Cast or Alum.heads for racing.

Time to find another machinist" Edelbrock heads cracking when installed on cast blocks" :scratch: i've been running them for 3 seasons not one issue with them,or any issues with others i know that are using them..W2 might be a better head but they weight more(in racing weight savings is everything) and you need to use special W2 rockers,W2 intake,W2 headers,not cheap at all,i'll take a set of properly preped Aluminum heads over cast any day..and Aluminum heads can be fixed if damaged...can't always say that for cast..