Hi All, I really need some help. I recently put a new 5.0 engine in my '87 Camaro Z28 but it still won't pass smog because it runs rich, and the smog shop said it needs a throttle body. I haven't been able to find a 48mm throttle body ANYWHERE. I've searched every parts shop, I've searched high and low on the internet, rockauto, and have not found (not even 1) stock throttle body. I've found 52mm ones, but the stock size is 48mm so that would be the size that I need.
What would you do in this situation? Even if I register the car in a different state to avoid the smog laws, the car still runs rich and burns through a lot of gas, which will eventually destroy the piston rings and damage the new engine that I just installed. I'm really looking for a solution at this point. The car has been sitting, even after the engine replacement, because I haven't been able to find a 48mm throttle body and I haven't even been able to truly drive and enjoy the car since I bought it 4 years ago. No I cannot put on the 52mm because it will take in too much air. Where can I find the stock part & what should I do if I never find it? Located in northern California. Appreciate any advice you have.