Fuel line install: Inside or outside the frame rail?
Fellow drag racers, hotrodders, and muscle car enthusiasts, I would like everyone's opinion, viewpoints, and even speculations on this topic. I'll be installing fuel lines in my 70 Chevelle soon. So please help me out.
This will be a street/strip application. More street, but I need it to also pass tech inspections at drag strips once in awhile too without hassles. My power level with this car is in the 800 HP neighborhood, so we definitely aren't talking a factory stock sized fuel line here, and I'm asking everyone politely to please let's not turn this into a debate on fuel line diameter requirements, because that isn't what I need.
I'm not sure what the NHRA rules are regarding fuel line placement.(I only have the 2006 book, and it seems they add new rules every single year) Do they specify if it has to be inside or outside the frame rails? And if they do not specify, then what are the pros and cons of either placement? FWIW, the car is already painted, and the body mounts where all replaced before the body was put back on the frame, and I haven't any intentions of taking the body back off of the frame to install the fuel lines. I've also boxed-in the left hand and right hand frame rails. So if I do place the line inside the frame, I'll need to snake it through. What are your thoughts? Pros and cons? Please help me with your input. Thankyou in advance. BTW, I'll also be installing a return line going back to the fuel cell. So if there aren't any specifics in the rules, I'll need to decide, if I'll want both feed and return lines inside the rail, both outside, or one in and one out.
70 Chevelle SS clone (632 CI powered).