Square port heads
Thread Starter
TECH Apprentice
Joined: Sep 2013
Posts: 355
Likes: 19
Square port heads The 5.3 I have now has the Cathedral port heads on it, I have a carb style Holley intake that is square port, which square port head should I look for for boost? I know the 317 and the 243 are cathedral port I'm pretty sure, mine are 862. Would it be best to just sell the intake and buy one to match the heads I have now? When I bought the intake and carb, I was told it was cathedral ports, otherwise I wouldn't have bought it.
Thread Starter
TECH Apprentice
Joined: Sep 2013
Posts: 355
Likes: 19
Got in touch with the guy I bought the intake from and he says that it will work with cathedral heads. Anyone have experience with these intakes? I've worked on a bunch of LS engines but this is my first attempt at doing anything performance wise.
