Sm Blk heads

Which LA heads? X/J types? Smaller 675 heads for 318's? Swirl ports? Wha t is of importance?

• The rocker system differences have been pointed out.
• Are you interested in compression ratio? Magnums are easier to us to get CR up.
• Interested in getting quench effect easily? Magnums are closed chamber types, so better to start with.
• Is flow the parameter of interest? This mentions some flow numbers for the Magnums:
  • Magnum 5.2 vs. 5.9 heads - Moparchat - Home of MOPAR enthusiasts worldwide!
  • Compare those numbers to the '915J stock' flows in the chart linked in post #7 which is the best flows of the stock LA heads, I do believe.