Yes or no?
Race Director
Joined: Oct 2004
Posts: 12,860
Likes: 4,661
For an LS1, I recommend a 90mm LS2/silver blade TB, especially when running the C5 PCM. Here's why; Because I called Nick Williams and discussed, at length, whether to go with a 102mm TB on the built LS7 in my C5. He flat said it's not a good idea, and recommended against it. He said running the 102 on the C5 PCM is problematic, and it takes an exceptional tuner to get even decent driveability. Tony Mamo said the same thing. They also told me the 90mm TB flows 1,250cfm, which is a LOT!! From what info I've gathered, the 102mm on a 427 like mine would be worth-maybe-10hp maximum over the 90mm. I think if he went with a 102, the OP would gain zero over a 90mm at 350 cubes. YMMV......
Team Owner
Joined: Oct 1999
Posts: 31,976
Likes: 487
From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
For an LS1, I recommend a 90mm LS2/silver blade TB, especially when running the C5 PCM. Here's why; Because I called Nick Williams and discussed, at length, whether to go with a 102mm TB on the built LS7 in my C5. He flat said it's not a good idea, and recommended against it. He said running the 102 on the C5 PCM is problematic, and it takes an exceptional tuner to get even decent driveability. Tony Mamo said the same thing. They also told me the 90mm TB flows 1,250cfm, which is a LOT!! From what info I've gathered, the 102mm on a 427 like mine would be worth-maybe-10hp maximum over the 90mm. I think if he went with a 102, the OP would gain zero over a 90mm at 350 cubes. YMMV......
The 102 also requires shorter motor mounts or cut the cowl. The FAST92 does not.
Supporting Vendor
Joined: Sep 2004
Posts: 1,270
Likes: 1,210
Should be worth 20+ at the wheels
Recommend one of my ported FAST 92 intakes to avoid fitment issues with the cowl previously noted. And with the 92 you don't even have to replace the fuel rail either which is required with the 102. Also recommend a ported OEM 90mm GM TB
Excellent combo that provides more response as well. Coupled with the significant increase in power and torque it will do everything your hoping for
Feel free to reach out to me if you have any additional questions
Tony
(661)714-1317
