Hello,

I am in the process of rebuilding my 305 cu. engine. I want to change it to a carbureted engine and lose the TBI. I'm thinking of a 650 cfm carb , edelbrock victor jr. intake, sportsman heads, a big cam, forged pistons, and a longer stroke on the crankshaft. Will the 335 stroker kit from powerhouse have a benefit on my project? I was inspired by the 302 cu. engine that chevy did on the 98 or higher z28 that pumped some 400 horses. I know that the 305 that i have in mind might not even touch 380 hp, but i was wondering if my idea was possible. I want to rebuild the 305 with top of the line racing parts. If anyone has any ideas or suggestions, please feel free to do so.

P.S. Chevy's rock

 

Well it's possible to make big power from a 305, I had the idea once, but why would you want to? 350's are cheaper and there's more potential. (especially with the stroker kit) Also, "top of the line" race parts, are more than likely out of your price range, and wouldn't work well on the street. What are you wanting, just 380 HP? Not a problem. Call Summit, get a stroker kit from them with forged pistons, new rods, and crank. Find a good flowing head, that's matched well with a cam, and then probably a 750 cfm. carb. Contact some engine shops in your area, get power ideas from them. Balancing is ALWAYS a good thing, especially since with forged pistons you can add a blower of supercharger!!! I just got my motor back and I had the heads ported, a dry-lube process done on the heads, crank, pistons, and rods. (That decreases friction by 66% and INCREASES HP by 6%, not to mention it increases the longevity of your motor....) I also had the heads heat-treated, they are now 260% more resistant to absorbing heat, which lets them heat up the combstion chamber more by as much as 200 degrees therefore giving a better burn, and you guessed it, more power! Of course these things add up $$$, but in my opinion they're all worth it. (Especially the dry-lube and balancing). If you want to add a blower or supercharger for easy, always on, power, make sure the compression in NO higher than 9.25:1 and it's balanced. Nitrous is also a cheap easy way to make BIG HP.... There's a start for you. Again, my biggest recomendation is go talk to engine shops, even if you plan on doing most of the work yourself.
John

 

John,

Are your ideas applying to the 305 block? Can I use a regular blower for the 305? What about a NOS Fogger?

Thanx,
lanyabuddy

 

i'd forget the edlecrap stuff, buy SR or vortec heads, port them, run smallest chanbers i could and dished pistons and shoot for 9.5 compression. i'd do some research into cams. if you have a auto buy a vig or yank converter and more gear. plus you need to be able to apply it so look at SFCs and LCA relocation brackets.

 

First off, what "edlecrap"? Edelbrock and Holley just depends on the person, I personally like Edelbrock, but others prefer Holley. Fine, but WHO really cares? It' s personal thing with no STRONG evidence either way....
Next YES you can get a small block blower/supercharger from Summit for around 2g. It 's costly but DARN that would look cool and HAAAAUUULLLLL...
John

 

John,

At what rpm do u think the 305 will be able to produce around 380 hp? Can I bump up the torque to about 400 lbs.

I appreciate the suggestions.


Lanyabuddy

 

What about driveability ? dude , I had a 305 before, wanted to do the same thing... look at it this way .... 380 hp is alot from that little bugger.


As your question you would probably make that hp at 4800 rpms or near that. all depends of the intake you're using.


building the motor you're talking about is near 4000$ if not more and that's without supercharger. think about labor also.

Why not get a new ZZ4, good intake and headers, you'll make more power for less money. if you think about supercharging a beast like that, you're in some serious horsepower.

Anyway i'm not saying your idea is bad but in the end I think that if you go a head with such a buildup you'll be dissapointed with results and will most likely have parts breaking down often.

My 2 cents.

 

For my crankshaft, I was wondering what stroke length would be best for better horsepower and torque. I was looking at the Holley rebuilds for 300-400 cu. engines. They have different size strokes for the crankshaft. What size will be the best for a racey 305 engine? Also, what about the powerhouse rebuild kit and what is the length of the stroke on the crankshaft?


Thanx

 

Bully you into getting the 350. Do what you want with the 305, keep your car numbers matching, and have fun with it. I honestly don't care if I am spending more money on my 305 than I would on a 350. We're talking pennies here. Consider my build up and than do a search and see all the 350 guys that are spending the money on the same exact parts... and than realize I can switch up to the 350 if I want to, but my car will stay numbers matching.

