Crank sprockets are made from billet SAE-1144 steel and induction heat treated. All other sets have three keyway setting points to ensure accurate timing selection for early or late-model vehicles. You can crack the hardened links and pins and cause early failures.
This set compaired to the stock or other factory replacement timeing sets is like the difference between Harbor Freight and Snap-On in quality but not in price . For a few dollars more than an OEM part Edellbrock provides a full roller chain with billit forged steel sprockets which are sure to run smoother ,longer ,quieter and gives the option of 2 advance or retard timeing srt ups besides the TDC set up.
This is a nice upgrade to a performance engine rebuild. You will need the 1 piece fuel pump eccentric if your using mech. fuel pump,2 piece eccentric not compatible with this performance timing chain set.