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70' LT1 exhaust dia.

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Old Oct 30, 2002 | 01:02 AM
  #1  
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From: nova scotia canada
Default 70' LT1 exhaust dia.

Was wondering if the 70' LT1 vette came with 2.5 in. exhaust.If in fact
it did was there a clearance problem when the pipes went through
the holes in the crossmember?My muffler shop recommended 2.25 in.
pipe, saying that 2.5 in. were too large for the crossmember and would
vibarate under load.
thanx wade
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Old Oct 30, 2002 | 01:44 AM
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Default Re: 70' LT1 exhaust dia. (wadey)

70-72 LT-1 cars should have had 2.5" exhaust from the factory. I have a 2.5" chambered exhaust on my '72 LT-1 and it's routed through the crossmember holes with no issues.
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Old Oct 30, 2002 | 01:49 AM
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Default Re: 70' LT1 exhaust dia. (wadey)

Hi Wade.
I have a 350/350 '70 and my brother just came back from Novia Scotia on vacation...that makes us.. like...brothers or something. Seriously, I don't know the answer but an old friend of mine has a '72 LT1. I'm not sure if it's the same design but I could ask him if he knows (I just got to find him). Send me an email if you get no response.
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Old Oct 30, 2002 | 08:46 AM
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Default Re: 70' LT1 exhaust dia. (wadey)

Wade, My 72' LT1 has 2.5 exhaust and as far as I know thats the way it came from the factory.
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Old Oct 30, 2002 | 04:08 PM
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Default Re: 70' LT1 exhaust dia. (mpro72vette)

2 1/2 is no problem at all the LT1s came with 2 1/2. I have seen 3 inch go through the holes but it is a tight squeeze but can be done.
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Old Oct 30, 2002 | 08:18 PM
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Default Re: 70' LT1 exhaust dia. (Gordonm)

1970 LT-1 is 2 1/2 and fits well through the frame crossmember. I have NO ground clearance issues. It does reduce down to fit the factory exhaust tips, and does start smaller.
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