Steven_500

A 350 bored 30 over, does that make it a 355?

Thanks

ede

it's still a 350 with a +.030 overbore

ljnowell

The new cubic inch displacement of the engine is 355. The engine is a 350. It is what the casting says it is. The only time it differs is when you change the stroke.

Randel '86

Is there really a rule? I mean are the displacement police gonna knock down your door at 3 am? Everyone knows what a 355 is, I don't see the problem is calling it that.

edit: clicked edit instead of reply

nsimmons

i got a 353, am i some kind of freak?

ede

355 is what people that don't know any better call a 350 that's had some maintance work done to it. the odd ball displacements should be left to something that's had the stroke changed, not the bore size.

ljnowell

Thank you ede. Finally someone else who has been around long enough to know that saying something like "355" makes you look stupid.

Randel '86

yea I suppose people could start using there combustion chamber volumes, piston dishes/domes and really get crazy.

ljnowell

Everytime I see this thread title, all I can think of is a 350 in the corner of a garage humming and tapping its toes, as it twiddles its fingers.

ME Leigh

People use it to signify a rebuilt 350, thats all. It's just a easy simple way to say that its been rebuilt.

SMS 1

Guess I am stupid then cuz I don't really see what the problem is. It's a whole lot easier than saying "It's a .030over 350 or just simply a rebuilt 350" I think that sounds even worse. WTF I mean if the actuall displacement has changed to 355 why not? If I had a dollar for every time I have heard an SB400 called a 406 I wouldn't need a day job. Case in point . . .

Just my $.02

ede

you may be right. look at it this way it's pretty easy to make a 327 with an over bore equall the displacement of a 305 wit ha stroker crank. both could be the same CID but very differant engines. no matter what the original poster does it'll always be a 350 with an over bore.

Steven_500

Well i just seen a Vehicle for sale that was .30 over. I don't know to much about engines yet and was just wondering.

five7kid

iTrader: (14)

I hope it was bored .030" over, not .30" over.

Randel '86

your scarying me

Randel '86

Some numbers just sound good, others don't. 355 and 388 are just about the only good sounding numbers for overbore. 406, 461, 414, 383, i dunno what it is, but do those numbers bug you guys to? I cringle when I hear them.

ljnowell

I just hate when a punk kid tells me he has 357 with double hump heads, and NOS. You think its hard explaining the overbore thing, try teaching 16 yr olds that NOS is a name brand not a power adder.

five7kid

iTrader: (14)

I've known some "boring" 350's - like my brother's '68 Buick...

Some Chevy over-sizes that "bother" me:

331.

292 (sounds like a straight six).

310.

440.

401.

I don't see the problem with calling your engine what it currently displaces. However, I don't call my 396 a "401" - doesn't sound like a Chevy. Come to think of it, Chevy didn't call their non-bored 4.125" x 3.76" a "402" - it somehow was either a "396" or a "400".

A 383 is typically a 4.030" x 3.75" - the block is overbored to get there. The Chevy crate 383, however, is a 4.000" x 3.80" (do that math) - which is right? A 4.000" x 3.75" is a 377 - but if you say that, people think you have a 4.155" x 3.48".

Here's what I think is the bottom line: "355" takes fewer bytes to say than ".030-over 350".

SMS 1

I understand you perfectly fine. I understand that an SB400 crank machined to fit a 350 makes (overbored) 383ci but yes it is still a 350 block. I understand that conversely a 350 crank in a SB400 makes 377ci but it is still a 400 block. I just see it as slang like many words in our language (calling a .030 over 350 a 355 and likewise 383, 377, 406 ect.)

I'm just going to build something huge and when someone asks what it is I'll tell them "Well the vin# corresponds to a 5.0L so I guess thats what it is"

SMS 1

I should have said that! BTW: Engine size of 283 gives me the creeps.

ljnowell

not the vin, the casting on the block. it is what it is.

SMS 1

OK fine. Didn't get the sarcasm, again, whatever. So how would you classify Bow-Tie blocks then? Aren't the casting numbers on them representative of a bore "range" rather than a specific displacement? How would you tackle that one?

SMS 1

OK wait a minute, if you change the stroke you are changing the displacement NOT THE CASTING number. This is the reason you are giving us that overboring does not make the enigne different because the casting number will still say it is a 350. Why does it then become a different size engine if you change the stroke but not if you only overbore it?

Q: Does changing the stroke somehow also change the casting number?

A: No, it does not.



OK, before I get kicked off this site I will say sorry for getting all excited and put on my flame suit. It's been a long day and I have had a little to much caffine trying to stay awake I think.

ME Leigh

It doesn't matter some people want to know the engine size running in the car, others want to know what block it is.

The only time it really matter matters are in racing rules where a specific engine size or maximum has to be used.

Some people and just tards or ****** and can't get over themselves.

How really cares?

five7kid

iTrader: (14)

Some occasions when it matters:

- NHRA stock class. Those tear-downs are murder...

- NASCAR. Never mind, too much red in my blood.


To me, "355" is more to the point. Saves breath. Same with 406.

Most anything else requires explaination.

AJ_92RS

Chicken or the egg?

Taste great. Less filling.

Kleenex or "facial tissue".

Sportscar. Roadster.

Actual displacement. Engine block w/ overbore.

Does it really matter?

ede

sure it does

ME Leigh

Well crap i guess you can't really call a 350 block a 350 now can you considering it is really 349.84775789376 CID.

five7kid

iTrader: (14)

Insignificant. So, 350 is fine.

Used to be when you said "396" or "427", you were talking about a big block.

Engine, or motor.

Zipper, or sliding fastener.

Velcro, or hook & loop.

You say tomato, the flash card says potatoe.

Former President Clinton, or her husband.

ljnowell

A 350 punched .030 still has the same stroke, therefore it is still a 350. When you punch it and stroke it, you are changine more than just the CI. YOu are changing the entire engine, ergo it is neccessary to distinguish it apart from others.

ME Leigh

So you are saying a 3.48" stroke defines a 350 engine?

OK :lala:

ljnowell

not it could be a 305 too. But if you take the heads off of an engine and it has a 4.00-4.060 bore, and a 3.48 stroke crank, it is a 350. end of story. YOu can call it what you want. Look stupid, its no big deal, its not my problem.

ljnowell

and yes, it pretty well does define the 350. a 350 stops being a 350 when you stroke the engine. I cant believe there are so many stupid *** people here

ME Leigh

You know what defines engine size, its displacement, or the bore and stroke, not the block thats holding it.

8Mike9

So I have this picture in my mind of a few guys sitting in the garage knocking a few back on a Saturday afternoon, arguing about this...after the first 12pack is gone, I have this vision of one the guys standing up a grabbing a 3lb hammer, and whacking the other guy over the head.

"There's your f'ing 355, wadda you say now?"

five7kid

iTrader: (14)

Unfortunately, I can see one of them going to the pickup and picking up something else.

Well, I think we've beaten this one to a pulp. When you clean up the cylinders of a 350 by increasing the bore diameter to 4.030", you increase the total displacement to 355 cubic inches (roughly).

What you want to call it...

Let's just call this one "done".