We race four NSS Hemi cars, two of them have these so called 'junk' MP Heads on them. Both run very well, no issue. In fact the last NSS event we raced we ran the Hemi Dart with those 'junk' heads on, and it went 5 rounds running 9.60s. Perhaps we should take them off and get rid of them. We've been racing Hemis for close to 50 years, and some how t hat got by us.....