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3rd Generation Camaros 1982-1992 Camaros

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Old 07-19-2009, 11:18 PM   #1
menace2society
 
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305 VS. 350

Can someone please give a me quick rundown the difference's between the 305 and the 350? Late 80's to early 90's. What makes the 350 so much better for adding power/TQ?reliability issuse between the two? A friend of mine has a 91 firebird with the 305. He asked me what kind of mods he can do to it and I said, Plenty! I have some more info/Q's after I recieve a response to my question.

I'm not very familiar with these engines. I'm into the turbo dodges. cuz I'm poor. Haulin ass in sleeper cars I would love to help him with an f-body. I love these cars.
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Old 07-19-2009, 11:29 PM   #2
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we need more information. What type of 305. There were like a dozen different versions of it.

But generally, the 305 is not well esteemed. The 350 is much more modable, and makes power more reliable. There is much more aftermarket for the 350.

Its probably a 305 tpi if its a 91. the Fuel injection system is a real bottleneck. If i recall the throttle body is long arm, and so makes good torque, but doesnt make great hp as it doesnt do well at high rpms.

Its been a while since I had my 87 transam, so my memory may be off. Check out thirdgen.org for great info.
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Old 07-19-2009, 11:52 PM   #3
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I havn't seen the car yet. My friend doesn't know a whole lot about vehicles. He told me it's tbi. I believe he has this engine: L03 V8 1988-1992 5.0L 305cid TBI 170@4000 255@2400 Anyone know the Compression ratio?

I think he just wants to do a few mods to it and doesn't want to swap a 350 into it at this time. What are some free mods (besides the obvious) and cheap bolt ons he can do to it? Any junk yard parts that are interchangable? That will bolt up with no or little modifications needed? Any recommend exhaust size?
The LB9 305 TPI from 85-92 made 190-220 hp. Sounds to me these came in the trans am and irocs so, would be tough to find. Anyone know why the LB9 made more power than the TBI L03?

Thanks for the info diV6 !

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Old 07-20-2009, 12:16 AM   #4
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The 305 & the 350 have a aray of parts you can get for them, you can put out some sort of power out of the 305 but its easier to get your hands on the 350 & get parts for it cheaper than the 305.

the 305 also had less HP than the 350 thats for sure.
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Old 07-20-2009, 01:56 AM   #5
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once again, my memory is real fuzzy here. If i recall, the tbi system is a real dog. I think some people switched it out for a carb. Might want to look into that.

as far as exhaust- 3 inches is more than enough for the little 305. the exhaust manifolds, the cheap headers from the factory, are probably the main bottle neck, followed up by the y pipe.

thirdgens with the 305 (even the top end 305 with tpi) were not known for accelaration. the 5.0 mustangs killed them in acceleration. it took the 350 to keep up. However, where the third gen shone was in the twisties. The thirdgen actually handled better than the 4th gen (assuming similar mechanical condition). If he wanted to do some upgrades, i would look for for a ws6 transam in a junkyard, and get the springs, sway bars and what not and switch them in. the third gen ws6 handled like it was on rails, though the rid was stiff as hell.

Man, talking about this is making me miss my old 305 tpi ws6 trans am. That car made my senior year of high school so much fun.
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Old 07-20-2009, 01:59 AM   #6
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my stock 350 Iroc ate 5.0 mustangs for lunch at the track & pooped hondas lol.

even the newer ones, its going to be better now that its a 355 lol.
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Old 07-20-2009, 02:44 AM   #7
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Thanks for the info guys. I'll have to get back with him and tell him what I found out. As for right now, the trans is the issue. He'll be picking up a used 700R4 for $20 from someone he knows. In the past I told him he should swap to the manual but, it sounds like he just wants to drive it for his other car took a crap on him and needs something to drive right now. thirdgen.org has some awesome info in there. I'll keep you guys posted when there are plans. Thanks.

Yeah, it's gotta be doggy. 305 tbi auto. I would be able to take him with my 94 dodge shadow 5 sp 3.0 v6 We can't have a FWD mopar beat a firebird. Or, can we? *Evil Laugh* That just wouldn't be right.

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Old 07-20-2009, 03:18 AM   #8
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Quote:
Originally Posted by menace2society View Post
Thanks for the info guys. I'll have to get back with him and tell him what I found out. As for right now, the trans is the issue. He'll be picking up a used 700R4 for $20 from someone he knows. In the past I told him he should swap to the manual but, it sounds like he just wants to drive it for his other car took a crap on him and needs something to drive right now. thirdgen.org has some awesome info in there. I'll keep you guys posted when there are plans. Thanks.

Yeah, it's gotta be doggy. 305 tbi auto. I would be able to take him with my 94 dodge shadow 5 sp 3.0 v6 We can't have a FWD mopar beat a firebird. Or, can we? *Evil Laugh* That just wouldn't be right.
yea TGO has some good information I am over there under Krazzycowgirl lol.
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Old 07-20-2009, 06:47 AM   #9
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Yea TBI was junk. It wasn't so much the induction as Edelbrock makes a replacement intake that flows pretty good and you can upgrade to truck 454 injectors. The problem is the crappy heads and crappy cam that come in the 305. I remember years ago some famous head porter looking at the 305 TBI head casting and saying that nothing could be done with it, because it was so bad.

The 305 has a smaller piston bore than the 350. What this means is that if you install a big cam and a good set of heads, the valves will smash the deck because of the smaller bore of the 305. Thats the reason why the 305 has always been cast aside. 350's are everywhere and don't have the issue holding it back. Since big cams and big heads make power, the 305 got lost in the mix.
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Old 07-30-2009, 01:30 AM   #10
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Quote:
Originally Posted by Super83Z View Post
Yea TBI was junk. It wasn't so much the induction as Edelbrock makes a replacement intake that flows pretty good and you can upgrade to truck 454 injectors. The problem is the crappy heads and crappy cam that come in the 305. I remember years ago some famous head porter looking at the 305 TBI head casting and saying that nothing could be done with it, because it was so bad.

The 305 has a smaller piston bore than the 350. What this means is that if you install a big cam and a good set of heads, the valves will smash the deck because of the smaller bore of the 305. Thats the reason why the 305 has always been cast aside. 350's are everywhere and don't have the issue holding it back. Since big cams and big heads make power, the 305 got lost in the mix.
Also the small bore of the 305 kills flow and shrouds the valves. The 305 makes a great door stop, the 350 response so much better to mods. The 305 can be made to run well, I worked on the Hot Rod RS TBI 305 5 spd Camaro in 1989 with Traco racing and they got that thing to run HARD (I still think they gave it a 45 cubic inch tune up). For my money you will get a big percentage gain out of the 5.7 over the 5.0, whether it be a TBI, TPI, or Carb.
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