1965 Z'd frame

[chopperkell]

I have a 1965 c10 long box that im converting to a short box. I decided to just build my own rear frame section. since im here I though I would z the frame up front so I can make it lay frame or at least close. My issue is I have 275/40r20 wheels and tire with 2 1/2 dropped spindles and lower A-arms with the bag mounts dropped. the frame sits about 3 1/2" frame the ground now. but looking at it with the wheels on when I go to Z the frame the back of the tire will hit the fire wall? I have not heard or seen anybody mention cutting the fire wall to clear tires?? Is there something im missing or is that what I need to do.

[chopperkell]

Anybody ????

[SCOTI]

Yes, taller tires will require clearance mods @ the firewall if the suspensions spindle centerline is unchanged from the factory. You could also do the Z-cut @ an angle to shift the spindle C/L forward (ex: up 3"; forward 1.5").

[chopperkell]

PERFECT!! thank you for the info. I was thinking of moving it forward just never heard or read of anybody doing that. Thanks again for the info.

[tinydb84]

I did my Z 4'' up and 1'' forward. Cleared the firewall with room to spare with 29'' tall tires. I have a 75 so it might be a bit different. If you have the body on it now I would take some measurements to see where you want your front wheel centerline to end up.

[chopperkell]

thanks!