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Old Aug 12, 2013 | 10:23 AM
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350 upgrades

What can I possibly do to my olds 350 to make it a nice tire screecher?? It was rebuilt 10k miles before I purchased the car. Its all stock.....I'm opinion to suggestions guys thanks!
Old Aug 12, 2013 | 10:30 AM
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A good timing curve. Maybe a stall converter for the trans the tci Saturday nigh special is a good choice imo. And forsure a rear gear swap if is lower than a 3.23. I would suggest a 3.42 for nice cruising at lower rpms . Some exhaust work a nice x pipe system and headers if you so chose to do so.

Last edited by coppercutlass; Aug 12, 2013 at 10:33 AM.
Old Aug 12, 2013 | 10:36 AM
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So 3.42 instead of 3.08?
Old Aug 12, 2013 | 10:38 AM
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I liked the 3.42 when I had it but if you already have a 3.08 on a rebuilt engine I think some fine tuning will get you to smoke those tires from a stand still. I don't mind the 3.73 but at highway speeds you will be higher rpms.
Old Aug 12, 2013 | 10:42 AM
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Thanks!! Imma look into that!
Old Aug 12, 2013 | 02:48 PM
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I had an all stock 69 442 with 456 gears and thats all it needed!!!LOL
Old Aug 12, 2013 | 07:40 PM
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So gears baically???
Old Aug 12, 2013 | 07:47 PM
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Originally Posted by TheNewGuy
So gears baically???
What about a mild cam? Headers? Nitro boosters hahaha jk
Old Aug 12, 2013 | 08:18 PM
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Yeah, that stuff works too.
Old Aug 12, 2013 | 08:30 PM
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The thing is you cant over gear a stock engine eventually you will run out of steam and the engine will be useless at certain rpm. For example I put a 307 in my 72 while I rebuilt my current 355. Now a 307 is nothing special. But I put all the running gear from my previous 350 on it., so the 650 holley double pumper, headers, xpipe exhaust, I bumped up the timing and I had a 2300 stall onverter and that litte 307 would smoke the tires with ease but in 3rd gear it was out of steam around 3800 rpm. I think on a stock engine 3.73 is about as high as you wanna go imo but that 3.73 gear will also work with a performance engine . A rear gear swap will be the biggest bang for the buck mod you will feel off the line. Unless you do some engine work. If you carefully pick items to pep your car up now and plan accordingly you can re use those parts down the road., then once you build a high perf. engine you will have a rear gear that will work with the cam for that hot engine and maybe a converter if you decide to go that route too.

Last edited by coppercutlass; Aug 12, 2013 at 08:35 PM.
Old Aug 12, 2013 | 08:33 PM
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Originally Posted by 70cutlass831guy
What about a mild cam? Headers? Nitro boosters hahaha jk
Mild cam, yes. Headers, nitrous, no. Unless you are going racing more than anything else.
Old Aug 12, 2013 | 08:56 PM
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Originally Posted by Charlie Jones
Mild cam, yes. Headers, nitrous, no. Unless you are going racing more than anything else.
I was joking about nitrous. I have a set of hooker headers on my cutlass. Nothing too aggressive. She's a decent runner. The sound is nice.
Old Aug 13, 2013 | 03:08 AM
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Originally Posted by coppercutlass
The thing is you cant over gear a stock engine eventually you will run out of steam and the engine will be useless at certain rpm. For example I put a 307 in my 72 while I rebuilt my current 355. Now a 307 is nothing special. But I put all the running gear from my previous 350 on it., so the 650 holley double pumper, headers, xpipe exhaust, I bumped up the timing and I had a 2300 stall onverter and that litte 307 would smoke the tires with ease but in 3rd gear it was out of steam around 3800 rpm. I think on a stock engine 3.73 is about as high as you wanna go imo but that 3.73 gear will also work with a performance engine . A rear gear swap will be the biggest bang for the buck mod you will feel off the line. Unless you do some engine work. If you carefully pick items to pep your car up now and plan accordingly you can re use those parts down the road., then once you build a high perf. engine you will have a rear gear that will work with the cam for that hot engine and maybe a converter if you decide to go that route too.
Yes I have also seen a 307 smoke it up with the right gears.......hmmmm.....thanks
Old Aug 13, 2013 | 03:09 AM
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Originally Posted by 70cutlass831guy
What about a mild cam? Headers? Nitro boosters hahaha jk
Intake, came, headers, roller rockers.......that's what im thinking
Old Aug 13, 2013 | 03:50 AM
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I have a new edelbrock 3711 intake never used and new in box hooker super comp headers that ill make u a great deal on. Also have Holley 650 DP that needs to be rebuilt. Gaskets, fuel line, filter and new bolts would be included.
Old Aug 13, 2013 | 07:01 AM
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How much for the headers ans intake
Old Aug 13, 2013 | 07:02 AM
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Think I need to research intakes next.....in conjunction with a quadrajet
Old Aug 13, 2013 | 09:47 AM
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$300. The headers new are 450. I have an ad in the parts section for everything.
Old Aug 13, 2013 | 10:50 AM
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First of all, is it a daily driver, if yes 3.42 gears, if no 3.70 or higher.

