305 to 327?

[Pvt. Maggot]

Yeah, just trying to build another motor to have, just for ****s and giggles basically, I might just throw a cam in it or something, it already seems to have flat top pistons. I'm basically focusing on my 383 super charged, but always room for more fun hah

I did hear that using vortec heads on a 305 wakes them up, and makes almost double the stock hp, Not to positive on that but i'm sure it does help alot. We will see what money allows while the 383 is being built, wonder what a turbo'd 305 would do

 

[blazin_blazer]

all you need is 350 block and pistons, all your other 305 stuff is same, put 350 pistons on your rod and put 305 everything into said block...v'iola' a 350 and your 305 heads will bump your compression up, i have seen people use 305 heads just for the smaller chamber and bump in compression w/stock 350 pistons!

 

[blazin_blazer]

now i'm interested in this supercharged 383....more specs? what kind of supercharger,pistons,cam, and heads?

 

[Pvt. Maggot]

I'm in teardown on the 350 right now, gotta take it to the machine shop and get it checked and cleaned, I didn't even check to see if its 4 bolt main's yet, if its not i'll sell it and buy one that is since I got it for free. I'll let you know some specs asap!

So the idea of a turbo on a 305 kinda peaked my brain activity, how do you think one would preform in a s10 or something small? Not looking to build the fastest thing in the world, I just simply like building stuff, thats a little different. I'm putting my old 305 out of my blazer into my 2wd Astro van, always wanted a v8 s10, and a v8 turbo s10 just sounds better hah

 

[blazin_blazer]

they claim 2bolt mains are good to 800-1000hp, unless your going over that i wouldn't worry, i've also been told some 2 bolts are stronger than certain 4 bolt mains, b/c the 4th/outer main threaded hole removes material from that web wall in the block and weakens the 4 bolt block...

since your just starting tear-down...if it is 2 bolt block, instead of searching for a 4 bolt block...buy aftermarket 4 bolt splayed caps and have your shop install them, drill/tap splayed hole, then align hone it, uber strong, stronger than factory 4 bolts, ask your shop they will tell ya, if they don't tell ya 2 bolt is plenty strong, but i like overkill, so splay my 2bolt blocks, like i said stronger than standard 4 bolt block!

 

[Pvt. Maggot]

Thanks for that info, i'll look into that! I don't think i'll be over 800 hp, I wish, but I just don't think a 383 with a supercharger will be that much, the only thing is this 383 will either go into a K5, which I need to find another frame, or i've been really looking for a 68-72 Nova, but either way its home will be a badass one.

Anyone have anything to say about a single or twin turbo 305?

 

[Pvt. Maggot]

Bump

 

[Cowboy_80]

305's are crap motors for what Chevy said they would be. That being said, a motor is a motor is a motor. You can make anything trick. Depends on how much $$ you have. If you're just wanting a spare block, build it as a 305. I personally despise the motor, but I also prefer a 327 over a 350, so my opinion doesn't count for much anyway.

As far as turbos go, go for it. Just keep in mind what your application is going to be. Turbos like RPM's. Along with the boost in power you'll get, you'll also get a boost in engine wear. I have nothing against turbos and would love to have one in my dd, but it would be useless in my Blazer. If you go with more than one turbo, don't go twin, go dual. One with big gates, one with small gates. It will give you more consistent boost through the RPM's. Same idea as what the new Power Strokes have, if you want to look up references.

 

[4by4bygod]

331 CID comes to mind for some reason.

a 331 is a 327 bored thirty over..got one in the camaro.. having used ARP studs throughout ( two bolt block) I can rev the snot out of it.. not sure if or how a 305 can be made to displace 331..nothing else to add to the thead, so I'll shut up now..

 

[89yimmiJ]

Personally, there isn't any parts I would save off of a 305 other than the sheetmetal.
A lot of them came with 58cc heads.
The cranks are the same strokes and casting numbers as 350 but you can't interchange as they are lightened to offset the small pistons.
The bore is so small that they don't react well with larger heads in comparison to a 350.
Performance pistons are expensive compared to a 350.

Unless you are limited to a 305 in some type of class of racing, junk it. You can find 350's all day long at junk yards for $50.

You could save $50 alone on the cost of pistons to offset the core purchase.

 

[pauly383]

350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC, 5.74" rod)

Thas not a small block Chevy per se , its a joint venture with Mercury Marine , it was a fancy futuristic motor when it debuted , at least compared to a traditional pushrod TPI vette motor .

 

[pauly383]

So if you were to build this motor, what exactly would you do? 305 ported heads? vortec heads? 350 heads? Lets rack the brains shall we?

If I was wanting to keep the numbers matching block in a SS Monte , Hurst Cutlass , or Ponitiac 2+2 . I would :

World Products heads for the 305 or Vortec heads , Eagle or Scat crank with Speed Pro slugs , factory color painted Edelbrock intake , Edelbrock headers , built Quadrajet , stall converter and 3.55 geared posi .

Probably get 13's from a G-body with good tires and the traction kit for the upper a-arm ears in the rear .

I really don't see a 305 ever being built by me otherwise , I just advocate using what you got until you can get better , which is why my 305 is still installed in the Blazer ( I have a motor in the garage for it , but the 305 is gonna go 200,000 miles first )

 

[vortec]

Quote:
Originally Posted by blazin_blazer
350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC, 5.74" rod)

Thas not a small block Chevy per se , its a joint venture with Mercury Marine , it was a fancy futuristic motor when it debuted , at least compared to a traditional pushrod TPI vette motor .

the LT5 was just a freakish science experiment. a very cool one, but in the end the townspeople hunted it down with pitchforks and torches. wait, that's not right. but in any case, it's not a true part of the normal SBC family.


in your place, i think i'd leave the guts alone (to save money), and start modding what's already there. P&P the intake, exhaust and heads. after that, you could play around with a roller cam/lifters and maybe 1.6:1 ratio rockers. notice i'm mostly talking about things that can be swapped onto pretty much any gen I SBC in case you decide to do that down the road. investing in the rotating assemble of a 305 doesn't seem wise to me when there are so many interchaneable ways to play.

 

[dyeager535]

If I was wanting to keep the numbers matching block in a SS Monte , Hurst Cutlass , or Ponitiac 2+2 . I would :

World Products heads for the 305 or Vortec heads

Of course, you'd never advocate defacing a Hurst/Olds or 442 by replacing the all powerful Olds 307 with the supremely inferior Chevy 305 would you?

LOL, just had to get the Olds correction in there.

 

[blazin_blazer]

been done

The cranks are the same strokes and casting numbers as 350 but you can't interchange as they are lightened to offset the small pistons.

i've used a 350 block, p.a.w. trw cast specials(350 piston), and used 305 everything heads,crank,rods,edelbroc performer rpm cam/intake, hedman headers,and it ran beautiful...best motor that been in my old '82 ever....went from a dog..to fun to drive!

edit: i had rotating assem. balanced...place that balanced it used my harmonic and flywheel, and balanced all of it...i balanced anly 1 other engine, and they did just crank,rods, pistons.???maybe you have to rebalance b4 305 stuff work in 350