When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The spacer won't do anything an a 6er either. Once you have power on a V8 engine you can use them to massage the power band a bit. There are almost half a dozen different spacer times, open, divided, 4 hole, combination etc. Some with tapers, some without.