wanab03ss

iTrader: (20)

i was told today that a 327 is basically a 305 with a different crank . anyone know if this is true.

89RsPower!

no a 327 has a 4 inch bore.

discostu

A 305 has a 3.74" bore and 3.48" stroke.
A 327 has a 4" bore and 3.25" stroke.
A 327 is more like a 350 then a 305.

He might be talking about a stroked 305 (3.75" stroke), which comes out to 329 without boring the block.

Bandit5

Purely out of curiosity, can you (and has anyone) bored a 305 to .26 over and put in a 327 crank?

I am about to rebuild an old 305 and am toying around with a few different ideas including stroking... but I never thought about de-stroking before.

InfernalVortex

iTrader: (4)

Destroking is mostly pointless.

When you bore out a block, you bore it out .010, .020, .030, .040, or .060. You wont find .026 oversized pistons anywhere. I dont know where you got that number from?

You should look into building a 350 core instead of rebuilding the 305. If the motor is going to come out of the car, get machined, and get new parts, it's pointless to not use a 350 block. New parts and machinework cost the same regardless of how big the block's bore is. Might as well make the most of your money and spend the pocket change required to get a 350 core.

Bandit5

I am doing this on an old 305 I have left over. Swapped in a 350 a few years ago. I figured I can do something with it.

I guess I will either keep it stock stroke for go for the 355 stroker kit.

Vader

Since you can frequently find rebuildable 350 cases for free, that doesn't make economic sense. You can purchase a running 350 in many places for less than $300. Sell the 305 to someone who really wants one (or thinks they do) and acquire a rebuildable 4" bore block. Then stroke/bore/whatever to whatever degree you wish. A 350 on the highway will get the same fuel mileage as a 305, if properly tuned and geared. The 305 might eek out a MPG more in city driving. The durability is the same, so the rest is a wash. Many 350 parts are actually cheaper than 305 specific parts, such as pistons, ring sets, and balanced rotating assemblies.

89RsPower!

also there's no way to stroke a 305 to a 355...

AlkyIROC

A 305 bored .030 with a stroker crank makes a 334. Still a tiny bore for HP but more torque.

Apeiron

+.020" bore, 4" stroke

Best of luck to anyone that actually wants to do it, though.

RebornFromAshes

I believe one of the questions was about overboring a 305 by 0.260", not 0.026". If you bore a 305 over by .26" you would probably be able to punch your finger through the thinnest parts of the cylinder walls. You simply can't take a 305 block out to the 327/350 stock bore. Even on old thick-walled 427/454 blocks an 0.125" overbore was about the maximum.

Provided that one could overbore a 305 to a 4" bore, why bother? It would make more sense to find a factory 350 block than to run a 305 with super-thin cylinder walls.

Bandit5

I am sure someone would have figured out that I meant the 335 stroker kit.

The reason I am rebuilding the 305 is because I have it sitting here, and I want to learn more about engines. So rebuilding it, something that no one cares if it just blows up, will be a nice little project. Plus, I think I can get some decent power of it and put it in a junkyard car... or at least a car that needs a working SBC.

five7kid

iTrader: (14)

It's not good to assume anything, especially when the number stated is another familiar configuration.

Building the 305 isn't a bad way to learn, it's just not the most efficient use of money for performance results. If something just needs a working SBC, it'll do just as well with a 305, and you'll have learned pretty much as much from rebuilding the 305 as you would from a 334. And, for a lot less money.

On the other hand, if it's experience you want and you want something marketable afterwards, find a $50 350 core and rebuild it. You might actually recoup your expenses that way.

Of course, none of this has anything to do with the original topic of this thread.

Sonix

iTrader: (1)

You could sleeve your 305 block to get the 350 bore! ahh now i'm just fueling the flames of bad choices here.
If you were going to sleeve a factory 305 block (with more than... 1 sleeve), then you really gotta give your head a shake.

DLV555

iTrader: (1)

I don't know where you guys are looking, and maybe I've just never lived in an area that has a good market for cores, but I have NEVER seen ANYONE selling a 350 core for $50, or anywhere near that. I see regularly $300 for a core, $500 or more (as much $1400) for one that runs. These prices do not make it economical for some of us to purchase 350 blocks. If I could find a 350 block locally for that cheap, you bet your *** I'd have one in my garage. In the meantime I will build my 305s since I have 3 of them, one that I got for absolutely nothing. Not even a handshake.

On the subject of sleeving them. A buddy told me he did that once, is that seriously feasible? I didn't believe him.

Zepher

iTrader: (1)

I bought 2 350's in the past, one for $75 a few years ago and one 2 months ago for $100. the one I just bought is at the machine shop getting bored and cleaned and will eventually end up in my Formula.

Apeiron

Wouldn't be enough metal left after boring to support a sleeve.

Sonix

iTrader: (1)

Sure you can sleeve a block Just look at the prices though. Lets say it costs $50 per sleeve, and $100 labor to install it. Now put in 8. $1200 for a sleeved 305 block You can pretty much buy a new aftermarket block for that. And that's just a guess, i'd think it costs even more.

Do you have pick a part junkyards near you? It's $143 for a complete engine. If you mix and match parts and walk through the tills with an "engine" (partially disassembled, since everyone does that to check the bore condition) you can get a 350 from a 1992 truck, heads off a 1986 camaro, intake from the camaro, etc etc. End up with a roller 350 with 416 heads for $150.

But you're right, local classifieds near me sell running 350's for ~$400 or more. But the block? Maybe cheaper from a machine shop, etc.
My brother got (what is now my) running 350 block as a straight across trade for a 1976 Buick Lesabre that was purchased for $700. I paid my brother $200 for the engine

Apeiron

They're around, you just need to figure out who you need to talk to in your area. Even at $300 for a 350 block to build a 383, that's not really all that much more money to spend on top of the rest of your parts to get an extra 25% more displacement.
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More like $50/sleeve, installed.

a/fool

3.8 bore + 3.85 stroke = 349.31

Sonix

iTrader: (1)

Well then, if it only costs $50 per sleeve, what's the problem? I heard it was über expensive to sleeve a block, such that 3 sleeves needed made it scrap. I paid $180 to bore my block, and $120 to deck it. $50 a sleeve is a bargain, you could resleeve a block for $400!

Alright, sleeving a 305 block to make 350 cubes isn't all that feasible, I was just throwing the idea out there.

Apeiron

It doesn't take many $50 sleeves to exceed the cost of a $50 block. Unless you've got a lot of monetary or emotional investment tied up in the block, it's not usually worth it.

wanab03ss

iTrader: (20)

Holy crap i just asked if a 305 was a destroked 327? no its not. thank you. I love how the forms get there own life, its always fun to watch. but seriously thanks for all the info.

Sonix

iTrader: (1)

haha, it's great how it goes eh? You found one of the hot topic keywords on TGO.
stroking a 305, anything about a hot 327, or 327 lore, alternate fuels, electric superchargers etc will bring out the masses for discussion.

You always get your moneys worth on here for opinions.

Bandit5

Should I tune my 305 to run E85?