I'm currently thinking of rebuilding my 305 TBi to be some what of a monster by adding direct port nitrous. But I also want to add some zz4 heads with a cam that will push alot of power to my 305. What type of pistons and cam would anybody recommend to handle around 200-300 shot of n2O? Thanks in advance.

 

If you are willing to spend that kind of $ and you really want to make some power then first and foremost ditch the 305 and atleast start with a 350 if not an LS platform.

 

IN on this one.

 

Me too, another "build my 305" thread. Somehow this never gets old.

 

She's real fine my ̶4̶0̶9̶ 305
She's real fine my ̶4̶0̶9̶ 305
My ̶4̶0̶9̶ 305

Well I saved my pennies and I saved my dimes
(Giddy up giddy up ̶4̶0̶9̶) 305
For I knew there would be a time
(Giddy up giddy up ̶4̶0̶9̶) 305
When I would buy a brand new ̶4̶0̶9̶ 305
Giddy up giddy up giddy up ̶4̶0̶9̶ 305

 

How is it even possible that here we are in the year 2020, and people are still thinking they can make a 305 into a "monster"? It's like poor decision making 101, like wife-ing a stripper, or trying to survive on pay-day advance loans, etc. You would think that with the power of the internet at the average American's fingertips, people would know better than to even ask how to build up a 305.

 

Does anyone have a link to the Freiburger video where he throws a stupid amount of nitrous to a 305 to see how much it can take before it blows?

 

Seems like a lot of the Motortrend Youtube content went offline when they started their subscription service. Not sure the 305 project bought it as part of that switch or not. Like most of those videos didn't they cap the episode by saying the results weren't exactly applicable to practical usage? Might be viable for drag racing, but little else. #1 issue with nitrous is the economy, or lack there-of. Even a relatively mild jetting will run a 10lb cylinder empty in a few pulls.

 

https://www.hotrod.com/articles/engi...-305-take-nos/

 

That little 305 on the video is making about 400 horse power without the nitrous. With a 150 shot they got it to about 560 horse power. That's good enough for me and my original 305 Tbi Fellas.

 

Well Thanks for the info🤔 question to the group really was what cam and pistons should I throw in this monster I'm trying to build thanks in advance.

 

Because there's no difference at all between a 305 short block with heads, cam, intake, and 850cfm 4bbl carb, and a stock TBI 305... Right? Also no problem fitting dyno headers in a thirdgen chassis, no issues pairing the cam they used with EFI, or substituting a stock TBI for a 850cfm Holley. Surely that engine that had to do nothing more than drive the engine dyno is going to have no problem at all when it's bolted to a stock 700R4 and put in a car. I'm sure it'll have perfectly civilized street manners.

Did you watch the video? They said to open the ring gaps. Forged pistons probably wouldn't be a bad idea, but by the time you buy forged pistons for a 305 and go about prepping the block, you'd be well into the same dollars as just buying a 350. But hey, the best way to learn is by doing. Go ahead and build the Engine Master's 305 and put TBI on it and throw it in a thirdgen. Be sure to document the process so everyone can follow in your footsteps or just point and laugh at your folly. Either way it's a win-win.

 

Yea my 700r4 is nothing close to stock. That thing is build for some seriouse power. Plus I'm planning on hooking a Holley 1000 cfm TBi on the intake. All forged rotation internals. Like I said I'm bringing the monster outta this 305. This is no cheap built. I just want to keep the car with its original block instead of doing a junkyard ls swap.

 

Sounds like you will have a monster on your hands with that build.

 

If you are going that far, you should upgrade to the Dart 305 block.
I see you are in California. Do you plan to pass emissions also?

 

Thats a nice block. I believe the only difference is the 4bolt main rite? But either way I'm trying. To keep the car with its factory born block. As far as emissions im making it smogg excempt. Hopefully it. Works out. If not then I imma have to find a dude that will pass the smogg for me there's plenty of them here.

 

Its worth so much more with that factory born block being its a top of the line drivetrain and being a RS makes it even more desirable man id leave it stock

 

Seems like a lot of work just to get outrun by a stock Camaro or Mustang.

 

Yea I don't think I'll. Be getting gaped by no pony. Boys lol

 

[QUOTE=ShiftkitoNeM;6358886]Yea I don't think I'll. Be getting gaped by no pony. Boys lol[. Not even a stock ls. Probably. An. Ls7

 

This sounds like a huge waste of money. For what your gonna spend you can easily slam an LS1 in there with a cam/spring kit with your nitrous and make a hell of a lot more power more reliably with modern parts. If you insist on using yesteryears stuff build a big inch SBC and make the power you want on motor alone

 

at this point i think i would rather see the direct port 305 than another run of the mill ls swap.

 

Lol. Sure it would be a fun day until it exploded everywhere

 

This build will never happen. Send it to the trash pile of other built 305 threads.

 

If you had a bunch of stuff lying around to do this, sure. If you don't have a bunch of stuff lying around meh. They do make 305 good pistons and the rods are the same as 350 rods but my opinion would be just get an intake, direct port the 305 and slide a different, larger bore long block under there when you're done. Build a good fuel system and throw E85 at it which should help keep it alive. Throw a full exhaust and 1-3/4 headers on it so you're ready for the new setup.

 

I would love to see a "do anything you want to a 305 and see who goes fastest" class.

 

People would swap in 350s.

 

I posted a 305 that made 612 hp on 10 psi. Thats pretty decent for stock shortblock

i would not do direct port unless you just want to spend money OR plan to go bigger built engine in the future and swap intake over.

Ditch tbi intake and get an efi single plane or other type of individual runner intake like maybe a stealth ram or proflo xt

if you want to spray 200-300 on a 305 this thing is gonna need work. May want to consider a copper type head gasket in case during tuning it eats itself, gasket will let go and may save alot of damage vs an mls tyle gasket. Either way it will hurt itself if tune is off. Might want a cam thats more designated to nitrous use

may want the heads chamber softened a bit and do work on the exhaust side port. Will need good valves to handle the heat, wider valve job cut

pistons, forged JE flat tops or equal would be ok. Or go custom. Get a thick wall pin. Wide gap rings, etc.

forged crank and rod is a must imo. Splayed 4 bolt main cap conversion. Might be warranted.

then again maybe all this is for not lol 300-325 hp 305 with stock zz4 heads is realistic and even. 300 shot is 625 hp ish. Thats not asking alot on a sbc block