Several includeing me ran an 18 degree chevie intake on Arrington head and W7 engines. Once the 420 was out it went the other way around.

We had to cut and weld flanges because the chevie would not reach the ports. The 420 can be ported and drilled to fit a chevy and then make a valley pan. What is being done in the picture makes a neater job but is a lot of work.

Leon

Career best 8.02 @ 169 at 3050# and 10" tires small block power.