The 73 has a 460 and integral PS. Tires(35 inch) just barely kiss the headers at full lock to the right. Left is not an issue. I used a Borgeson on that truck and clears fine but I never noticed how close it is. I used L&L perches as per a conversation with L&L. Their headers were designed to work with L&L perches.
Inner fenders had to be trimmed.
79 has a 390 (MadDog) and I modified the 351 perches to fit the different block.
I had to trim a very small amount from the driver side cab support. This was for my own piece of mind. It wasn't hitting.
One thing,I did have to elongate a few holes on the passenger side to get them to start. I had them coated beforehand so that might have had something to do with that problem. They were off a smidge.
I believe MadDog is better known for HD headers but he clearly has more than a few for automotive uses.
I'm pretty sure the U joint in the steering shaft is a problem. Even though my perches were modified the size of the tubes are going to be a problem with a stocker. I dropped the 2 bolts out of the interior side and put in 1/2 spacers and the stock shaft clears but I'm not satisfied and will probably switch to a Borgeson in the future. It makes for a real stupid looking gap between the column and dash.
Inner fenders have to be trimmed.
This truck has 37's but I have not driven it yet so I don't know about tires hitting.
I don't think either company is a simple bolt in...your gonna have to modify something.
"your gonna have to modify something". There it is I knew it was coming,as long as it is not the power steering unit please.....thanks grinner I knew you had the experience on the ? asked I was wondering about the shock towers but now i see......Grinner are your cab bushings stock size on pure insanity?
I have not got either truck into any off camber or twisted situations yet so I can't make a comment on the tires hitting the headers but you could possibly adjust the steering stops so that won't happen. It will change your turning radius though.
I'm sure someone here has experience with that situation. Maybe the guys in the 4X4 section could help?
Regarding the u joint....I think that even with the Borgeson unit itsa gonna be a tight one.
Hey grinner! Those look like a close fit. I have a stock highboy with 35's and the same steering shaft from borgeson. 445 stroker but in the factory 360/390 mounts. Think those headers will clear? Other then the fender skirts will I have to trim anything else?