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350 swap question

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Old Sep 19, 2012 | 08:58 PM
  #1  
cjberquist88's Avatar
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
350 swap question

so as of now i have an 88 305 tpi with a t5 , i been looking at 350's all over and have been wondering should i stick with tpi or go with carb or the vortec fuel injection??? i plan on having the engine on the stand for a while and building it as much as i possibly can with my budget... aggressive cam, head work, crank, etc the normal .. i wont be blowing it maybe turbo but not planning on it as of now... so question
1.what fuel delivery is best
2. are all years of 350's gunna put out around same power

thanks in advanced, im extremely ready to turn this 305 dog into a power horse
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Old Sep 20, 2012 | 07:32 PM
  #2  
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

i found a 350 tbi ( out of a 1987 k5) for 200$ , it runs but needs rebuilt which is what i wanted... so can i put my heads, and full tpi system on this engine? if so can i have the heads machined and put a medium/aggressive cam in it with the 305 heads?.... any input would be super helpful thanks
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Old Sep 20, 2012 | 07:52 PM
  #3  
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From: Hermann, MISSOURI
Car: 1986 Iroc-z Camaro t-top
Engine: 355 SBC
Transmission: 700r4 TCI const. Pres. Valve body
Axle/Gears: 3.73 posi/mosuer axles
Re: 350 swap question

Why are you wanting to run your 305 heads? If you swap everything from your 305 to a 350 it's going to run like **** without tuning it, tpi is junk regardless of what anybody else will tell you. Stick a air gap with a 600 Holley on it or depending on w
What your doing with it. If you put vortec heads on your small block and an air gap on that, I don't really think you can beat performance as far as budget goes. But things that you can not do if you build a tpi. Don't put a higher stall converter in it, and don't put a big duration camshaft in it. It is a very low rpm band motor, and honestly without a lot of work, the 350 tpi system won't perform much better at all vs. the 305. If this is a daily driver and your sticking with tpi different story, just get a tune on it and send it down the road, but if your just daily driving it, I would stick with the 305
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Old Sep 20, 2012 | 09:08 PM
  #4  
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

hmm ok so i should convert to carb?... i dont wanna drive it everyday but i dont wanna not drive it do to idling issues or 4 mpg, in other words its going to to be a drag car. so what kind of cam can vortecs handle being stock, anything good or just mild? should i keep stock pistons and rods or should i go through and change EVERYTHING? i dont want to half *** it but i dont want to spend 6 grand either
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Old Sep 20, 2012 | 09:13 PM
  #5  
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

http://www.ebay.com/itm/SBC-Chevy-35...5cb33b&vxp=mtr................... opinions on this kit??
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Old Sep 21, 2012 | 12:29 AM
  #6  
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From: Hermann, MISSOURI
Car: 1986 Iroc-z Camaro t-top
Engine: 355 SBC
Transmission: 700r4 TCI const. Pres. Valve body
Axle/Gears: 3.73 posi/mosuer axles
Re: 350 swap question

yes convert to carb it will save you headache and time and money and all that nonsense. you wont hardly tell a difference in gas mileage.i bet if you checked craigslist or the classifieds on here youll come across some cheap manifolds and carburetors and inginition products pretty cheap. if your building a drag race car your not worried about mpg. as far as what vortecs can handle, you need to pull the stud mounts out of the head and tap them for a 3/8 screw in stud or take it to a cylinder head guy to do that and theres nothing it cant handle for what your doing. also have the vortech heads machined for false seats, get you a good 45 degree valve job on it. im sure youd be fine with the stock crank and rods but why not go through and have some arp bolts in the rods and mains, that will have to be done by a machinist so they can hone it all. i cant tell you anything about that kit, just get with your local machinist im sure he can build a budget motor good enough for what your looking for without spending a hole lot of dough. this is obviously something your not going to want to tackle with no experience and/or equipment. if you miss any small step in building an engine, it could be catastrophic
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Old Sep 21, 2012 | 07:58 AM
  #7  
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

I just read my last post and was I meant to say was its NOT going to be a drag car. I wanna be able to hop in and drive it sometime on the weekend to the coast or dinner etc...thanks on the infoill try an Hook up with a known machinist in my area
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Old Sep 25, 2012 | 02:20 PM
  #8  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
If it's a driver, keep the TPI. Your 305 heads are better than the LO5 heads, but if you aren't going nuts, even the LO5 heads will work fine with TPI. The TPI heads would do better with 1.94" intake valves and some bowl work on a 350, but it's not necessary. Remember the 305 heads have 58cc chambers, and 350 64cc, so if you do use the 305 heads, use dished pistons so the final compression ratio isn't sky-high.

The kit you linked is not the right one for your engine.
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Old Sep 25, 2012 | 02:44 PM
  #9  
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

well i got eveything off the motor except the crank and cam , it will be off today.. but i decided to bore and stroke and build it to a 383 with carb. i have a machine shop picked out im gunna go talk to this week to finalize my decision with his company for all the machining ... any suggestions on brands for pistons, rods, crank hell any of the internals feel free to post them it will be a little while until i buy them because im on budget so i have to save money but i dont want **** parts
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Old Sep 25, 2012 | 03:17 PM
  #10  
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From: Midwest Indiana
Car: '91 RS / '17 FiST
Engine: Internal cumbustion
Transmission: 1 with a fun pedal and 1 without
Axle/Gears: 4th gen ss
Re: 350 swap question

Originally Posted by cjberquist88
well i got eveything off the motor except the crank and cam , it will be off today.. but i decided to bore and stroke and build it to a 383 with carb. i have a machine shop picked out im gunna go talk to this week to finalize my decision with his company for all the machining ... any suggestions on brands for pistons, rods, crank hell any of the internals feel free to post them it will be a little while until i buy them because im on budget so i have to save money but i dont want **** parts
If you're on a tight budget I would steer clear of the 383. Stroker parts were significantly more costly than I could afford on my budget.

I got a good set of Eagle rods for ~$215 and Speed Pro/Sealed Power flat tops with Mahle rings for $100 for my 350. Reused a crank that was turned 10 under. Splurged on bearings, but that was just a personal preference.
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Old Sep 25, 2012 | 10:15 PM
  #11  
cjberquist88's Avatar
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

Lol yaaaaa I was just looking at that. This is gunna be a long build so overall budget isnt an issue but I was thinking I can keep the block stock and put half the price of a 383 in it and be more than happy. What are some good hp numbers I can expect with a good size cam , ported and shaved vortecs , good intake and carb
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Old Sep 25, 2012 | 11:13 PM
  #12  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
More than the T5 can handle.
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Old Sep 25, 2012 | 11:20 PM
  #13  
cjberquist88's Avatar
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From: Portland, or
Car: 1988 iroc z
Engine: 5.0 tpi
Transmission: 5 spd manual
Re: 350 swap question

So can I rebuild with better parts or go with t56
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Old Sep 26, 2012 | 11:37 AM
  #14  
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From: Hermann, MISSOURI
Car: 1986 Iroc-z Camaro t-top
Engine: 355 SBC
Transmission: 700r4 TCI const. Pres. Valve body
Axle/Gears: 3.73 posi/mosuer axles
Re: 350 swap question

Overall hp numbers aren't going to be any better than a 350. Expect 450 with some port work. Use scat forged I beam 5.7 rods and a set of srp pistons with the compression height for a 383 and a scat 3.75 crank would be plenty for what your doing
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