Moroso Header Bolt - 8 mm x 1.25 Thread - 25 mm Long - Hex Head - GM LS-Series (Set of 12) M591 They feature a 3/8" NPT

They feature a 3/8" NPT inlet fitting and a 1/8" pipe fitting with plug for a fuel pressure gauge

Mild to moderate interior tone

Main Bearing Set For Chevrolet 400

N/A or forced induction

Seamless 1/2" copper tubing expanded into aluminum cooling fins for maximum heat transfer

Moroso Header Bolt - 8 mm x 1.25 Thread - 25 mm Long - Hex Head - GM LS-Series (Set of 12) M591 They feature a 3/8" NPTProduct Description: Header Bolt 8 mm x 1. 25 Thread 25 mm Long Hex Head Steel Zinc Oxide GM LS Series Set of 12 Moroso Performance Products is one of the worlds most respected suppliers of automotive equipment for racing and street performance applications. Moroso manufactures over 4000 products, from oil pans and oiling systems, to ignition wire, ignition components, valve covers, fuel system equipment, air cleaners, hard core racing tools, chassis