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1987 IROC swap to 6.2L LT1 with 10 speed auto

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Old May 10, 2026 | 05:48 PM
  #51  
Hypesquad2017's Avatar
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Re: 1987 IROC swap to 6.2L LT1 with 10 speed auto

What did you end up doing for the transmission lines?
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Old May 10, 2026 | 06:34 PM
  #52  
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From: Montgomery, TX north of Houston
Re: 1987 IROC swap to 6.2L LT1 with 10 speed auto

I think that those are very good times and the trap speeds are super consistent. I'd be very happy with those numbers especially with those DAs last night!
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Old May 10, 2026 | 06:58 PM
  #53  
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Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: 1987 IROC swap to 6.2L LT1 with 10 speed auto

Gosh, it seems so tame and docile and yet moves out. Nicely done!
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Old Yesterday | 10:33 AM
  #54  
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From: Phx, AZ
Re: 1987 IROC swap to 6.2L LT1 with 10 speed auto

Originally Posted by Hypesquad2017
What did you end up doing for the transmission lines?
I re-used part of the factory hard lines up front where it connects to the radiator and used an adapter to convert to AN once it got down by the oil pan, then built some soft lines that ran around the back and to the front of the trans. I might redo those in hard line all the way at some point in time but it's working and not a problem.

Last edited by NicD; Yesterday at 10:45 AM.
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Old Yesterday | 10:39 AM
  #55  
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From: Phx, AZ
Re: 1987 IROC swap to 6.2L LT1 with 10 speed auto

Originally Posted by dannyual320
I think that those are very good times and the trap speeds are super consistent. I'd be very happy with those numbers especially with those DAs last night!
I was hoping that once it cooled off I could get it down around 11.5 at 121-122 but I think that's going to have to wait for the winter time here in AZ. Our air is just not great at all compared to a lot of other areas in the country.

Originally Posted by QwkTrip
Gosh, it seems so tame and docile and yet moves out. Nicely done!
It really is pretty tame and is just super smooth, on the first pass I thought something was off because it just didn't feel like a mid 11 second pass. I fully expected a 13 second time slip and was trying to figure out what happened on the return road, but I'm used to mid 7 second passes in the 1/4 in the other car so I seriously thought something was wrong. LOL
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