RE: Yellow Aircraft P-40 Engine?
Chris,
The stacks are the same as far as I know. The difference is the mounting of the cross-over manifold and header. Kelvin will send you some wood to mock up your setup, and will make the components from your mock up. His duplication of my mock up dropped right in, and was powder coated.
The attached picture illustrates the mock up.
Good luck.
Regards
Craig