i want to have a fire breathin 305 and im pretty sure i have a sound combination but i would like numerous opinions ported 305 tpi heads (or afr 180's) superram base (maybe a siamese on it) slp runners fully siamesed ported/siamesed plenum tuned equal length headers and a lt4 hotcam would i get around 400 horse with the ported 305 heads and how much more would i get with afr 180's and also are the 305 tpi heads angle plug like the L98's? so i know what afrs to get if i go that route thanks alot guys!! i really appreciate the responses in advance

I really strongly suggest that you get AFR 180's if you want close to 400hp out of that 305.

The 305 TPI heads are not angle plug heads. They're straight.

yea the lt-4 hot cam is wayyy to small for what ur lookin for
...... u need like a dual pattern hydraulic roller cam with like a 290 something duration and like a .512 int lift with like a .520 ext lift..........

u'll need like
1.7 roller rockers
fast bleed hydraulic lifters
hardened pushrods
rebuilt bottom end... new crank..rods...pistons
u'll need high commpression pistons u want like a 10.5-11:1 comp ratio to be able to hold that cam
u'll need new heads.... then port them so more
i wouldnt go runners i would go lt-1 or ls-1 intake but ur best bet is to go carb to dump the most feul in there.... like a 700 r 800 cfm carb with a massive intake manifold..... and msd ignition....at that point...... u'll need like a 2500 or 3500 stall converter b/c of the size of the cam..... then u'll need like a turbo 400 trans with hardened clutches and ****...... then a nice sturdy driveshaft with a nice rear..... 3.73.... maybe 4.10 or 4.11...... and some big sticky tires..... but its way easier and less expensive to do this to a 350

squzin 400 hp out of a 305 is a tough one but with the money your gonna spend it might happen. let us know how it goes

Yeah, you are definitely at the cringe point when you want 400 hp from a little old 305. It gets SO expensive that it is much cheaper and easier to do with a 350 shortblock. And it will let you drive it to the store and back without all that drama.

But, if you love all that angst and adventure everytime you fire up the Camaro, 400 hp has been done ...

Personally, I'd shoot for 300 to 325 hp and add a 100 hp snort of nitrous, for those moments when a Vette needs to be put in its place

First of all you can't use an LS1 intake, no matter what marshall says. Without a power adder this car will not be very streetable, that's the way I think you should go. I really doubt you'll pull anywhere near 400 with that LTR setup. I've seen L98s with better things than you listed making 350-380 horses with that cam.

Please do not use a 305. You are going to spend more money to make that 305 do what you want it to do than it would cost to build a 350. 305's make me sad, and they make my car sad. Please don't make my car sad.

o yea my bad u'd need ls-1 heads for that.... didnt think about that one..... btu yea doing that to a 305 is a waste of money and will b in the long run.... gettin it to about 270 -300 is more reasonable

And a LS1 block. The LS1 is a totally different animal.

Any block with larger pistons will have a larger surface area for the combustion and in turn will make more power. Think about that one.

http://www.angelfire.com/nb/thirdgen/343hp305.html
http://www.angelfire.com/nb/thirdgen/400hp305.htm
http://www.goingfaster.com/spo/325_h...chevrolet.html
These links may give you the general direction you may want to aim for.

well the reasons i want to keep it a 305 is because i dont have the money to buy a 350 block and rotating assemly so i wanna work with what i have and its a 305...i talked to a few different guys a afr today and asked him what would i expect from a set of 180's intake work headers and a cam (he suggested a comp cams 280hr) he told me between 375-400....he put me to a another guy from the tech department and that guy told me a litle under 400 and between 380 to 400 ft lbs.....
i would love to have a 350 but i dont have money to get a block and full bottom end then start the top end....when i can use my block and bottom end and just bolt some goodies on top and have 350+ horsies and a 100 shot of squeeze

305 are GAY

thats real smart to say considering half the whole baord has one

if u have nothing nice to say or n e thing to contribute other then dump @ssed comments then dont bother posting....

why build a 406 if u cant afford to put in a posi...and u got balls to say 305's are gay SO ARE OPEN DIFFS

406's that run 13's are k0o0o0o0ol




not really

lmao@marshall

a 13 second 406
325 horse ls1's run 13.20's lol

300 hp and 75 to 100 hp from the bottle is a much more achieavable and less costly route. And the thing will be driveable on the street.

Forget about the AFR heads and whatnot. You could buy a newly rebuilt 350 shortblock for that kind of money. If you are on a budget then get wise and do up your 305 heads. Done properly they will support about 460 hp--no kidding. Look at my thread on this board about porting and polishing 305 heads. There are even a ton of pictures.

