cast iron heads vs aluminum for stroked 340

WOW! ................thats like 8.4%............who knew.

I love my TTIs, and dual 3"pipes. I've never been sorry about that purchase. That system was installed in 99.They even woke up my winter motor; a 73LC-teener.The collectors are leaking now, at the merge point, but, to their credit, they did go through 3 or 4 winters on the teener.