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My 1970 Chevelle was built 01B and the heads are dated L-10-69 and L-11-69 and all articles I’ve read show as closed chamber and I think the conversation from closed to open happened end of 1969. I have included a picture of my heads and the combustion chamber. someone verify open or closed?
705333
705330
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705332
 

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What is the casting number of the head on the right of your picture? Cleanest best flowing head..
 

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Casting number, not the date. Is it an 049 head?
 

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1967 Chevy Chevelle
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It’s a stock photo he grabbed of the net showing chamber differences.
 

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1968 Malibu sport coupe, 489 ci. 590 hp 600 tq, RV T-400 Freakshow 3200 stall, 3.73 12 bolt posi
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Semi open and I believe same as "215" & "063" large oval 100.9 cc chamber, I liked the 063 set I had on a 454
 

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They are ”semi open” first step from bathtub closed to true open like the middle picture in your first post cc them I think they will be 105-109 cc.
 
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They are ”semi open” first step from bathtub closed to true open like the middle picture in your first post cc them I think they will be 105-109 cc.
This one. The in between heads. Not quite the closed chamber but not the open chamber design.
 
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