Old Nov 11, 2019 | 03:50 PM
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GT3Fed
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From: Orange County, CA
Default Beginning efforts to bring a 1990 Sierra RS Cos 4X4 to Group N Spec

Hi All,

I've recently imported the aforementioned to the US, SoCal specifically. The car, a LHD model, appears to my current level of investigation rust-free with 41k kilometers and records show many details related to provenance. It has been a street car and has some investments in engine tuning that will documented when I have a chance to put in on 4WD dyno. Several questions for the group.
1. As Montune US is nearby and will undertake a rebuild to achieve varying outputs the issue is that the 200 block, as I understand it, can be brought to varying levels of tune. I would ask whether a bullet proof 400 bhp is possible? If so, I would appreciate recommendations regarding build bits.
2. Welding: The Group N specs allow a limited amount of welding. What structural changes beyond welding are recommended?
3. Wheels and tires: Currently, stock wheels are carrying 205/50/15 R rubber. What wheel type/tire would be recommend to comport with the Group N standard?

Would appreciate any other inputs and recommendations.

Howard
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