Exhaust Manifold Bolts

[Beverley Grove]

Pack of five 3/8" x 1" bolts ARP bolts with 3/8" head from Tweeks £14.25 delivered.
There are really only 4 standard manifold bolts that you cannot get a ground ring spanner on and this is a lot cheaper than buying a pack of 16 stainless ones.
Extra bonus, being black steel, nordlock washers will bite into them.

[Grumbly]

They may be unplated, but the alloy is likely to be a good bit harder than a commercial grade stainless steel bolt.

[Beverley Grove]

The nordlocks definately bite better. You can see and also feel it when undoing again.

[Barreti]

These actually look better than the stainless ones which I've used with Nord Lock washers.

With the stainless ones there isn't a single mark on the head where the washer should have bitten in.
I'm in the process of swapping my stainless bolts out because I can't keep them tight.

[JamsD]

That is a bargain. Buying two packs is even cheaper than buying the eight pack which cost me around £38 + delivery.

[bobfather]

The ARP bolts above have a very hard surface, this is an issue with Nordlocks because the washers work by biting into the bolt flanges and the manifold. After many re-tightening efforts I removed my ARPs and used a centre punch and hammer to rough up the mating surfaces. This allowed the Nordlocks to bite on firmly. No more re-tightening for me any more