For me it would me:
- Posi
- Gears
- Headers
- Intake
In this order!
Old Aug 13, 2013 | 12:08 PM
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Nope.....just a weekend warrior.....so 3:73 would be good?
Old Aug 13, 2013 | 12:11 PM
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Oh and what if I wanna upgrade to the bigger 18s or 20s.....wouldnt I take that into consideration about the gears?
Old Aug 13, 2013 | 12:29 PM
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Originally Posted by TheNewGuy
Oh and what if I wanna upgrade to the bigger 18s or 20s.....wouldnt I take that into consideration about the gears?
Yes, you would. If you go to 18's or 20's then you should look into the 4 somethings . Like 4.30 or 4.56.
There are ways to mathematically determine the proper gear ratios when changing wheel sizes. If need be, I could post a dialog on how to figure it .

Last edited by Charlie Jones; Aug 13, 2013 at 12:37 PM. Reason: add text
Old Aug 13, 2013 | 01:36 PM
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It's the final tire diameter that matters, not wheel size. Think about how much highway driving you will do. With a 3.42 I run about 3000rpm at 65-70 (I have both 225/70/14's and 275/60/15's).

Also, I don't think you gave much info on the rebuild other than "stock" which can mean a lot of things. 2bbl or 4bbl? single or dual exhaust? May not know since done before you got it, but cam and compression ratio? Also assuming you have a TH350 trans.

4bbl, duals (headers optional), shift kit and a 3.42 rear end will make for a peppy 350 street car. Pretty much described my set up. Sky is the limit after that, along with the $$$ that go with it.
Old Aug 13, 2013 | 03:30 PM
  #24  
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Originally Posted by hookem horns
It's the final tire diameter that matters, not wheel size.
When I said wheel size I meant the diameter of the of the tire and wheel combination.
Changing 14 to 15 inch tires / wheels will probably not make too much difference.
Changing up to 18 or 20 inch wheels and tires will DEFINATELY require a change of rear end gears to make things right
Old Aug 13, 2013 | 04:04 PM
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Originally Posted by hookem horns

Also, I don't think you gave much info on the rebuild other than "stock" which can mean a lot of things. 2bbl or 4bbl? single or dual exhaust? May not know since done before you got it, but cam and compression ratio? Also assuming you have a TH350 trans.

4bbl, duals (headers optional), shift kit and a 3.42 rear end will make for a peppy 350 street car. Pretty much described my set up. Sky is the limit after that, along with the $$$ that go with it.

I heard that regular exhaust manifold were "ok" to keep.....but definitely something optional
Old Aug 13, 2013 | 09:45 PM
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i would start with gears 3.73's if its gonna see highway, if not 4:11's. add some timing to her. if you want more from there you can always change intake, carb, and headers from there
Old Aug 14, 2013 | 06:13 AM
  #27  
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Yea it will see the highway so 3:73 it is
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