Oval port intake question.
Thread Starter
Melting Slicks
Joined: Dec 2005
Posts: 2,441
Likes: 0
Oval port intake question.
Does anyone have a theory as to why the ports are different sizes on Big Block oval port intakes? Even the factory manifolds have different port sizing. My guess is that this is a way to compensate for different runner lengths.
Last edited by shafrs3; Feb 22, 2006 at 04:30 PM.
Drifting
Joined: May 2001
Posts: 1,651
Likes: 13
From: Holly MI
Somebody mentioned in another thread it could be done to help equalize fuel distribution to all cylinders. If that is the case, changing the size of the ports could negatively affect fuel distribution.
Ken
Ken
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
No secret here. The different port sizes are to fix air/fuel distribution issues on the big-blocks. The old power books even talk about 4 different jet sizes in the carb to help equalize mixture. Remember the big-block has short and long intake runners.
