Been doing a few minor adjustments recently - making sure I will pass tech next season. I basically have everything with fluids on catch cans, all fuel lines now have shutoff valves and I built a firewall behind the seats, which meant I had to reinstall my action packer in a different orientation - the other side has an ARTEC fluid crate. I have also removed the massive Ford front brake calipers and taken apart the hubs as I am converting to Chevy 3/4ton calipers.
Counting the tube that the rear firewall is attached to on top it is about 2" higher than the top of the fuel cell. The rules only specify 2" higher if the fuel cell is higher than driver's shoulders, what is for sure is that a firewall is necessary. I speaks about it in 2.3.4.
There is an element of weight savings for switching but it's mostly a performance "upgrade". Even with a 3/4 ton MC my braking was only "adequate" and these should make things better. I had my prop valve set at an almost 90% bias to the front (I could lock up the front tires only at full braking) and I want to send more braking power to the rear for more even stopping but if I send more braking to the rear overall braking decreases. The Ford calipers where the original calipers from the axle and when I built it they were in so-so shape and as everyone knows are massive dual piston units. I am counting on the smaller single piston chevy calipers to give me better all round braking and the ability to send more braking to the rear end.