Which is the correct size header bolt - ARP

[Gelf VXR]

Anyone know, there is a choice of flange and thread pitch? TIA


Chevrolet Gen III/LS Series small block, 1/4˝ wide flange
Header Bolt & Stud Kits

UHL (Qty: 12) 0.984˝
Thread Size M8˝
Wrenching 10mm
washers included

134-1101

Chevrolet Gen III/LS Series small block, 3/8˝ wide flange
Header Bolt & Stud Kits

UHL (Qty: 12) 1.181˝
Thread Size M8
Wrenching 10mm
washers included


134-1102


Chevrolet Gen III/LS Series small block, 1/4˝ wide flange
Header Bolt & Stud Kits

UHL (Qty: 12) 0.984˝
Thread Size M8˝
Wrenching 10mm
washers included


134-1201

[stevieturbo]

They just use normal M8x1.25 bolts.

ARP seem a total waste of money for that. IMO best bet is to make up some studs and use studs/nuts rather than bolts. Or just buy some stainless bolts.