Here's the base of my build up:

1) Having the block Blueprinted, aligned, honed, squared, hot Tanked, and magnafluxed. (Just about everything you can do)

2) Bore and hone .30 over

3) 335 stroker kit

4) Superram intake - Check all the 350 guys switching over.
Jegs - Superram

5) Vortech Supercharger
Vortech Supercharger

6) AFR 190cc Heads
AFR

7) SLP headers

8) Cam - Not sure on this yet, as it needs to be set with the completed setup.

Custom Exhaust, Roller rockers, Complete forged bottom end, the above still maybe changed around a bit, but you get the idea. 305's don't make power? Check the above and tell me that...

And Most of it can be changed over to a 350 if I so choose at a later date, so I am not wasting money as many on this board would like you to believe, because it is a long term investment towards any SBC I want to drop in. *** bless the Small Block Chevy.

You can also ask chevy if the 305 is a waste when they dropped a 305 in the corvette in 1980. Only lasted one year, but it shows that chevy didn't feel the same way as some on this board.

Good Luck,

James

 

Why did Chevy bother with 305's in the thirdgens for a couple of years? I guess they liked the engine!!! Anyways, thanx for giving me a buildup sheet for the 305 and how much horsepower do u think that will produce.

 

Honestly I couldn't give you exact numbers because no one has done it and I will need to get it dyno'd. My best guesstimate would be based on what I wrote all working togethor. Going by manufacturer suggested output (which should be higher with everything working together) as well as a HUGE ballpark guess:

Cam
Headers
Full exhaust
Superram - changing from TBI so BIG difference
AFR 190cc Heads
All forged bottom end
Supercharger
Roller rockers
Stoker kit
Cost - A whole lot! The superram and supercharger is combined around 6k alone hehehehe

Expecting 500+ flywheel
(My actual calc, based upon the manufacturer's again, is much higher, but I am being realistic here)

Im also litening up the rotating mass, carbon fibre driveshaft, etc... so that I do not lose a full 20% at the wheels. All in a convertible :-) That's good stuff...

Good luck

 

Do u know the stroke length of that 335 stroker kit from powerhouse? Also, do u think i should bump up the compression on the 305 to like 10.1. I think that would be another good horsepower and torque gain...

 

Dude, this is coming from a guy currently and firmly in the 305 camp:

Give it up. 380 HP out of a 305 is an unstreetable combination (and you won't get 400 ft-lbs from it). Even out of a stroker.

Get a builder 350 block and have some fun. You'll save yourself a lot of money, you'll make more power, it'll have more torque, fuel economy will be the same, you'll have more options for the build; and if you go 383 (for less money than a 335 will cost you), all of these goals will be a walk in the park to obtain.

Give up the 305 idea. You can't change the laws of physics by dreaming.

Oh, the Powerhouse stroker kit uses a 400 crank, just like all those 383's out there. 3.75" stroke.

 

Obtaining 380hp out of a 305 is a stretch. You're gonna drive it daily right? A larger displacement engine will put out more power and remain very streetable. If you're stuck on the small displacement idea, then at least get something with a larger bore.

 

That, or dont bother with stroking it (which I think is a wasted effort) but go ahead and get a supercharger on there instead. You have to get the air in those small ports and bores somehow, may as well cram it in there. Works quite well if its done right.

 

Where can I find a 350 short block for under $500.

 

around here you can pick up a complete 350 for 100 to 200 dollars, blocks for 50.

 

I picked up a complete 350 delivered to my house for $100 canadian. Also got a 283 with 4 speed for $100 canadian. Engines are so cheap these days, especially abundant 350's.

 

moderator,
where do find that $50 block?

Lanyabuddy

 

they're everywhere, look around. i've got 4 in my shed plus a 283 block and a couple of complete engines. lot of machine shops have parts for sale for the labor bill aftersomeone gets the work done and can't or won't pay.

 

Anyone wanna sell there 350 block for 100 dollars or less? Also,
a 427 block would be nice?

 

lanyabuddy what's stopping ya from whipping out your yellow pages and calling around to local junkyards? You waiting for someone to do it for you and post it here?

 

Does anyone know how I can get discounts for a new GM crate engine? Do I have to join a club or something...I'm just wondering... Also, have u guys bought 350 blocks from the classifieds on this thirdgen site and did they arrive in good condition..

 

Here I come whith my dammn tech articles!
http://www.angelfire.com/nb/thirdgen/343hp305.html
and http://www.goingfaster.com/spo/325_h...chevrolet.html ohh and this is the same but whith less detail, http://www.goingfaster.com/spo/carcraft325hp305.html .

Happy?