance automotive and transmission center sells pretty reasonable trannies. I don't own one but i've heard good things about them

whats the power on that?

depends on how you build it but you can get an easy 500ft-lbs at the crank. with your 3.73 and slicks that shold get you close to 12's and with the 700r4's overdrive and the tpi i think you could get 20 mpg as long as you don't go too wild

You COULD get 400 hp out of the 305 but it would most likely require a super charger. If you do go with a 383 tpi motor, I would stick with the T56 tranny. The overdrive on that is better than a 700r4 and those can handle the hp from 383 just as well.

what the hell ever happened to 92RS?? well he had built his 305 to manly proportions. not gonna give a hp number cause i dont really remember what he said, but i do know the 305 can move if done right...

man thats the exact same thing ive been thinkin now for a while.. where the hell did 92RS disapear to?? and 92rs stroked his 305..... i picked up a stroked 305 a few days ago for 50 bucks... but i think im gonna rebuild it... know if you want a 12 sec car and 20 mpg... you could stroke you 305.... possibly supercharge/turbo it.. or hook up some nitrous.... now if you plan on running a heavy shot or nitrous make sure you build your motor to handle it same with turboing and supercharging... high levels of boost will blow out regular head haskets

:iagree: Build it for nitrous. You get normal gas milage and when you want to go fast, you hit a button.

sounds like a plan

I understand the nos theroy but will my processor be fast enough so that i dont lean the shit out of it the first time i hit it? a stroked 305 sounds good but what you end up with is a 350 and its still a two bolt main. anybody know where i can get some 6in rods for it? and a vortec head compatable base plate.

one of the best places i have found for vortec heads and stuff that goes along with it. if your going to run a big cam make sure your heads can handle the lift. otherwise just get one of SD's vortec head kits that comes with heads already preped and all the gaskets and the intake of your chioce. i think they have a kit with the TPI baseplate. heres just the baseplate though. http://www.sdpc2000.com/cart.asp?action=catalog_start&catid=1460

any of you guys ever buy anything from Tpis and if so what and was it good and performed well.(like air foil, large tube runners,etc) and whats the best off stock mods i can do to get the best gains in hp and higher rpm performance.

TPIS is the shiznit. They are expensive though. For the large tube runners, I would get them from Arizona Speed and Marine. They are exactly the same as the TPIS runners, they just charge more for them.

yeah, id say 12 and 20 is a high demand on a 305, but to get it youre gonna wanna focus on combustion efficency, the vortec heads and tune port is an awesome way to go. stick with a smallish cam, say an xtream energy cam from comp cams, XR258 or XR260 or something along those lines. thermal coat the combustion chambers, antifriction coatings on the bearings and piston skirts, if your gonna get a set of 6in rods, i reccomend eagle H beam rods with the baby bearings for reduced surface area on the bearing and less friction, an accell superram plenium and runners would definatly help out. also, im thinking you are gonna want more than 400hp to get into the mid 12s, gotta remember third gens, and most all camaros for that matter are big girls, 3400lbs or so, so you need alot of power to move that fast. im looking at getting 380hp out of my 350 with some simple mods, and be running mid to low 13's. maybe busting into the 12's.

I still say the hottest thing out there for thirdgens right now is a 383 with a 6 spd tranny. I think almost every car magazine by now has built a 383 that puts out over 500 ft lbs of torque. Most people go with the superram or the miniram. Personally I want to keep the stock look of my TPI system so I will be replacing the base, plenum, and most likely the throttle body. The upper plenum can just be ported out a bit because they have no problems feeding a big engine.

Basically if you have the cash, dump the 305 and get a 383.

Also http://www.spohn.net/ makes some high quality suspension goods for when you need to upgrade. They sub frame connectors, which are basically a must have for a powerful engine, are pretty much the best brand around.

well, i only reccomend the superram for high rpm applications, which would be needed for running 12s, a ported stock plenium wont touch the advantages of the larger plenium and shorter runners of the superram, which extends the powerband from 4500-5000 to 6500 wich is priceless at the track. im building a high winding 302 and am searching for the plenium and runners, to match to a vortec baseplate, and vortec heads. but thats just me.

The stock upper plenum is never usually a problem when people are building up an engine. Its the fact that the long tube runners are more torquey and aimed at low-mid range and alot of people prefer the short runners from the LT1 and anything like that. The actual plenum itself flows plenty of air once you port match it with your larger runners.

the lt1 type intake dosnt have the asstetic appeal i like the look of the Tpi when its all polished up but the loss of high end power is the problem that i see with it. what is the super ram? lt1 style intake?