Join Date: Mar 2002
Location: Austin, TX, USA
Determine what reach you need. Reach is usually standard to the 1/8". Also determine the thread size. Most are 14mm. Then go to Champion spark plug's website and look through their listings. If you're running stock, then a stock heat range plug should work fine. Do you need a short insulator to clear headers? 5/8" hex is nice because it is a bit smaller and easier to get a tool on.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI