LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

worth swapping 305tpi to 350 LT1?

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Old Jul 11, 2015 | 07:16 PM
  #1  
86z89iroc's Avatar
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From: Illinois
Car: 86 z28 daily, 2 89 iroc-z's
Engine: sbc's
worth swapping 305tpi to 350 LT1?

I have an 89 iroc-z 305 tpi with upgraded ignition true duals and slp .480 lift cam turbo 350 with small stall and 2.73 rear. Guy wants me to do side job on his 74 nova swapping a sbc to bbc and as payment would give me a LT1 with auto trans wiring harness computer even has fuel tank with pump for the swap. It's supposedly out of 95-97 z28. Would it be worth putting in my 89 as far as power and ecomomy? Was planning on putting the 700r4 back in it to be nicer on street before this came along.
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Old Jul 11, 2015 | 09:18 PM
  #2  
Zach/90\irocZ's Avatar
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From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: worth swapping 305tpi to 350 LT1?

Hell yes as long it's running condition throw cam in it and stall
They make more power due to intake and heads only bad thing is need to upgrade optispark

Do search and look on YouTube etc should explain a lot and should be easy decision to make
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Old Jul 11, 2015 | 10:31 PM
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Derekltz28's Avatar
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From: Wausau
Car: 87 Iroc z
Engine: Lt1 350
Re: worth swapping 305tpi to 350 LT1?

Done it worked out great opti is a pile tho
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Old Jul 12, 2015 | 08:52 AM
  #4  
86z89iroc's Avatar
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From: Illinois
Car: 86 z28 daily, 2 89 iroc-z's
Engine: sbc's
Re: worth swapping 305tpi to 350 LT1?

I thought about LT4 hot cam and ignition upgrade if I did it. Was thinking the only thing I know I would need is electric to mechanical box for speedo. Haven't done much research to see what else is needed.
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Old Jul 12, 2015 | 01:25 PM
  #5  
Zach/90\irocZ's Avatar
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From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: worth swapping 305tpi to 350 LT1?

Upgrading to msd I here fixs that issue but idk
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Old Jul 12, 2015 | 07:28 PM
  #6  
86z89iroc's Avatar
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From: Illinois
Car: 86 z28 daily, 2 89 iroc-z's
Engine: sbc's
Re: worth swapping 305tpi to 350 LT1?

How does cooling system work on LT1 to 3rd gen? Doesn't it have reverse flow?
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Old Jul 12, 2015 | 09:24 PM
  #7  
Zach/90\irocZ's Avatar
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From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: worth swapping 305tpi to 350 LT1?

Same as any it's just reverse flow need nothing special
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