Exhaust port matching

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Oct 18, 2025 | 10:19 AM

#21

Che70velle

ModSquad

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Joined: Jan 2012

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From: Dawsonville Ga.

Quote:

Originally Posted by SteveJewels

Appreciate the info. That was a concern. I am working with BES Bischoff. Handy link to Bischoff Racing Engines

They are about an hour or so drive so I can pick up the engine and drag it back to Dayton.

Much, much better! Keep us posted.

Dec 13, 2025 | 11:46 AM

#22

G8 Drew

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Joined: Oct 2025

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The fact the LS exhaust are “D” ports cuts down on reversion. A easy way to port the exhaust is smooth out the top of the port only. Since you have 1 3/4” headers you can’t do much. 1 7/8” leave more room around the port to support anti reversion.

Dec 13, 2025 | 08:21 PM

#23

SteveJewels

Thread Starter

Launching!

Joined: Sep 2008

Posts: 224

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From: Dayton, OH

Quote:

Originally Posted by G8 Drew

Since you have 1 3/4” headers you can’t do much.

Where did you get that idea? I have 2" headers.

Dec 14, 2025 | 08:23 AM

#24

G8 Drew

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Joined: Oct 2025

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My mistake . With 2” port away.

Dec 14, 2025 | 11:46 AM

#25

IGN-1A

TECH Enthusiast

Joined: Aug 2021

Posts: 507

Likes: 190

Fueling Cones

Jim Fueling Cones (RIP 2002) are the BEST method to lower Reversion.
He asked for my help, he required the BEST ignition system for his Dyno Testing (bench)

No more missfiring!
Lance

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