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Old 06-12-2004, 05:51 PM
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How to tell if engine is a 350 not a 305

Hey, I was wondering how you tell the diffence between a chevy 350 and a 305?
Thanks
Sam

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Old 06-12-2004, 06:29 PM
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block casting numbers on the back of the block where it bolts to the bellhousing of the trans. Also under the driver's side valve cover (down by the freeze plugs on the side of the block) it has the size and date of the casting.

A good indication is where you found it too. U could simply decode the vin of the car-

K
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Old 06-12-2004, 07:56 PM
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Later model blocks also have cast in to the bellhousing horn the numerals 5.7.

Vince
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Old 06-12-2004, 10:21 PM
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This is just from what I have seen on chevy's, but dont 350s and 305 have totaly different valve covers? The 305s have those groves in them. I might be wrong here.
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Old 06-12-2004, 11:08 PM
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drive it, you'll know. j/k
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Old 06-13-2004, 06:36 PM
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305 or 350?

Quote:
Originally posted by 87442lover
This is just from what I have seen on chevy's, but dont 350s and 305 have totaly different valve covers? The 305s have those groves in them. I might be wrong here.
=============================================

Doc Here

Nope...My 80 Vette Has A Ca. 305 in it... no flags .

The only way to be sure is check the casting numbers.

Or Drive it...If It's a 350....when you stab it...

It will Growl...

If It's a 305 .....

It will bark.....

Doc

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Old 06-13-2004, 09:22 PM
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my 305 has the numbers 305 cast in the side of the block.
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Old 06-15-2004, 03:38 PM
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Check the casting numbers on the back of the block on the driver's side. Go to www.mortec.com and run the numbers and it will tell you what it is.
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Old 06-15-2004, 03:46 PM
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no 442...there externally pretty much the same. 84 or so & newer well have 5.0 or 5.7 cast onto the block by the bellhousing. Ive never seen a 305 with "305" cast in the block, thats a new one by me. Ofcourse you can always check the casting # if nothin else
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Old 06-15-2004, 05:04 PM
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Nice GTO jet...You beat me to it...
When I read the thread subject I thought "Put it in gear and hit the gas.....then you'll know.....".
Although my buddy built up a pretty good 305 for his Regal.
He beat me 2 out of 3 in my stock 79 Z-28...
I think I could have beat him if I had enough traction....
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Old 06-15-2004, 05:28 PM
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Casting numbers

Doc Here

5.0 is the 305 ....
5.7 is the 350... stammped , If I remember by the bellhousing.

Doc

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Old 06-16-2004, 12:26 PM
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Doc...
Good aviation quips... haha

Another:

"The only time you have too much fuel is when you're on fire."
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Old 06-16-2004, 01:31 PM
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Old 06-16-2004, 04:19 PM
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Gen3 I have relatives by you
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Old 06-16-2004, 05:07 PM
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305

Doc here

General Mystery (AKA: GM) Where We Strive For Confusion and non~Consistancy....

I have been all over the block in my 80 vette, never found a stamp that said "305" but one that said 5.0 ... shows to go ya... The Engineers Do support, and own Stock in the Prozac society of America...

A Little History:
1980 Corvette
305 California
#43 of 50

1980 was the year they moved the Corvette Division to Bowling Green, and were not Tooled for California Smog .... In order to meet Demands, They took limited orders for California (under 50 I believe) and offered 3 flavors of engine Packages (The only year they ever did such a thing) The Engineering Department Ordered "Crate 305's " From Detroit and re~engineered for Corvette, (Akin to putting a smaller mainspring in a watch...and telling the Public,"It's All Good") Already Built for California Smog Standards.

I Have worked on SEVERAL of these (unmodified) Corvettes, and NO two are the same... No matter what the Manual Say's ... Take that Only as a CLUE and start looking elsewhere...

For Instance:

I recently (2 months ago) Had to Re~Cert under California's New Smog Check 2 For the first time (This is done on a Dyno, and has the toughest Emission standards in the Country) The Car Failed Miserably as expected, in fact was a Gross Polluter, (meaning it now could only be tested By the State Referee)

After reading up on it, I went to repair The Smog system in Total, Since it's a resto project anyway, I just began throwing in New parts, New Cats, New Sensors, New Hoses, Ect..Ect..

Referee Check #2= "GP" with even HIGHER numbers, So I decided to start with the Confuser and associated crap.

Now here (yeah, like, right) is where it gets weird,
Books say,

A) No Computer,
B) Computer, but it doesn't store Codes,
C) Some Did, Some Didn't..

and the ever Popular D) Your Guess is as good as mine...

Books say, ALDL is always located under the ashtray, but may also be under the headlight door bypass ..

Books say, Computer is always located in the Center Console or Behind the Glovebox, ...

I removed the Interior Et&Al.. No Computer..No ALDL..Lojack is a thrill a minute though....

Hummmmm???

Books say, ... If you have a Vacuum Advance, You Have no Computer...

But If you have O2 Sensors .. You Do....

Hummmmm I have Both???WTF??

Bare in mind, this car is 1 owner, unmodified...

After, 13 ... Yes , 13 Trips to the State Emissions Referee (who didn't even know what computer program to test it under, started with L82 and worked down..) and $6100 in parts I really didn't want, or would make it go faster, and test costs..

BTW .. If you pay for the Pretest and the test in earnest...it's $200 a run....Or $89 per Try.

And BUILDING from scratch, a Smog System From all the best information I Could Gather, I was able to pass low emission Modified, acceptable System..

In 1981 Corvette Engineers Said : "Well, .... We Won't be doing that again...." Squeaked by another year..."

I am assuming although in 90% of the cases The "Word " is gospel, but what about that "Off" Day when a Machine breaks at the plant and just for that one day?? and they modify the program for some other Step to assume a duel role of placing or ID'ing parts...in a different location as an alternative to shutting the line down... I'm sure they happen...We Just never hear about them ... At least until that part Fails.....and we must now find and replace it... Which makes buying Sock in Prozac and lithium manufacturing Companies Such a Secure Investment.....

Doc
PS: Thanks, Ragmopp!


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