I have a FAST 92 i've been running on my LS1 for the past few months. I am in the process of building a 402 with an LS3 top end. Obviously I need a Rectangular Port intake in order to run the heads. When I pulled my intake and looked at the ports I was a bit confused. Do these look Rectangular to you or is it just me? The inside of the ports themselves look rectangular to me... Click to view larger images.... Thanks in advance for all the input.

 

Cathedral without a doubt bud!

 

Thought so because of the shape of the orange seals. I just noticed the inner part wasnt shaped the same which is why is asked lol thanks!