question for somebody who knows.

does a truck have to have a rear exit roll bar to run the 1/8 mile? or can you run only a external roll bar with stock chassis? i tried to read the nhra rules but so much is un clear to me i cant make heads or tails of it. hate to sound like a dumb ass but i need to know. dont wanna haul my junk to da Bash n not be able to run , someone please enlighten me thanks Erv.

How fast will it be?

not sure, around 550/600 hp 512, c6 3500 stall, 3.73 gear, 27x10.x15 slick, around 3800 lbs, wanting to get in the high 7`s , i have a nos cheater system but not sure if im gonna use it

Not sure exactly what you mean...
If you are talking about the "B" bars in the rule book....yes, you need to have them.

rules says A new NHRA safety rule change for 1995 states that cars running between 10.00 and 10.99 must have a rollcage unless the car has an unaltered firewall, floorpan and body (except for wheeltubs). This means if you have a street car with a stock floorpan and firewall but have tubbed it for bigger tires, all you need is a five-point rollbar until the car runs quicker than 10.00. Of course, a rollcage is perfectly acceptable if you wish to install one. i did not want to cut holes in my truck for roll bar/cage, i wanted to do a .134 walled round tube roll bar in back of truck only but now i see if i want to run that fast i will need at least a 5 point cage so gonna have to cut holes in back for bars to go threw n at least one bar running forward past my shoulder, i think im clear on what i need to do now, i think
thanks Erv.

I've seen some very nice cages done were only the glass was cut or lexan was installed. I am thinking of one truck in particular that had the factory glass but has cut out room for the bars to go through and has some rubber pieces made that fill the gaps. Looks good. I don't have any pics and the truck is now a full tube deal.

If you fun no faster than a 7.70 in the 1/8 mile i don't think you would need one.That would equal about a 12.00 in the 1/4 mile.And i think 11.99 in the 1/4 mile and faster at a NHRA track you need a roll bar so i think a 7.70 or slower in the 1/8 mile would be okay IMO.

Later Mark.

Is the truck still a stock chassis with original floor pans and glass?

Later Mark.

Mark Miller wrote:If you fun no faster than a 7.70 in the 1/8 mile i don't think you would need one.That would equal about a 12.00 in the 1/4 mile.And i think 11.99 in the 1/4 mile and faster at a NHRA track you need a roll bar so i think a 7.70 or slower in the 1/8 mile would be okay IMO.

Later Mark.

I believe this is correct. Although, even though I was in the same category, I felt the need to install the cage anyway. For safety's sake. As far as I'm concerned, in this sport, one can NEVER be too safe.










Doug...

If you go by the NHRA book (yes) if you have a sfi cage then (no) But me i would run them to make the chassis more rigged. just my $.02

The SFI 25.5 book does have a reference to the rear support bars (& their OD & wall thickness) being required where the SFI books 25.1E, 25.2, & 25.4 don't. But then 25.5 is more toward OEM frame/uni-body, back-half & mini-tubed type cars with some amount of factory firewall/floor sections anyway. And 25.5 also dictates rear frame materials too where the SFI 25.1E/25.2/25.4 does not.

Mark Miller wrote:Is the truck still a stock chassis with original floor pans and glass?

Later Mark.

yes at this time truck is totally stock glass,floor pans,firewall,chassis n rust , but not much , thank for the input guy`s . im gonna do a 6 point i guess

No problem the rust makes it a little lighter works to your advantage for going faster.

Later Mark