Will ARP Stainless Steel Header Bolts 400-1210 fit my 2001 Ram? My quick conversation says yes, but I want to be sure.

 

Cant find anything online that specifies applications. I recommend you pull out one of the OEM bolts or one of the bolts on your new headers, run down to your local hardware store and test out the thread pattern on some of the nuts. If they fit a 3/8-16 in, then the ARPs will fit.

 

I did the conversion in my head they are M8x1.25x45mm

 

The exhaust manifold bolt size should be 5/16" x 18 for the magnum and LA small block motors. I used 1" long grade 8 bolts I picked up from the folks at Pacesetter headers several years ago to bolt on my coated JBA shorty headers. 3/8" x 16 bolts are used on big block Chrysler motors (383, 400, 440).

 

Good to know thanks man! I thought about using grade 8 bolts

 

Not necessary. That, and you don't really want them TOO hard. Grade 5 is fine, and allows them to 'flex' a bit when they heat/cool. So good locking header bolts, and REALLY good gaskets (remflex), and you won't have to worry about them.

 

You have a point there! I'll have to order everything and make sure it gets here by Wednesday

 

Don't use bolts at all, Replace them all with studs and use stainless flange nuts. Grade 5 will snap in a heart beat compared to a stud or grade 8 bolt.

 

Studs are certainly preferred for use where clearance issues won't prohibit their use, especially when headers are being used.

 

Studs don't look as pleasing as SS bolts