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Old 11-10-2008, 07:02 AM   #1
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Default Help/305 to 350 TPI swap

I am swapping out my 305 Tuned Port motor for a 350 out of a van of the same year(1987). What should i know about swapping from 305 to 350 Tuned Port. I'm pretty sure i need injectors, knock sensor and chip, but what else should i change. Also how big of a cam can you stick in a Tuned Port motor and how big of a cam can my 700r4 stand. I want to put heads and cam in the engine first then drop it in the car. I want to get the biggest cam i can (love the sound) but still not harm anything. Thanks ahead please help
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Old 11-10-2008, 09:24 AM   #2
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Try www.thirdgen.org. You will have better responses.
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Old 11-10-2008, 09:41 AM   #3
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I'm on the superfast internet connection at my school right now and they blocked the thirdgen.org site. The school's internet is literally incredible. I spend 5-6 period on this site everyday between 10:38 and 12:50.
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Old 11-10-2008, 10:12 AM   #4
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the sawp should be preaty easy. the 350 will slide right back in where the 305 was. if you go with a bigger cam i have always had very good luck with comp cams. they will tune you pcm or send you a chip to adjust the pcm. if you do the swap you will need bigger injectrs. try to find a vette so you can grab the pcm and intake or just injectors to get the car running before you cam it. o and i foregot, you can stroke thos to a 396, and when you do the swap do headders at the same time. youll thank me later.
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Old 11-10-2008, 10:58 AM   #5
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I've been thinkin of getting Accel 23lb/hr or 24lb/hr Injectors and I've already got all the Tuned Port stuff (Intake plenum, Rails, new fuel pump, etc) I was thinkin either a Comp or Lunati Cam and getting the stock heads port and polished. I have the 305 TPI that was stock in my Camaro still in it and still running fine but I'm most worried about running into electrical, computer, or some kind of sensor problems. I also have shorty headers I'll install with the 350. At what point does a larger cam become too large for my built 700r4 to handle? thanks
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Old 11-10-2008, 12:15 PM   #6
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you now the tranny can take alote as long as its built. just depends on how you drive it. that 1987 350 should be throttle body fuel injection. if you want to pump more power out of the 350, put your 305 heads on it. it will bump up the compression, and dont do a poilish. just port them. if you polish the combustion chambers, it can cause a loss in power in street engines. as far as fuel injectors go take the amout of horsepower and divide it by 16. exaple 400hp/16 = 25. that means you need atleast if not more 25lbs injectors. you should not run into electrical problems, most bexcept for 2 sensers are in the heads and intake. you should be able to work all of that out when you install.
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Old 11-10-2008, 06:06 PM   #7
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I still have the stock injectors out of my 87 GTA with a 350 TPI. If you need them you can have them for the price of shipping. Prob. like $10 But sounds like it will need more fuel than that..
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Old 11-10-2008, 07:49 PM   #8
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Quote:
Originally Posted by ERVNZ28 View Post
I am swapping out my 305 Tuned Port motor for a 350 out of a van of the same year(1987). What should i know about swapping from 305 to 350 Tuned Port. I'm pretty sure i need injectors, knock sensor and chip, but what else should i change. Also how big of a cam can you stick in a Tuned Port motor and how big of a cam can my 700r4 stand. I want to put heads and cam in the engine first then drop it in the car. I want to get the biggest cam i can (love the sound) but still not harm anything. Thanks ahead please help
When I had an 87 irocz, i had a 350 and added heads, cam, intake, runners, injectors(24lb) new throttle body. I left the computer, the 24lb/hr turned out great. I only prly made 350-375 hp tho. My stock 700r4 went within a month or so, i had it rebuilt and it did ok after that(just dont down shift) Its not so much the size of your cam is the torque that kills the tranny. I went with a 208/221 (WAY TOO SMALL). I remember reading an article of like a 224/230. Thatd be more like it.
My one recommendation (do not build up a tpi) way too restrictive. Take that money and buy new 190cc eliminator afr cnc'd heads, a big cam (23x/24x) cam, victor jr intake, 383 if you have the money, 1-7/8 headers and come out WAAAAY ahead of a tpi. I ran 13.8@100 with a built tpi.
Do what you want but if i could do it again id go with a carb setup for the same money with good heads and be a good 100hp ahead.

