3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

Rebuild My 305 or Swap for Used 350

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Old Jun 5, 2007 | 06:50 AM
  #16  
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Originally Posted by reamo04
get an old 302 6 cylinder, do 3 - 2bbl carbs, and decent head work and be better than 90% of the v8s that are street driven
Not trying to be an ***, but is this a joke?
Old Jun 5, 2007 | 11:47 AM
  #17  
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Originally Posted by danziger
Not trying to be an ***, but is this a joke?
not at all, u can actually use those motors to make more power and torque than a lot of big blocks out there
theres a local guy with one in his nova II and he runs 9s on it and even has the rear tubbed for it.
Im actually planning on building one comming up this fall
Old Jun 5, 2007 | 11:03 PM
  #18  
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Originally Posted by TechCam97
I believe it was GM High Performance that had an article in their last issue on building a 375hp 305 motor on a budget. It's pretty interesting, I'm looking for a 305 project myself just because of that article!
Yeppers. There are actually quite a few articles that range anywhere from 300 hp, to 350hp, to 375hp like you said. I've posted them numerous times.

Originally Posted by reamo04
get an old 302 6 cylinder, do 3 - 2bbl carbs, and decent head work and be better than 90% of the v8s that are street driven
WTF are you talking about. A 300 inline six ford? A high-revving, rare 302 Chevy? WTF are you talking about?

Originally Posted by Juiced91Z
go 350, the 305 is crap, yes people have made lots of power and gone pretty fast with them, though the same parts (and cost) in a 350 will net more power, it just has more potential. You can take a 305 all the way up to 340 cubes if desired. But i would strongly recommend the 350 instead. For 1500 you're not going to get much more than a stock/stock rebuilt 350, so if i were you, just save you're money and build a motor on the side.
I spent 1200$ on a rebuild for my 305, plus the cost of tires, exhaust, sfc's etc, and my combo would take most LS1's. That's including a full rebuild too

Check out jegs.com they supplied me most everything.
Old Jun 6, 2007 | 12:39 AM
  #19  
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Originally Posted by 85_305

I spent 1200$ on a rebuild for my 305, plus the cost of tires, exhaust, sfc's etc, and my combo would take most LS1's. That's including a full rebuild too

Check out jegs.com they supplied me most everything.
Hmm 1200 for a full rebuild? and you're taking ls1's? got video? you'd need much more compression, bore, and stroke, then you'll need a good set of heads, and a decent cam and intake, and a carb to keep up to get you up to a ls1. so unless you're spraying nitrous..i dont believe a rebuilt 305 with stock heads (even ported) is taking anything making 300hp or more.
Old Jun 6, 2007 | 07:21 AM
  #20  
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Originally Posted by 85_305
I spent 1200$ on a rebuild for my 305, plus the cost of tires, exhaust, sfc's etc, and my combo would take most LS1's. That's including a full rebuild too


so you more than doubled your horsepower with just a full rebuild? Well damn, wish I would have kept my 305 now. Who needs an LT1 when I could have done that.



and whoever was talking about a 6 cylinder is out of their mind.

Last edited by 92LT1RS; Jun 6, 2007 at 07:25 AM.
Old Jun 6, 2007 | 04:25 PM
  #21  
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Originally Posted by Juiced91Z
Hmm 1200 for a full rebuild? and you're taking ls1's? got video? you'd need much more compression, bore, and stroke, then you'll need a good set of heads, and a decent cam and intake, and a carb to keep up to get you up to a ls1. so unless you're spraying nitrous..i dont believe a rebuilt 305 with stock heads (even ported) is taking anything making 300hp or more.
That must be an "EST." taking of most LS1's.
Old Jun 7, 2007 | 12:49 AM
  #22  
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Originally Posted by 94Z28WP
That must be an "EST." taking of most LS1's.
thats what i was thinking. that'll be the day when i see a stock head/intake rebuilt 305 with boltons run mid-low 13's
Old Jun 7, 2007 | 01:06 AM
  #23  
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Originally Posted by 85_305
Yeppers. There are actually quite a few articles that range anywhere from 300 hp, to 350hp, to 375hp like you said. I've posted them numerous times.



WTF are you talking about. A 300 inline six ford? A high-revving, rare 302 Chevy? WTF are you talking about?



