I have a '77 caddy hearse with a 425. i want to go with dual 2.5" pipes though Magna Flows out to the back with flame throwers. but I have no idea which headers to go with. it looks tighter on the passenger side than the drivers. I'd like tri-Ys but whatever best fits ill go with. thanks
Dead Sled......Welcome to the board!!
There aren't alot of choices in headers for these motors. Check with the vendors listed below........they might have something that will fit your car. Cad Company Maximum Torque Specialties (MTS)
They both have lots of good info on their sites.
The only "header manufacturer", that I know of, that mass produces a BB Cadillac header is Sanderson but I don't think they will work with your car.
ive seen adaptors to fit BBC headers to Cad heads. would this be an option? Clearance still concerns me though. I dont want to beat the tubes like a red headed step child to make them fit. I dont have the resources to buy and try a set of headers one by one till i find one that fits eiter. Thanks
Yep.....at least that I've heard about. Kinda sucks that there's not more options for parts and suppliers but I've heard good things about both of these suppliers.
ive seen adaptors to fit BBC headers to Cad heads. would this be an option?
yeah.......both the Cad Company and MTS carry header flanges for the Cadillac BB(you can find them on eBay to but I don't know the quality of those......just do a search on eBay for "Cadillac 500").
As far as I know, the 425 bolt pattern is the same as the 472/500(?).
I'm still not sure if I'm gunna go with headers in my truck or just use the stock manifolds.
Hope this info helps.
There is also Potters but there website is down I think for a revamp. I am told he recently sold off part of his business. He developed & marketed several parts for the big Cad including a tunnel ram intake, a crank scraper, some race grind cams, a girdle and is suppossedly developing a complete super charger system. Also there was/is an outfit called Rad Cad. If memory serves me they are associated with Air Ride Technologies or something. I believe they also sell some Cad parts and I think they developed the high end rebuildable fluid damper/balancer that MTS sells. Northern Automotive is a discount mail order place that sells complete rebuild kits for the Cad & has good prices. PAW & others sell rebuild kits but you have to know exactly what you want especially if you are doing something above a stock rebuild. Rocker Arm Specialties also builds a shaft rocker arm systems for the big Cads. I believe at least one of the two MTS markets is or is a derivative of a Rocker Arm specialties unit.
Sanderson or Potters have a website? i searched but with no luck.
looks like the rear dump shorties are going to be the only thing that will fit because of the offset of the engine between the frame rails. mabey when some one surprises me with a 472/500 i can re adjust the steering linkage and put the motor back where it should be. lol
my handy 'cad company by flashcraft' performance parts catalog shows block huggers for $349 or $499 for coated, and mid length for $449 or $575 coated. sanderson's price right now for blockhuggers is $285 and $435 coated, they don't have mid length. HTH
btw, im just about to order my blockhuggers, for $285 from sanderson, they make an AWESOME header