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The common wall is a 3/8 stud, But the other side yes and no sleeve...

I've been wondering about this - the splitting of the port on the floor to mimic the "split" on the roof around the valve guide. Just "helping" the air decide which way it's going to go around the valve guide. In particular how this might work on a 351C head.
 

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Some pics of the my new Slick Rick Prepped - 20's. Getting closer to final assembly. 598ci



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Chad, what's your experience with heart shaped chambers like above versus what I call kidney bean shaped chambers like below?

 

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Chad, what's your experience with heart shaped chambers like above versus what I call kidney bean shaped chambers like below?

I’m my experience those bathtubs kidney bean chambers much have a slower burn as they take a lot more timing and are much less sensitive to timing than tighter heart shapes. They also don’t tend to show their power on track as well as others
 

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The Tunnel Port pushrods tubes are not much or a restriction at all, the manifold widens around them so it's like an island in a river.

Those High Risers are the Dove heads? My stock iron ones are about 330 intake. They also have a better exhaust port than other FE heads.
 
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