I spent 1200$ on a rebuild for my 305, plus the cost of tires, exhaust, sfc's etc, and my combo would take most LS1's. That's including a full rebuild too

Check out jegs.com they supplied me most everything.

im talking about the 302 inline 6cylinder GMC found in the 1952-1960 army truck such as the m135 or m211
Old Jun 7, 2007 | 09:19 AM
  #24  
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Originally Posted by Juiced91Z
Hmm 1200 for a full rebuild? and you're taking ls1's? got video? you'd need much more compression, bore, and stroke, then you'll need a good set of heads, and a decent cam and intake, and a carb to keep up to get you up to a ls1. so unless you're spraying nitrous..i dont believe a rebuilt 305 with stock heads (even ported) is taking anything making 300hp or more.
Well yes it was fully rebuilt, but it had extensive head work, it was cammed, and EVERYTHING else was hi-perf, but it still only cost 1200$

Originally Posted by robvas
Of course it's the mexican laughing.

Originally Posted by 92LT1RS
so you more than doubled your horsepower with just a full rebuild? Well damn, wish I would have kept my 305 now. Who needs an LT1 when I could have done that.



and whoever was talking about a 6 cylinder is out of their mind.
Never said "JUST a full rebuild". Read above.

Originally Posted by Juiced91Z
thats what i was thinking. that'll be the day when i see a stock head/intake rebuilt 305 with boltons run mid-low 13's
Never said the intake and heads were stock.

Originally Posted by reamo04
im talking about the 302 inline 6cylinder GMC found in the 1952-1960 army truck such as the m135 or m211
Ya I found that thread in the lounge. Interesting stuff
Old Jun 7, 2007 | 01:04 PM
  #25  
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I have a crazy buddy whom I gave my old 305 to. He transformed a mustang to accept a small block chevy. He is in the middle of running his fuel system and turbo system. He is going to see how much boost a stock 305 can take, and see what kind of mph he can run at the track. BTW, he is running a stock TH400 trans and the 8.8 rear end.

All this is done for under what you are willing to spend grated i gave him the motor and he had the trans already.
Old Jun 8, 2007 | 12:15 AM
  #26  
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Originally Posted by 85_305
Well yes it was fully rebuilt, but it had extensive head work, it was cammed, and EVERYTHING else was hi-perf, but it still only cost 1200$

Never said the intake and heads were stock.
i'd like to see the parts list for all of the above for 1200 bucks, i have the stock 305 from my 91' and i'd like to see it take most ls1's. any video, dyno sheets, or time slips? i'd like to see them
Old Jun 8, 2007 | 09:37 PM
  #27  
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I've listed my build a few times. But if your that curious, look here
http://www.goingfaster.com/spo/325_h...chevrolet.html
http://www.hioutput.com/tech/343hp/343hp.html

But I used Jegs for a majority of my stuff.
Old Jun 12, 2007 | 03:03 PM
  #28  
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I am surprized (NOT!) with the age of these cars getting up there, that everybody is still chopping these things up, just for the extra HP. IF and I say IF your car is in really good condition you may consider keeping that 305, only to keep it a numbers matching car. That would bring you a much higher return in the future, from someone that wants a collector. If your car has been a beater (like 90% of these cars)then by all means drop in that 5.7. This is just my $.02 on the subject, I could be wrong.
Old Jun 15, 2007 | 02:07 PM
  #29  
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Originally Posted by IROC-T
I am surprized (NOT!) with the age of these cars getting up there, that everybody is still chopping these things up, just for the extra HP. IF and I say IF your car is in really good condition you may consider keeping that 305, only to keep it a numbers matching car. That would bring you a much higher return in the future, from someone that wants a collector. If your car has been a beater (like 90% of these cars)then by all means drop in that 5.7. This is just my $.02 on the subject, I could be wrong.


do you realize how many of these cars were built? they are worth ****. the only ones worth anything are the rarerest of the rare tha only a few were built. such as the Turbo Trans Ams or some of the Mecham cars. thats it. the rest of them, you're not going to get a "much higher return" on.
Old Jun 15, 2007 | 02:33 PM
  #30  
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Originally Posted by 92LT1RS
do you realize how many of these cars were built? they are worth ****. the only ones worth anything are the rarerest of the rare tha only a few were built. such as the Turbo Trans Ams or some of the Mecham cars. thats it. the rest of them, you're not going to get a "much higher return" on.

Yes I know that there were tons of these cars made,but like said MOST were beaten to death, and you have your salt belt relics, and all of the hopped-up hot rods that soooo many are building (not saying that's bad), and salvage yards would rather crush for scrap metal than keep inventory these are afew of the things that are rapidly taking these cars out of circulation,is all I'm saying. Just something to concider.



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