Thanks man, I needed a good laugh.

sitting bull...are u doing the 305 tpi heads?? would they be any different porting wise then the heads your doin??...i owuld love to get atleast 3 and a quarter...and how much can the stock tpi base be massaged im going to siamese it along with the runners and plenum...with the stock valvetrain how high could you actually rev a 305 tpi without problems i know it stops makin n e real usable power above 4500 so with a siamesed base runner and plenum how fast could i really spin it with out floating a valve or breakin a spring...the stock cam has decent duration figures but it just needs some lift so ill toss on a set of 1.6 rockers to help out a little but im going to eventually put a cam in it and build up a 350 but for now im gonna get what i can out of the 305 and have some fun with it then get serious with a 350....

the lt4 hot cam specs are
218 int duration
228 exh duration
.525 int lift
.525 exh lift
112 lsa
this is with 1.6 rockers

Only have time for quick help out. I'm not sure what heads the TPI 305 has but I'm pretty sure that they will be good for porting. Use my instructions. (The TBI swirl ports are about impossible because of the push rod placement in the intake port.) The TPIs don't want to rev but siamesing the runners has apparently helped.

If you are willing to get dirty and do this head and runner business, then you can make hp on the cheap

Since you are TPI, go to the TPI board and ask them exactly how they do their runners and plenum for max performance. I think they basically get their engines to turn 5200-5500 when massaged. That is easily within the limits of the other parts in the 305.

Then you just need a good cam, but that will depend on what cam works well with the head and runner porting. The TPI guys can help you there, too. Just ignore the ones who say "go 350." They are everywhere

The beauty of what you are doing is that all your ported parts will work perfectly on the next smallblock you get, whether it is a 350 or 383 or whatever. Ported and polished 305 heads DO rival Vortecs--and Vortecs are what come on the ZZ4, the RamJet 350 and the GM 383s!!!

No, no, NO! ZZ4 has aluminum L98 heads, like '86-1/2 -on Vettes... (no bull )

sitting bull that you for your help....i went and looked at die grinders today and i saw one at home depot...i think it was a smith ofenhauser or a chase fousenhoser or some **** like that lol...its was 20 bucks 6 psi and 25,000rpm

305 TPI have 416 heads. I hear they are the better of the bunch for porting.

OK OK, you doubtless have me on that one

I think you would be much happier renting an electric die grinder like I did. The air powered ones use a lot of air, so you need a hefty compressor. If that is not a problem, then go for it. But if it is, rent an electric one for like $30/week. That's all you'll need. They spin even faster.

But get a 6 foot extension cord and a 5 amp light dimmer switch, wire it in and you can control the speed of the grinder. Works great.

Then get the Standard Abrasives Basic head port kit. I found the Deluxe one to be rather overkill. You will need a few carbide cutters. Take a look at the ones on my thread and get them, except for the totally pointed one. It was of no use to me at all. They don't cost much, maybe $8 to $12 apiece. Also, get a short one just like the long one, it is very usefull in the pocket/bowl shaping. And another like the long one, except with a longer thinner cutting head. That works well for cutting back and shaping the valve guides. So, 4 cutters for about $35. The Industrial Supply/Welding shops carry them.

And grab the head porting instructions off the Standard Abrasives Motorsports website. It is in pdf and you can just print it out and set beside you while you work.

So do the LG4's and L69's. I've pulled 416's off of all these engines.

a couple more question and ill have all (i hope) of the info i need...were could i rent a die grinder? what gaskets should i use to match and how much intake port material should/can be removed?

Phone the local tool rental places. Someone will have one.

Standard 305 head and intake gaskets. Since you are doing the cam and stuff, as well, just get an entire engine gasket set. It will be cheaper.

You'll see as you go along just how much must come off to smooth each area out. Don't worry, it will become obvious.

Follow the way I did it on my thread.

GOLD85: OPEN REAR ENDS ARE GAY!!!!!!!

BTW....13's w/ a 406 is a joke

one more....if some with DD2000 reads this could u please run it?

ported 305 tpi heads (or afr 180's)
superram base (maybe a siamese on it)
slp runners fully siamesed
ported/siamesed plenum
tuned equal length headers
the lt4 hot cam specs are
218 int duration
228 exh duration
.525 int lift
.525 exh lift
112 lsa
this is with 1.6 rockers

whoever does this for me THANK YOU!

DD2000 does not have the ability to figure in ported plenums or runners. So you will just have to take the educated guesses of the guys on the TPI board for what you are doing.

And the LT4 Hot Cam is just too big for a 305 like yours. Try to find something more in the .470 to .480 range for a roller cammed, street driven 305. The Hot Cam is meant for a 350, naysayers notwithstanding. It just won't produce power until you are well up in the rpm range, so day to day driving will be a royal pain.

Sorry

This will give you a rough idea of what it will look like. I created a custom airflow file for the ported 305 heads, so that will be pretty accurate. But the plenum, runners and whatnot are not programmable. However, you could reasonably add 10 or 15 hp above the 4500 to 5500 rpm level to account for it. The torque would also probably extend a little further along the rpm scale before tapering off.