Good luck.
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Old 11-10-2008, 09:57 PM   #9
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^ 1 up for that. go carb and feel the power.
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Old 11-11-2008, 05:45 AM   #10
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Quote:
Originally Posted by ERVNZ28 View Post
I am swapping out my 305 Tuned Port motor for a 350 out of a van of the same year(1987). What should i know about swapping from 305 to 350 Tuned Port. I'm pretty sure i need injectors, knock sensor and chip, but what else should i change. Also how big of a cam can you stick in a Tuned Port motor and how big of a cam can my 700r4 stand. I want to put heads and cam in the engine first then drop it in the car. I want to get the biggest cam i can (love the sound) but still not harm anything. Thanks ahead please help
Be careful of which parts you mix. I think the 87 & up TPI motors all had roller cam (center bolt valve covers). But the trucks and vans of those years did not. Not until a lot later did the trucks and vans go roller. Just something to watch out for.
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Old 01-15-2010, 08:22 PM   #11
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I had a 89 Formula 350 and did alot to it over the years. LIke said you will need either the factory 22lb injectors the 350 TPI cars used or a set of replacement 24lb injectors.

Most people didnt know that the TPI system was designed and based on a 305 engine, it was never designed to be a 350, GM decided down the road to swap the TPI system over which is why there is very little difference in the actual TPI system.

You will need the appropriate year EPROM chip for a 350 TPI setup. 87-89 were all mass air flow systems, the 90-92 cars did not use a MAF and were speed density. Ed Wright at Fastchips was the man in the day for TPI tuning, he knows his stuff on the tuning part.

Like said also, the TPI motors were all roller cam motors with center bolt heads. I would make sure the replacement 350 is a roller motor and has center bolt heads as well so that you can swap most of your parts over onto the new motor.

3rdgen.org is a great site if you can eventually get on it. Lots of info on that site.
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Old 01-16-2010, 08:54 AM   #12
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Quote:
Originally Posted by Sneakyws6 View Post
I had a 89 Formula 350 and did alot to it over the years. LIke said you will need either the factory 22lb injectors the 350 TPI cars used or a set of replacement 24lb injectors.

Most people didnt know that the TPI system was designed and based on a 305 engine, it was never designed to be a 350, GM decided down the road to swap the TPI system over which is why there is very little difference in the actual TPI system.

You will need the appropriate year EPROM chip for a 350 TPI setup. 87-89 were all mass air flow systems, the 90-92 cars did not use a MAF and were speed density. Ed Wright at Fastchips was the man in the day for TPI tuning, he knows his stuff on the tuning part.

Like said also, the TPI motors were all roller cam motors with center bolt heads. I would make sure the replacement 350 is a roller motor and has center bolt heads as well so that you can swap most of your parts over onto the new motor.

3rdgen.org is a great site if you can eventually get on it. Lots of info on that site.
I'm sure he figured all that out by now
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Old 01-16-2010, 01:24 PM   #13
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Check out www.tpis.com. I have a 92 z28 with their zz409 cam and their AFR cnc ported 187 cc runner heads in a 355 with the Holley Stealth Ram intake with Holley 24 lb injectors with a stage 5 chip from tpis. 2800 stall and 3.42 gear it has gone 11.83 full weight on the motor. Pm me if you need some help or info.
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Old 01-16-2010, 01:24 PM
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305, 350, carb, carburetor, dragstrip, injection, instructions, knock, port, sensor, stroke, swap, tpi, tuned, wrong


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