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Woodfin · 12-19-2023, 12:27 PM

Racers,

I have heard the stories of running a BBC rectangular manifold on an oval port head, which is a huge mismatch. The stories relate how such a mismatch ran well.

My situation is an LS3 head with a CDI intake that fits fine except the roof of the port. The port is about .080" smaller than the intake, at the top only. The engine is assembled except for the intake. If necessary, I can tape up and slightly the relive the top of the port.

My question: do I need to relive the top of the port, or is it wasted time?

12-19-2023, 12:27 PM	#1
Woodfin Senior Member Join Date: Sep 2006 Location: Kilgore TX Posts: 538 Likes: 8 Liked 276 Times in 106 Posts	head to intake mismatch Racers, I have heard the stories of running a BBC rectangular manifold on an oval port head, which is a huge mismatch. The stories relate how such a mismatch ran well. My situation is an LS3 head with a CDI intake that fits fine except the roof of the port. The port is about .080" smaller than the intake, at the top only. The engine is assembled except for the intake. If necessary, I can tape up and slightly the relive the top of the port. My question: do I need to relive the top of the port, or is it wasted time?