I also substituted a Comp XR252 cam of nice lift and duration for your 305, like I mentioned previously.

These numbers are all at the flywheel, with no accessories taking hp. It would probably give you around 220 - 230 rear wheel hp, which is pretty darned good. A lot of 350s don't have that.

This will be a very torquey little engine with decent horsepower, too.

A good low 14 to high 13 second quarter miler. Then add in another 75 -100 hp with nitrous and ... you get the picture

Here are the hp and torque tables.

i like the way that torque is looking ...torque is what moves the car and 400 ft pounds is very appealing...i dont know what my car runs in the 1/4 but im door to door with 2002 gt poop stangs to 120 and i lose only about a car lenght to lt1's to 100 so im guessin 14.2 14.3....i can drive a stick very well so im guessing that helps quite a bit but i must have a "built on wednesday" 305 cuz its very strong...

Well, your new 305 is going to keep right up to Z06 Corvettes, once you feed it the happy gas. Imagine the looks on their faces when you inform them that they just got their asses kicked by a "gay" 305

AMEN TO THAT! Anyone who builds a big motor and doesnt take the time to put a good rear end in is really confused. But hey, even if he did hook, look at that MPH....102? that really is all the motor has got! can we say pathetic? Hell, when my car was 305 TPI bone stock with a 125 shot it went 13.2's.

JMAO:I really liked my 305, but so much more can be done with a 350.


I remember that one guy running 9.9X's with a blown 305 TPI pushing LOTS of boost.

It all depends on how much $$$ you want to spend.

ohhh a 350 is the way to definetly the way to go.....when u have the money to build one....but for most of the guys with 305's why not port out the heads do some intake work put a bump stick in it and be happy with stompin stock or lightly modded stangs....i know when i get the $$$ im gonna put a 350 in it with my ported 305 heads...then have some fun

You guys with 305's need to be honest. With the amount of $ you spend on the 305 you could have had a 350 with 100hp extra. All you need to do is be PATIENT and save your $ for ONE purchase, instead of 100 little purchases.

Belive me I know.
my camaro = slow
I don't HATE 305's just dislike. will not spend another dime on my 305!!!!

actually the only $$$ im putting into it right now is a cam..im porting my stock heads which will support 460 horse siamesing my stock manifold base siameseing my stock plenum and runners..ohhh and a set of headers...so i will be over 325 horse and 400 ft pounds for the price of a cam headers and a porting kit...ohhh **** cant forget the price of renting a die grinder....
so what 600 700 bucks tops....

cool.
Those number sound do-able. Just wanted to make sure the 400hp was not still being thrown around.

After 350hp gains are hard fought for most NA small blocks.

ohhh ill get my 400 horse i just may be "laughin" when i get it lol...but as of now ill get between 325 and 350 and 400 and 425 ft pounds and that is very duable....

Everything f-crazy is doing will tranfer straight over to a 350 when the 305 croaks. This is NOT wasted time, effort or money. It is by far smarter than tossing a perfectly good 305 and paying out $1200 for a rebuilt 350.

You guys in the "350 uber alles" gang should learn some basic economics and accounting before handing out advice on how to build an engine or pay for it.

Here's some data from a CHP article on a 387hp/305[dec. 93]. AFR Heads 58cc - AFR cam 218/223 dur.@ .050 460/470 lift w/1.5 rockers,1.6 rockers were added. APPOX. 9:1 comp. w/ TRW ft pistons[.030 o.s.]. Edel. RPM intake and Holley 650 dp carb. jetted down to 60/62[still to rich] and 36 degrees spark adv; engine idled at 750 rpm w/13.5 ins of vac; eng.put out 387.1 hp @ 6000 rpm's and 367.6 lb.ft. torque @ 4000 rpm. My thoughts are that you could use a set of alum. vette heads[pocket ported/ 9.5:1min.]which have an excellent intake to exh. ratio and make 375 hp using a hyd roller cam[their's was a flat tappet].

there are endless possibilities witha carb setup...but i want to keep it tuneport for a couple reasons mainly TORQUE....sure that carb setup mabe 387 horsies and 367 ft pounds...but just with a cam and ported 305 heads im sitting at 300 horse and 380 ft pounds...do some intake siamesin and some minor cost free mods headers and ill be in the 325-350 range and 425 ft pounds..ill give up 30+ horse but ill take that 50 ft pounds over the horse n e day of the week
and like sitting bull said these ported heads will support 460 horse and will bolt up to n e motor i put togerther in the future...
theres a guy on this board that has ported 305 heads making hella power on a 400...like sittin bull theres no need to toss a 305 when u can make it run like a raped ape an steroids with a little elbow grease