Difference Between 305 and 350 - LS1TECH

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Old 03-02-2010, 11:28 AM   #1
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Default Difference Between 305 and 350

Theres a 3rd Gen Firebird im looking at buying, the guy did some work on it at his shop and the owner of the car couldn't pay so he forfeited the title over to the shop. The only problem is i cant tell if its a 305 or a 350, the owner of the shop couldn't care less and just wants it gone.

Are there any easy things to look for to tell if its a 350 or a 305?

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Old 03-02-2010, 11:39 AM   #2
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There should be a sticker in the center console with that information on it - actually it contains about everything you want to know about the car if it's there. They are called RPO codes - do a search online for a decoder and you can find what just about all of them mean. For engines:

B2L - Corvette engine (in some 3rd Gen Irocs)
LG4 - 305
LB8 - 6 banger
L98 - 350
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Old 03-02-2010, 11:42 AM   #3
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quick way is the harmonic balancer or run the cast number
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Old 03-02-2010, 11:43 AM   #4
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Quote:
Originally Posted by FordGirlGoneBad View Post
There should be a sticker in the center console with that information on it - actually it contains about everything you want to know about the car if it's there. They are called RPO codes - do a search online for a decoder and you can find what just about all of them mean. For engines:

B2L - Corvette engine (in some 3rd Gen Irocs)
LG4 - 305
LB8 - 6 banger
L98 - 350
Thats the problem part of the work was they swapped the motor, and the shop is going out of business so he wont say much about the car, Ive been told they replaced the engine, so is there anything to look for specifically on the engine that could tell me.
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Old 03-02-2010, 11:52 AM   #5
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Look for cast numbers on the engine block.

Then search those numbers on the interweb.

This whole situation sends up a red flag to me. The guy trying to sell the car should be more then willing to tell you anything and everything you need to know to get it out the door. I'd check this thing over real well before I gave this guy any money.

Good luck,

~Jim~
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Old 03-02-2010, 12:00 PM   #6
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Ditto -- if they replaced the engine and they won't tell you what it is, but they want to get it out of the shop...I'd say let it pass. You have no idea what you might be getting yourself into both mechanically and legally.
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Old 03-02-2010, 12:09 PM   #7
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Originally Posted by BassProCamaro97 View Post
Look for cast numbers on the engine block.

Then search those numbers on the interweb.

This whole situation sends up a red flag to me. The guy trying to sell the car should be more then willing to tell you anything and everything you need to know to get it out the door. I'd check this thing over real well before I gave this guy any money.

Good luck,

~Jim~
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Originally Posted by FordGirlGoneBad View Post
Ditto -- if they replaced the engine and they won't tell you what it is, but they want to get it out of the shop...I'd say let it pass. You have no idea what you might be getting yourself into both mechanically and legally.

Yeah im going to go look at it tonight hopefully. Im gonna talk to the owner, I wouldn't buy it unless he has a clean title for the car. He only wants $500 for it.
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Old 03-02-2010, 12:30 PM   #8
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45 cubic inches


Try this on the engine #'s.

http://mortec.com/
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Old 03-02-2010, 01:13 PM   #9
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You'll need a small flashlight, a small mirror on an extendable rod, and a flexible neck

The numbers you need will be located on the back of the block, between the transmission bellhousing and the cylinder head. Of couse, that will only tell you what block it has, and not what the rest of the engine consists of.

If it's got a "new" engine and he only wants $500 for it, you're buying a nightmare!
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Old 03-02-2010, 05:06 PM   #10
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sounds like it has a junkyard motor and nobody cared to find out what is was before it came out of the doner car.
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Old 03-02-2010, 08:55 PM   #11
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Have you driven the car? Hows the body and everything? Hows it run? Regardless of whether it has the 305 or 350, if it runs good and looks good, $500 bucks is a good deal!!

..with that being said, something sounds very strange about the seller
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Old 03-02-2010, 09:26 PM   #12
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45 cubic inches maybe?
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Old 03-02-2010, 09:29 PM   #13
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305 is a boat anchor
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Old 03-02-2010, 09:55 PM   #14
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45 cubic inches maybe?
Your rank proceeds you, cambirdracing got it before you.
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Old 03-03-2010, 01:37 AM   #15
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Since they aren't willing to tell you I would bet its a 305. If it was a 350 they would say so.
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Old 03-03-2010, 01:58 AM   #16
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Since they aren't willing to tell you I would bet its a 305. If it was a 350 they would say so.
Agreed. I wouldn't want to tell you it has a 305 in it either. Boat anchor fosho.
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Old 03-03-2010, 02:30 AM   #17
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Either way it is worth the money. Cruise it until it blows and meanwhile save for an LS1. No offense but even if it is a 350 it isn't anything spectacular by today's standards.
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Old 03-03-2010, 09:05 AM   #18
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Quote:
Originally Posted by TheSilverOne View Post
305 is a boat anchor
Classic...

Atleast it's still a V8... I wouldn't go as far as to say it's a boat anchor though...

I had a 283ci small block Chevy in years past and that little V8 had more torque then the 327ci, 350ci motors I've also had in the past.. Quicker to rev too.. Size helps but isn't everything in some cases..

Now A Honda four banger would make for a nice boat anchor, no?
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Old 03-03-2010, 12:06 PM   #19
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Quote:
Originally Posted by JIBBBY View Post
Classic...

Atleast it's still a V8... I wouldn't go as far as to say it's a boat anchor though...
+1 - definitely not a boat anchor. The 305 isn't a bad motor, its just completely overshadowed because the 350 is a better motor, with almost no drawback, and some definite advantages over the 305. Like somebody said, at $500 305 or 350 don't matter much, I'd be more concerned that the car has a transmission issue, serious rot, other issues. If everything checks out and its a legitimate deal, 305 vs. 350 isn't a make or break, not at that price.
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Old 03-03-2010, 01:22 PM   #20
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Quote:
Originally Posted by Marc 85Z28 View Post
You'll need a small flashlight, a small mirror on an extendable rod, and a flexible neck

The numbers you need will be located on the back of the block, between the transmission bellhousing and the cylinder head. Of couse, that will only tell you what block it has, and not what the rest of the engine consists of.

If it's got a "new" engine and he only wants $500 for it, you're buying a nightmare!
silly putty works good if ther isn't a thick layer of grime on those numbers, otherwise its a PITA to actually get a good look at the #'s.
regardless of whats in it $500 aint a bad deal at all if the body looks good. a 305 does the job but if you want to mod the motor its a huge waste of money to mod one. like some one said get an LS1 + tranny for it and you've got a fast car for ~$1500?
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