Hello, iam getting ready to purchase a pair of 18 Degree heads for my 400 sbc. This will be a 11.5 comp motor with a solid roller cam going in my 67 chevy 2. The car went 10.90s on pump gas last year and i sold the motor to a freind. Dart, BMF, and Brodix are who iam looking at. Brodix sells a 18 degree sp and std (Spred port, Standard port) exuast, the standard port will allow me to use my exsisting header while the Brodix SP, BMF and Dart will need custom headers. Has anyone used the Brodix 18 STD, BMF or Dart 18?
If so what can i expect going to the 18 Degree heads?